Who built the first electric generating machine in 1660?
a) Otto von Guericke
b) Benjamin Franklin
c) Luigi Galvani
d) H.C. Oersted
Answer: a) Otto von Guericke
What did Charles de Coulomb measure?
a) The amount of electricity and magnetism generated in a circuit
b) The properties of a Leyden jar
c) The strength of a magnetic field
d) The speed of an electric current
Answer: a) The amount of electricity and magnetism generated in a circuit
Who discovered that a magnetic field surrounds a current-carrying wire?
a) Otto von Guericke
b) H. C. Oersted
c) Luigi Galvani
d) Nikola Tesla
Answer: b) H. C. Oersted
What is a Leyden jar?
a) A type of electric generator
b) An electrical storage device
c) A device used to measure electric current
d) A device used to measure electric potential
Answer: b) An electrical storage device
Who suggested the existence of an electrical fluid?
a) Otto von Guericke
b) Benjamin Franklin
c) Luigi Galvani
d) H.C. Oersted
Answer: b) Benjamin Franklin
Who conceived the idea of sending coded messages over wires using electrical
impulses?
a) Otto von Guericke
b) Samuel Morse
c) Luigi Galvani
d) Nikola Tesla
Answer: b) Samuel Morse
Who invented the Leyden jar?
a) Ewald Georg von Kleist and Pieter van Musschenbroek
b) Otto von Guericke
c) Benjamin Franklin
d) Luigi Galvani
Answer: a) Ewald Georg von Kleist and Pieter van Musschenbroek
What is Morse Code?
a) A type of electrical storage device
b) A device used to measure electric current
c) A code of electrical impulses used to send messages over wires
d) A device used to generate electricity
Answer: c) A code of electrical impulses used to send messages over wires
What did Benjamin Franklin suggest about electric charge?
a) It is made up of two types of electric forces, attractive and repulsive
b) It is a type of magnetic force
c) It can be stored in a Leyden jar
d) It is generated by rubbing two materials together
Answer: a) It is made up of two types of electric forces, attractive and repulsive
Who built the first electric generating machine?
a) Otto von Guericke
b) Benjamin Franklin
c) Luigi Galvani
d) Nikola Tesla
Answer: a) Otto von Guericke
What did Luigi Galvani observe in 1786?
a) A magnetic field surrounding a current-carrying wire
b) The existence of an electrical fluid
c) A discharge of static electricity making a dead frog’s leg twitch
d) The ability to send coded messages over wires using electrical impulses
Answer: c) A discharge of static electricity making a dead frog’s leg twitch
What is a Leyden jar?
a) A device for storing electrical charge
b) An incandescent light bulb
c) A type of battery
d) A type of wire
Answer: a) A device for storing electrical charge
Who discovered that a magnetic field surrounds a current-carrying wire?
a) Benjamin Franklin
b) Luigi Galvani
c) H.C. Oersted
d) Samuel Morse
Answer: c) H.C. Oersted
Who suggested the existence of an electrical fluid and two types of electric
forces?
a) Otto von Guericke
b) Benjamin Franklin
c) Luigi Galvani
d) Nikola Tesla
Answer: b) Benjamin Franklin
What did Samuel Morse conceive the idea of in 1831?
a) Sending coded messages over wires using electrical impulses
b) Measuring the amount of electricity and magnetism generated in a circuit
c) Inventing an electric generator
d) Demonstrating the existence of an electrical fluid
Answer: a) Sending coded messages over wires using electrical impulses
Who observed that a discharge of static electricity made a dead frog’s leg twitch?
a) Otto von Guericke
b) Benjamin Franklin
c) Luigi Galvani
d) Nikola Tesla
Answer: c) Luigi Galvani
Who formulated Ohm's Law?
a) Otto von Guericke
b) Benjamin Franklin
c) Luigi Galvani
d) G. S. Ohm
Answer: d) G. S. Ohm
Who invented 3-phase power distribution, the alternating current motor, and
wireless transmission?
a) Thomas Edison
b) George Westinghouse
c) Nikola Tesla
d) H. C. Oersted
Answer: c) Nikola Tesla
What is the classical theory of electricity?
a) Electricity is tied to even smaller subatomic particles that possess either a
positive or negative electromagnetic charge.
b) Electrical current is electron flow.
c) The Law of Charges states that opposite charges attract each other and like
charges repel each other.
d) Energy can be added to an electron to move it to the next higher orbital shell.
Answer: b) Electrical current is electron flow.
What is the modern theory of electricity?
a) Electricity is tied to even smaller subatomic particles that possess either a
positive or negative electromagnetic charge.
b) Electrical current is electron flow.
c) The Law of Charges states that opposite charges attract each other and like
charges repel each other.
d) Energy can be added to an electron to move it to the next higher orbital shell.
Answer: a) Electricity is tied to even smaller subatomic particles that possess
either a positive or negative electromagnetic charge.
What is an electric current?
a) A flow of water through a conductor
b) A flow of air through a conductor
c) A flow of electric charge through a conductor
d) A flow of sound through a conductor
Answer: c) A flow of electric charge through a conductor
Which type of material carries electrical current without providing too much
resistance to current flow?
a) Insulator
b) Conductor
c) Semiconductor
d) All of the above
Answer: b) Conductor
What is the property of insulators that makes it difficult for electrons to move and
conduct electricity?
a) They have free electrons
b) They have electrons that tend to retain electrons on their original atoms
c) They have very high resistance
d) None of the above
Answer: b) They have electrons that tend to retain electrons on their original
atoms
What are materials that are neither good conductors nor good insulators called?
a) Conductors
b) Insulators
c) Semiconductors
d) None of the above
Answer: c) Semiconductors
Which method of producing current flow involves rubbing two materials together?
a) Static electricity from friction
b) Thermoelectricity
c) Piezoelectricity
d) Electrochemistry
Answer: a) Static electricity from friction
What is the name given to electricity produced from heat?
a) Static electricity
b) Thermoelectricity
c) Piezoelectricity
d) Magnetoelectricity
Answer: b) Thermoelectricity
Which method of producing current flow involves applying pressure to certain
crystalline materials?
a) Static electricity from friction
b) Thermoelectricity
c) Piezoelectricity
d) Electrochemistry
Answer: c) Piezoelectricity
What is the name given to electricity produced from a chemical reaction?
a) Static electricity
b) Thermoelectricity
c) Piezoelectricity
d) Electrochemistry
Answer: d) Electrochemistry
What is the name given to electricity produced from light?
a) Static electricity
b) Thermoelectricity
c) Photoelectricity
d) Electrochemistry
Answer: c) Photoelectricity
Which method of producing current flow involves the force of a magnetic field?
a) Static electricity from friction
b) Thermoelectricity
c) Piezoelectricity
d) Magnetoelectricity
Answer: d) Magnetoelectricity
What is the unit used to measure electrical pressure?
a) Ampere
b) Volt
c) Ohm
d) Watt
Answer: b) Volt
What is the rate of current flow in a closed electrical system measured in?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: b) Ampere
Which factor affects the resistance to flow of current in a conductor?
a) Length of the conductor
b) Diameter of the conductor
c) Type of conductor material
d) All of the above
Answer: d) All of the above
What is the unit used to measure electrical resistance?
a) Ampere
b) Volt
c) Ohm
d) Watt
Answer: c) Ohm
What is the driving force behind current flow?
a) Voltage
b) Amperage
c) Resistance
d) Wattage
Answer: a) Voltage
What is the rate of current flow also known as?
a) Voltage
b) Amperage
c) Resistance
d) Wattage
Answer: b) Amperage
What is the ability of a conductor to resist current flow measured in?
a) Volt
b) Ampere
c) Ohm
d) Watt
Answer: c) Ohm
Which law relates voltage, amperage, and resistance in an active electrical
circuit?
a) Newton's Law
b) Einstein's Law
c) Ohm's Law
d) Boyle's Law
Answer: c) Ohm's Law
What is the formula for Ohm's Law?
Answer: V = IR
What is the driving force behind current flow according to Ohm's Law?
a) Voltage
b) Amperage
c) Resistance
d) Wattage
Answer: a) Voltage
What is power?
A) The rate at which work is accomplished
B) The flow of electric charge through a conductor
C) The resistance to flow of current in a conductor
D) The ability of a conductor to conduct electricity
Answer: A) The rate at which work is accomplished
What is an overcurrent protection device used for in a circuit?
A) To control the operation of the load
B) To protect the load and/or conductors from excessive heat
C) To interrupt the path of current flow in the circuit
D) To measure the rate of current flow in a closed electrical system
Answer: B) To protect the load and/or conductors from excessive heat
What is the electrical unit of power?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: D) Watt
What is the formula for calculating power on a direct current circuit?
A) P = EI
B) P = E + I
C) P = E x I
D) P = E - I
Answer: A) P = EI
What is the standard billing for energy consumption?
A) Watt-hour
B) Kilowatt
C) Kilowatt-hour
D) Btu/hr
Answer: C) Kilowatt-hour
What is the unit used to measure electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C) Ohm
In which circuit configuration do components have the same voltages?
A) Series circuit
B) Parallel circuit
C) Both A and B
Answer: B) Parallel circuit
What is a simple circuit composed of?
A) Power source, load, and switch
B) Power source, conductor, and load
C) Conductor, load, and switch
D) Power source, conductor, load, and switch
Answer: D) Power source, conductor, load, and switch
Which circuit configuration is commonly used in electrical systems?
A) Series circuit
B) Parallel circuit
C) Both A and B
Answer: B) Parallel circuit
What is the electrical unit of power?
A) Ohm
B) Watt
C) Volt
Answer: B) Watt
What happens in a series circuit if one component fails?
A) The circuit remains closed and all components remain functional
B) The circuit becomes open and all components stop working
C) The voltage in the circuit drops
Answer: B) The circuit becomes open and all components stop working
What is the standard billing for energy consumption?
A) Watt
B) Kilowatt-hour (kWh)
C) Ohm
Answer: B) Kilowatt-hour (kWh)
What is the equivalent resistance of resistors connected in series?
A) The sum of the individual resistances
B) The difference between the individual resistances
C) The product of the individual resistances
Answer: A) The sum of the individual resistances
Which type of circuit requires fewer connections?
A) Series circuit
B) Parallel circuit
C) Both A and B
Answer: A) Series circuit
Which law states that the sum of the potential differences in a complete circuit
must be zero?
A) Kirchhoff's Voltage Law (KVL)
B) Kirchhoff's Current Law (KCL)
C) Ohm's Law
Answer: A) Kirchhoff's Voltage Law (KVL)
What is a simple magnet composed of?
a) North and South poles
b) South and West poles
c) East and North poles
Answer: a) North and South poles
According to Kirchhoff's Current Law (KCL), what happens to the total current
flowing into and out of a junction in a circuit?
What is induction in relation to electrical current flow?
a) The voltage that causes current to flow through a conductor
What is a closed circuit?
A) A circuit that is interrupted
B) A circuit that allows a continuous flow of current through an electrical
conductor
C) A circuit that has a protective device
D) A circuit that has a control device
Answer: B) A circuit that allows a continuous flow of current through an electrical
conductor
What is an open circuit?
A) A circuit that is uninterrupted
B) A circuit that allows a continuous flow of current through an electrical
conductor
C) A circuit that has a protective device
D) A circuit that is interrupted
Answer: D) A circuit that is interrupted
What is a switch used for in a circuit?
A) To protect the load and/or conductors from excessive heat
B) To open or close the path of the circuit
C) To allow a continuous flow of current through an electrical conductor
D) To measure the rate of current flow in a closed electrical system
A) The total current flowing into the junction is greater than the total current
flowing out of the junction
B) The total current flowing out of the junction is greater than the total current
flowing into the junction
C) The total current flowing into the junction is equal to the total current flowing
out of the junction
Answer: C) The total current flowing into the junction is equal to the total current
flowing out of the junction
Which circuiting configuration is used in a string of low-cost Christmas lamps?
A) Series circuit
B) Parallel circuit
C) Both A and B
Answer: A) Series circuit
b) The phenomenon when a magnetic field moves across a fixed conductor
c) The cancellation of the magnetic field when the circuit is opened
Answer: b) The phenomenon when a magnetic field moves across a fixed
conductor
How does increasing voltage affect the magnetic field around a conductor?
a) It has no effect on the magnetic field
b) It produces a weaker magnetic field
c) It produces a stronger magnetic field
Answer: c) It produces a stronger magnetic field
Which of the following always flows from the negative to the positive terminal of
the power source?
a) Direct current
b) Alternating current
c) Both
Answer: a) Direct current
Which of the following electrical systems has two conductors, one neutral and
one hot?
a) Single-phase alternating current power
b) Three-phase alternating current power
c) Direct current power
Answer: a) Single-phase alternating current power
Which of the following electrical systems has three separate lines of single-phase
power out of phase by 120°?
a) Single-phase alternating current power
b) Three-phase alternating current power
c) Direct current power
Answer: b) Three-phase alternating current power
What is the difference between direct current and alternating current?
a) Direct current flows in one direction, while alternating current changes direction
periodically.
b) Direct current changes direction periodically, while alternating current flows in
one direction.
c) Direct current and alternating current are the same thing.
Answer: a) Direct current flows in one direction, while alternating current changes
direction periodically.
Which of the following is designed to operate on DC power?
a) Electric stove
b) Flashlight
c) Television
Answer: b) Flashlight
What is the function of a transformer?
a) To transfer direct current from one circuit to another.
b) To transfer alternating current and voltage from one circuit to another.
c) To convert AC to DC power.
Answer: b) To transfer alternating current and voltage from one circuit to another.
Which of the following graphs shows the voltage versus time for direct current?
a) Figure 1
b) Figure 2
c) None of the above
Answer: a) Figure 1
Which of the following is a continuous reversal of the direction of current flow?
a) Direct current
b) Alternating current
c) None of the above
Answer: b) Alternating current
Which of the following systems has all the voltages of the supply varying in
unison?
a) Single-phase alternating current power
b) Three-phase alternating current power
c) Direct current power
Answer: a) Single-phase alternating current power
In a three-phase alternating current distribution system, each line is out of phase
by:
a) 60°
b) 90°
c) 120°
Answer: c) 120°
What is the primary purpose of a transformer?
a) To create an electromagnetic field
b) To store electrical energy
c) To transfer AC voltage and current from one circuit to another
d) To impede current flow in a DC circuit
Answer: c) To transfer AC voltage and current from one circuit to another
What is an inductor?
a) A coil of wire that creates an electrostatic field
b) A device that stores electrical energy
c) A device that impedes current flow in a DC circuit
d) A coil of wire that creates an electromagnetic field
Answer: d) A coil of wire that creates an electromagnetic field
What effect does inductance have on an AC circuit?
a) Causes the phase of the voltage to lead the phase of the current
b) Causes the phase of the voltage to lag behind the phase of the current
c) Has no effect on the phase relationship between voltage and current
d) Impedes current flow in an AC circuit
Answer: b) Causes the phase of the voltage to lag behind the phase of the
current
What effect does capacitance have on an AC circuit?
a) Causes the phase of the voltage to lead the phase of the current
b) Causes the phase of the voltage to lag behind the phase of the current
c) Has no effect on the phase relationship between voltage and current
d) Impedes current flow in an AC circuit
Answer: a) Causes the phase of the current to lead the phase of the voltage
What is impedance?
a) A measure of resistance to current flow on an AC circuit
b) A measure of the amount of electrical energy stored in a capacitor
c) A measure of the amount of electrical energy stored in an inductor
d) A measure of the amount of power consumed by a circuit
Answer: a) A measure of resistance to current flow on an AC circuit
What is the unit of measurement for impedance?
a) Watts
b) Volts
c) Amperes
d) Ohms
Answer: d) Ohms
What is the formula for Ohm's Law on an AC circuit?
a) V = IR
b) P = VI
c) E = IZ
d) I = V/R
Answer: c) E = IZ
What is a capacitor made of?
a) Metal plates separated by air or a dielectric material
b) A coil of wire
c) A battery
d) A resistor
Answer: a) Metal plates separated by air or a dielectric material
What is the primary purpose of an inductive load?
a) To store electrical energy
b) To impede current flow in a DC circuit
c) To create an electromagnetic field
d) To create resistance to current flow on an AC circuit
Answer: c) To create an electromagnetic field
What is the primary purpose of a capacitive load?
a) To store electrical energy
b) To impede current flow in a DC circuit
c) To create an electrostatic field
d) To create resistance to current flow on an AC circuit
Answer: d) To create resistance to current flow on an AC circuit
In which units is apparent power expressed?
a. Volts (V)
b. Amps (A)
c. Volt-amperes (VA)
Answer: c. Volt-amperes (VA)
What is the product of voltage and amperage on a DC circuit?
a. Wattage
b. Reactive power
c. Apparent power
Answer: a. Wattage
What is the product of voltage and current on an AC circuit?
a. Wattage
b. Reactive power
c. Apparent power
Answer: c. Apparent power
In AC circuits, why does the computed volt-amperage differ from power
consumed?
a. Due to the inductive effects in circuits powering motors and transformers
b. Due to the resistance in the circuit
c. Due to the capacitive effects in the circuit
Answer: a. Due to the inductive effects in circuits powering motors and
transformers
What is power factor (PF)?
a) The ratio of real power to reactive power
b) The ratio of real power to apparent power
c) The ratio of reactive power to apparent power
Answer: b) The ratio of real power to apparent power
What is the power that performs useful effort in a circuit called?
a. Reactive power
b. Apparent power
c. Real power
Answer: c. Real power
In which units is real power expressed?
a. Volt-amperes (VA)
b. Kilowatts (kW)
c. Amps (A)
Answer: b. Kilowatts (kW)
What is the power that generates the magnetic field required for inductive devices
to operate called?
a. Real power
b. Reactive power
c. Apparent power
Answer: b. Reactive power
Does reactive power dissipate any energy in the load?
a. Yes
b. No
Answer: b. No
What is the power available to use called?
a. Real power
b. Reactive power
c. Apparent power
Answer: c. Apparent power
What is the range of power factor?
a) 0 to 10
b) 0 to 1
c) 1 to 10
Answer: b) 0 to 1
Why is power factor correction important?
a) To reduce the load currents
b) To save on power company charges
c) Both a and b
Answer: c) Both a and b
a) The billing fee related to maximum demand
b) The billing fee related to energy consumption
c) The billing fee related to power factor
Answer: a) The billing fee related to maximum demand
How long is the time interval usually used to measure maximum demand?
a) 5 min
b) 15 min
c) 30 min
Answer: b) 15 min
Can a high demand charge remain at that rate for 12 months even though the
demand for succeeding months is significantly lower?
a) Yes
b) No
Answer: a) Yes
What is the main advantage of a high power factor?
a) It reduces the hardware costs
b) It reduces the load currents
c) It reduces the power company charges
Answer: b) It reduces the load currents
What is demand limiting?
a) A method of increasing power consumption during periods of high demand
b) A method of disconnecting nonessential loads during periods of high demand
c) A method of shifting nonessential loads to periods of high demand
Answer: b) A method of disconnecting nonessential loads during periods of high
demand
What is the purpose of power factor correction capacitors?
a) To increase the power factor
b) To decrease the power factor
c) To stabilize the voltage
Answer: a) To increase the power factor
What is load shedding?
a) A method of increasing power consumption during periods of high demand
b) A method of disconnecting nonessential loads during periods of high demand
c) A method of shifting nonessential loads to periods of high demand
Answer: b) A method of disconnecting nonessential loads during periods of high
demand
What is maximum demand?
a) The user's lowest rate at which energy is consumed
b) The user's highest rate at which energy is consumed
c) The user's average rate at which energy is consumed
Answer: b) The user's highest rate at which energy is consumed
What is load shifting?
a) A method of increasing power consumption during periods of high demand
b) A method of disconnecting nonessential loads during periods of high demand
c) A method of shifting nonessential loads to periods of low demand
Answer: c) A method of shifting nonessential loads to periods of low demand
How is maximum demand measured?
a) Over a billing period
b) Over a year
c) Over a day
Answer: a) Over a billing period
What is the time-of-use (TOU) rate?
a) A rate that rewards the user for increasing power consumption during periods
of high demand
b) A rate that rewards the user for reducing power consumption during periods of
high demand
c) A rate that remains constant regardless of the time of day or year
What is demand charge?
Answer: b) A rate that rewards the user for reducing power consumption during
periods of high demand
What is the purpose of additional surcharges?
a) To reward users for reducing power consumption during peak periods
b) To cover the cost of metering and billing activities
c) To encourage users to increase power consumption during peak periods
Answer: b) To cover the cost of metering and billing activities
What is a service or billing charge?
a) A charge for increasing power consumption during peak periods
b) A charge for reducing power consumption during peak periods
c) A charge that covers the cost of metering and billing activities
Answer: c) A charge that covers the cost of metering and billing activities
What is the benefit of load shedding and demand limiting?
a) They increase power consumption during peak periods
b) They reduce the need for additional power generation capacity
c) They increase the cost of electricity for consumers
Answer: b) They reduce the need for additional power generation capacity.
What is a power station?
a) A factory that produces clothing
b) An industrial facility that generates electrical energy
c) A laboratory that conducts experiments
Answer: b) An industrial facility that generates electrical energy
What is the function of a generator in a power station?
a) To convert electrical energy into mechanical energy
b) To convert mechanical energy into electrical energy
c) To store electrical energy
Answer: b) To convert mechanical energy into electrical energy
What type of turbine is used in a power station?
a) Water turbine
b) Gas turbine
c) Steam turbine
Answer: c) Steam turbine
What moves through a steam turbine to drive rotation of the discs attached to the
turbine shaft?
a) High pressure water
b) High pressure steam
c) Air
Answer: b) High pressure steam
How is steam produced in a power station?
a) By burning water
b) By heating water with coal, oil, or natural gas
c) By freezing water
Answer: b) By heating water with coal, oil, or natural gas
What type of reaction creates heat to produce steam in a nuclear power plant?
a) Chemical reaction
b) Nuclear reaction
c) Electrochemical reaction
Answer: b) Nuclear reaction
What is the primary purpose of a power station?
a) To generate heat
b) To produce steam
c) To generate electrical energy
Answer: c) To generate electrical energy
What is a service drop?
a) An underground electrical line
b) An overhead electrical line
c) A type of circuit breaker
Answer: b) An overhead electrical line
Power transmission and distribution
What is an armature in a generator?
a) A mechanical device that produces electricity
b) A shaft with conductor windings wrapped around an iron core
c) A stationary magnetic field
Answer: b) A shaft with conductor windings wrapped around an iron core
What is the purpose of a turbine in a power station?
a) To produce steam
b) To generate electrical energy
c) To rotate the armature shaft of a generator
Answer: c) To rotate the armature shaft of a generator
What type of engine is a turbine?
a) A reciprocating engine
b) A rotary engine
c) A jet engine
Answer: b) A rotary engine
a.
Answer:
b.
c.
d.
What is the purpose of service entrance conductors?
a) To measure electrical energy consumed
b) To cut off power to a building
c) To connect the service point to the service equipment
Answer: c) To connect the service point to the service equipment
e.
f.
What is a service lateral?
a) The service equipment that receives the service entrance conductors
b) The underground service conductors between the street main and the first
point of connection to the service entrance conductors
c) A type of electric meter
Answer: b) The underground service conductors between the street main and the
first point of connection to the service entrance conductors
What components are included in the service entrance?
a) Main disconnect, overcurrent protection devices, and electric meter
b) Switchboard and panelboards
c) Service entrance conductors and service lateral
Answer: a) Main disconnect, overcurrent protection devices, and electric meter
What is the purpose of an electric meter?
a) To measure and record electrical energy consumed
b) To protect the service entrance conductors
c) To divide large amounts of electrical current into smaller amounts
Answer: a) To measure and record electrical energy consumed
Three-phase transformer has three primary and three secondary windings. There
are
two main types of three phase transformers: delta and wye.
How are building transformers rated?
a) In volts
b) In amps
c) In kVA
d) In watts
Answer: c) In kVA
What information can be found on a transformer nameplate?
a) Rated kVA, primary and secondary voltage, impedance, required clearances
b) Manufacturer name, color, weight, height
c) Installation date, warranty information, operating instructions
d) None of the above
Answer: a) Rated kVA, primary and secondary voltage, impedance, required
clearances
What is a switchboard?
a) A type of electric meter
b) A large cabinet or assembly of metal cabinets in which disconnecting switches,
overcorrect protection devices, and instruments are connected
c) A type of circuit breaker
Answer: b) A large cabinet or assembly of metal cabinets in which disconnecting
switches, overcorrect protection devices, and instruments are connected
What is a step-down transformer?
a) A transformer with a secondary voltage that is greater than its primary voltage
b) A transformer with a secondary voltage that is equal to its primary voltage
c) A transformer with a secondary voltage that is less than its primary voltage
d) A transformer that does not change voltage
Answer: c) A transformer with a secondary voltage that is less than its primary
voltage
What is a panelboard?
a) A type of electric meter
b) A large cabinet or assembly of metal cabinets in which disconnecting switches,
overcorrect protection devices, and instruments are connected
c) One or more metal cabinets that serve as a single unit, including buses and
automatic overcurrent protection devices
Answer: c) One or more metal cabinets that serve as a single unit, including
buses and automatic overcurrent protection devices
What is the purpose of a main disconnect?
a) To measure and record electrical energy consumed
b) To cut off power to a building
c) To divide large amounts of electrical current into smaller amounts
Answer: b) To cut off power to a building
What is a step-up transformer?
a) A transformer with a secondary voltage that is less than its primary voltage
b) A transformer with a secondary voltage that is equal to its primary voltage
c) A transformer with a secondary voltage that is greater than its primary voltage
d) A transformer that does not change voltage
Answer: c) A transformer with a secondary voltage that is greater than its primary
voltage
What are overcurrent protection devices?
a) Devices that measure and record electrical energy consumed
b) Devices that protect the service entrance conductors
c) Devices that divide large amounts of electrical current into smaller amounts
Answer: b) Devices that protect the service entrance conductors
What is the most common type of transformer used in residential and small
commercial applications?
a) Three-phase transformer b) Step-up transformer
c) Single-phase transformer d) Delta transformer
Answer: c) Single-phase transformer
What type of meter is used in building services rated up to about 400 A?
a) Feed-through meter
b) Electric panel meter
c) Digital meter
Answer: a) Feed-through meter
What are the two main types of three-phase transformers?
a) Wye and delta
b) Single-phase and double-phase
c) Step-up and step-down
d) High-voltage and low-voltage
Answer: a) Wye and delta
What is the purpose of a step-up transformer in power distribution?
a) To decrease voltage and increase current
b) To increase voltage and decrease current
c) To increase voltage and increase current
d) To decrease voltage and decrease current
Answer: c) To increase voltage and increase current
What is the purpose of transformers in power distribution?
a) To convert mechanical energy into electrical energy
b) To change voltage, current, and phase of electrical power
c) To store electrical energy
d) To measure electrical energy consumption
Answer: b) To change voltage, current, and phase of electrical power
What is the voltage configuration of a 7200/240/120 V AC, single-phase,
three-wire transformer?
a) Single primary winding, single secondary winding
b) Three primary windings, three secondary windings
c) Delta configuration
d) Wye configuration
Answer: a) Single primary winding, single secondary winding
What is the purpose of a step-down transformer in power distribution?
a) To decrease voltage and increase current
b) To increase voltage and decrease current
c) To increase voltage and increase current
d) To decrease voltage and decrease current
Answer: d) To decrease voltage and decrease current
Why is interrupting rating important in OCP devices?
a. It prevents the circuit from overheating
b. It ensures the circuit breaker will not trip unnecessarily
c. It must be sufficient for the maximum possible fault-current to prevent hazards
and equipment damage
Answer: c
What is the purpose of an overcurrent protection device?
a. To increase current flow in a circuit
b. To safeguard the circuit components from severe overheating
c. To trip off the circuit when current flow is low
Answer: b
What could happen if the OCP device is not rated to interrupt at the available
fault-current?
a. The circuit will trip off unnecessarily
b. The OCP device will explode while attempting to clear the fault
c. The circuit components will overheat and cause damage
Answer: b
What is a circuit breaker?
a. An overcurrent protection device that opens the circuit when current flow is low
b. An overcurrent protection device that automatically trips off when current flow
exceeds the circuit rating
c. An overcurrent protection device that consists of a strip of metal with a low
melting temperature
Answer: b
What is a fuse?
a. An overcurrent protection device that opens the circuit when current flow is low
b. An overcurrent protection device that serves as a switch that can be opened
and closed manually
c. An overcurrent protection device that consists of a strip of metal with a low
melting temperature
Answer: c
What is the overcurrent rating of an OCP device?
a. The highest amperage it can carry continuously without overheating
b. The lowest amperage it can carry continuously without overheating
c. The highest amperage it can carry continuously regardless of temperature
Answer: a
What happens when the current flowing through an OCP device exceeds its
setting for a significant period?
a. The OCP device opens the circuit
b. The OCP device increases the current flow in the circuit
c. The OCP device trips off when current flow exceeds the circuit rating
Answer: a
What is the interrupting rating of an OCP device?
a. The highest amperage it can carry continuously without overheating
b. The lowest amperage it can carry continuously without overheating
c. The maximum possible fault-current it can interrupt
Answer: c
What is the main difference between a circuit breaker and a fuse?
a. A circuit breaker can be opened and closed manually, while a fuse cannot
b. A circuit breaker consists of a strip of metal with a low melting temperature,
while a fuse does not
c. A circuit breaker automatically trips off when current flow exceeds the circuit
rating, while a fuse opens the circuit when its current rating is exceeded
Answer: c
What is the purpose of overcurrent protection devices in a building?
a. To increase current flow in circuits
b. To protect the circuit components from severe overheating
c. To prevent electricity from flowing through the building
Answer: b
What is the definition of utilization equipment?
a) A device that carries but does not use electricity
b) A machine or instrument that performs a specific function using electrical
energy
c) A type of outlet used for lighting fixtures
Answer: b
What is the purpose of a switch?
a) To establish an electrical connection with an inserted plug
b) To provide power to a light fixture
c) To safely and intentionally open or close a circuit or redirect the path of current
in a circuit
Answer: c
a) It varies power to a circuit
b) It deactivates a circuit after a preset time period has lapsed
c) It controls the time period that a piece of equipment operates
d) It controls a lighting or equipment installation by sensing occupants in a space
Answer: d) It controls a lighting or equipment installation by sensing occupants in
a space.
What is the difference between fixed and stationary appliances?
a) There is no difference between them
b) Fixed appliances can be moved to another outlet while stationary appliances
cannot
c) Stationary appliances are permanently attached while fixed appliances are
situated at a specific location
Answer: c
What is a stationary appliance?
a) An appliance that can be easily carried or moved
b) An appliance that is permanently attached
c) An appliance that is situated and used at a specific location but can be moved
to another outlet
Answer: b
What type of heat source does an infrared sensor respond to?
a) Visible light
b) Ultraviolet light
c) Infrared heat
d) Microwave radiation
Answer: c) Infrared heat.
What is the purpose of a receptacle?
a) To establish an electrical connection with an inserted plug
b) To provide power to a light fixture
c) To safely and intentionally open or close a circuit
Answer: a
What is the definition of an appliance?
a) A device that carries but does not use electricity
b) A machine or instrument that performs a specific function using electrical
energy
c) A type of switch used for appliances
Answer: b
What is the field of view of an infrared sensor's lens divided into?
a) Several zones
b) One large area
c) A circular pattern
d) A square pattern
Answer: a) Several zones.
What is the definition of a plug?
a) A device placed between two or more electrical conductors in a circuit
b) A female connecting device with slotted contacts
c) A connector typically attached to a flexible cord and used to attach portable
appliances to electrical outlets
Answer: c
What is the function of an automatic switch?
a) It varies power to a circuit
b) It deactivates a circuit after a preset time period has lapsed
c) It controls the time period that a piece of equipment operates
d) It senses light and opens or closes a circuit with the presence of light
Answer: b) It deactivates a circuit after a preset time period has lapsed.
What is the frequency range of ultrasonic sensors?
a) 10-20 kilohertz
b) 20-30 kilohertz
c) 25-40 kilohertz
d) 40-50 kilohertz
Answer: c) 25-40 kilohertz.
What is the definition of an outlet?
a) The location in a branch circuit where conductors provide power to a light
fixture
b) The location in a branch circuit where electricity is used
c) A type of electrical device designed to carry but not use electricity
Answer: b
What is the function of a dimmer switch?
a) It varies power to a circuit
b) It deactivates a circuit after a preset time period has lapsed
c) It controls the time period that a piece of equipment operates
d) It senses light and opens or closes a circuit with the presence of light
Answer: a) It varies power to a circuit.
What is a potential issue with using ultrasonic sensors?
a) They require a direct line of sight to the occupant
b) They do not detect small movements
c) They can be triggered by extraneous signals
d) They only work well in outdoor spaces
Answer: c) They can be triggered by extraneous signals.
What is the difference between a fixed appliance and a portable appliance?
a) There is no difference between them
b) Fixed appliances are situated and used at a specific location while portable
appliances can be easily carried or moved
c) Portable appliances are permanently attached while fixed appliances can be
moved to another outlet
Answer: b
What is the function of a time clock?
a) It varies power to a circuit
b) It deactivates a circuit after a preset time period has lapsed
c) It controls the time period that a piece of equipment operates
d) It senses light and opens or closes a circuit with the presence of light
Answer: c) It controls the time period that a piece of equipment operates.
Where are occupancy sensors typically mounted?
a) On the floor
b) On the ceiling
c) On a piece of furniture
d) On a window
Answer: b) On the ceiling.
What is the function of a photocell control?
a) It varies power to a circuit
b) It deactivates a circuit after a preset time period has lapsed
c) It controls the time period that a piece of equipment operates
d) It senses light and opens or closes a circuit with the presence of light
Answer: d) It senses light and opens or closes a circuit with the presence of light.
What is an electrical conductor?
a) Any material that conducts magnetic current
b) Any material that conducts electrical current
c) Any material that conducts sound waves
Answer: b) Any material that conducts electrical current
What is an electrical device?
a) A device placed between two or more electrical conductors in a circuit
b) A component in an electrical system that is designed to carry but not use
electricity
c) A type of outlet used for appliances
Answer: b
What is the function of an occupancy sensor?
How are conductors used in building applications classified?
a) According to the wire material
b) According to the wire diameter
c) According to the wire gauge standard and cross-sectional area
Answer: c) According to the wire gauge standard and cross-sectional area
What is nonmetallic-sheathed cable commonly called by its trade name?
a) Romex
b) Metallica
c) Metallic-Sheathed Cable
Answer: a) Romex
What is a bus bar?
a) A type of insulated wire
b) A type of electrical switch
c) An electrical conductor that serves as a common connection for two or more
electrical circuits
Answer: c) An electrical conductor that serves as a common connection for two or
more electrical circuits
In what types of applications can Type NM and Type NMC cables typically be
used?
a) Dry and damp applications
b) Wet and exposed conditions
c) Both a and b
Answer: a) Dry and damp applications
What is the best electrical conductor material (other than a superconductor
material)?
a) Silver
b) Gold
c) Copper
Answer: a) Silver
a.
Which cable is suitable for direct-burial applications?
a) Service entrance cable
b) Armored cable
c) Underground feeder cable
d) Flat conductor cable
Answer: c) Underground feeder cable
Which cable is suitable for exposed above-grade conditions?
a) Armored cable
b) Underground feeder cable
c) Service entrance cable
d) Flat conductor cable
Answer: c) Service entrance cable
Which cable is enclosed within a flexible spiral-shaped metallic enclosure?
a) Armored cable
b) Underground feeder cable
c) Service entrance cable
d) Flat conductor cable
Answer: a) Armored cable
b.
Why are silver and gold not commonly used as conductor materials in building
installations?
a) They have too much resistance
b) They are too brittle
c) They are too costly
Answer: c) They are too costly
What is the purpose of insulation on a conductor?
a) To provide electrical isolation and physical protection
b) To increase the resistance of the conductor
c) To reduce the current flow in the conductor
Answer: a) To provide electrical isolation and physical protection
c.
d.
e.
What determines the environment in which a conductor can be used safely?
a) The material of the conductor
b) The gauge of the conductor
c) The type of insulation protecting the conductor
Answer: c) The type of insulation protecting the conductor
What is a cable?
a) An electrical switch
b) An electrical conductor
c) More than one conductor bundled together in a factory assembly of wires
Answer: c) More than one conductor bundled together in a factory assembly of
wires
Which cable is similar to armored cable but not limited to the number of
conductors it can carry?
a) Armored cable
b) Underground feeder cable
c) Metal-clad cable
d) Flat conductor cable
Answer: c) Metal-clad cable
f.
g.
Which cable is not suitable for installation in conduit inside buildings because it
does not have the necessary flame retardant?
a) Armored cable
b) Underground feeder cable
c) Service entrance cable
d) Flat conductor cable
Answer: b) Underground feeder cable
Which cable is designed to rest between the topside of a smooth continuous
subfloor and carpet squares?
a) Armored cable
b) Underground feeder cable
c) Flat conductor cable
d) Metal-clad cable
Answer: c) Flat conductor cable
Which cable contains a 16 AWG bonding strip that acts as an equipment ground?
a) Armored cable b) Underground feeder cable
c) Service entrance cable d) Metal-clad cable
Answer: a) Armored cable
Which cable can be used in many locations not allowed with AC cable?
a) Armored cable
b) Underground feeder cable
c) Metal-clad cable
d) Service entrance cable
Answer: c) Metal-clad cable
Which cable can serve general purpose and appliance circuits up to 20 A and
individual circuits up to 30 A?
a) Armored cable
b) Underground feeder cable
c) Flat conductor cable
d) Service entrance cable
Answer: c) Flat conductor cable
Which cable supplements the internal grounding conductor but cannot be used by
itself as an equipment ground?
a) Armored cable
b) Underground feeder cable
c) Metal-clad cable
d) Service entrance cable
Answer: c) Metal-clad cable
What is the maximum voltage for which thermostat cable is typically used?
a) 120V
b) 240V
c) 30V
d) 480V
Answer: c) 30V
Which of the following is NOT a typical application for cords?
a) Power tools
b) Large stationary equipment
c) Detachable computer power cords
d) House wiring
Answer: d) House wiring
What does conductor ampacity refer to?
a) The maximum voltage a conductor can handle
b) The maximum current a conductor can handle continuously without exceeding
temperature limitations
c) The maximum temperature a conductor can reach before it overheats
d) The maximum length of a conductor before it experiences significant power
loss
Answer: b) The maximum current a conductor can handle continuously without
exceeding temperature limitations
What factors affect conductor ampacity?
a) Wire thickness, insulation and sheathing type, and number of conductors
bundled together
b) Voltage, insulation and sheathing type, and ambient temperature
c) Conductor material, voltage, and ambient temperature
d) Number of conductors bundled together, ambient temperature, and wire
thickness
Answer: a) Wire thickness, insulation and sheathing type, and number of
conductors bundled together
Why does voltage drop occur in conductors?
a) Because the current flow through a conductor changes
b) Because the conductor material is not suitable for the application
c) Because the power equation P = EI requires a drop in voltage if power is lost
d) Because the insulation on the conductor degrades over time
Answer: c) Because the power equation P = EI requires a drop in voltage if power
is lost
Which of the following is an example of an application for which thermostat cable
might be used?
a) Wiring for an electric water heater
b) Wiring for a doorbell
c) Wiring for a large stationary machine
d) Wiring for an electric vehicle charging station
Answer: b) Wiring for a doorbell
What is the typical gauge range for conductors in cords?
a) No. 4 AWG to No. 1 AWG
b) No. 14 AWG to No. 4/0 AWG
c) No. 18 AWG to No. 16 AWG
d) No. 6 AWG to No. 2 AWG
Answer: c) No. 18 AWG to No. 16 AWG
Which of the following is NOT a factor affecting conductor ampacity?
a) Conductor color
b) Insulation and sheathing type
c) Conductor material
d) Number of conductors bundled together
Answer: a) Conductor color
Which of the following is NOT a type of cable discussed in the article?
a) Flat conductor cable
b) Metal-clad cable
c) Armored cable
d) Twisted pair cable
Answer: d) Twisted pair cable
Why are cords made of stranded conductors instead of solid conductors?
a) To reduce the cost of manufacturing
b) To increase the flexibility of the cord
c) To reduce the maximum current capacity of the cord
d) To increase the voltage drop in the cord
Answer: b) To increase the flexibility of the cord
What is an enclosure in electrical systems?
a. A metal box for holding devices
b. A plastic container for holding wires
c. A type of conduit for routing cables
Answer: a
Which of the following is not a primary shape of electrical boxes?
a. Square
b. Rectangular
c. Hexagonal
Answer: c
What is a raceway in electrical systems?
a. An enclosed channel for holding wires or cables
b. A type of switch for controlling circuits
c. A tool used for cutting conduit
Answer: a
What is the difference between rigid metal conduit and intermediate metal
conduit?
a. Rigid metal conduit has a thinner wall than IMC
b. IMC is made of aluminum while rigid metal conduit is made of steel
c. Rigid metal conduit has a much smoother surface than IMC
Answer: c
What is the maximum nominal diameter for electrical metallic tubing (EMT)?
a. 2 inches
b. 4 inches
c. 6 inches
Answer: b
Which type of conduit is semiflexible and can be bent by hand?
a. Rigid nonmetallic conduit
b. Electrical metallic tubing (EMT)
c. Electrical nonmetallic tubing (ENT)
Answer: c
How is rigid nonmetallic conduit joined together?
a. With fittings that are screwed on
b. With fittings that are crimped on
c. With fittings that are solvent welded
Answer: c
What is the purpose of using an electrical box?
a. To hold devices such as switches or outlets
b. To protect the wiring and equipment from damage
c. To route cables from one location to another
Answer: a and b
Which type of conduit is heavy galvanized steel or aluminum with a UL Listed
stamp?
a. Rigid metal conduit
b. Intermediate metal conduit
c. Electrical metallic tubing (EMT)
Answer: a
What is electrical nonmetallic tubing (ENT) made of?
a. Galvanized steel
b. Aluminum
c. Corrugated plastic
Answer: c
What is the purpose of enclosures in electrical installations?
a) To increase the voltage of electrical equipment
b) To protect the wiring and equipment from damage
c) To reduce the current flow in electrical circuits
d) To generate electrical energy
Answer: b) To protect the wiring and equipment from damage
What is the primary function of electrical boxes?
a) To hold devices such as switches or outlets
b) To generate electrical energy
c) To increase the voltage of electrical equipment
d) To reduce the current flow in electrical circuits
Answer: a) To hold devices such as switches or outlets
Which of the following is a type of rigid metal conduit?
a) Electrical metallic tubing
b) Intermediate metal conduit
c) Electrical nonmetallic tubing
d) Liquid tight flexible metal conduit
Answer: b) Intermediate metal conduit
What is the difference between liquid tight flexible metal conduit and flexible metal
conduit?
a) Liquid tight flexible metal conduit is covered with a plastic, watertight jacket
b) Flexible metal conduit is installed without cables or wiring in it
c) Liquid tight flexible metal conduit is used to deliver large amounts of power
d) Flexible metal conduit is made of plastic
Answer: a) Liquid tight flexible metal conduit is covered with a plastic, watertight
jacket
What is the primary use of busway systems?
a) To deliver large amounts of power with low voltage drop
b) To carry small amounts of current
c) To generate electrical energy
d) To reduce the voltage of electrical equipment
Answer: a) To deliver large amounts of power with low voltage drop
What is the difference between feeder busway and plug-in busway?
a) Feeder busway is used to provide power tap-offs at multiple points
b) Plug-in busway is available in sizes from 600 A to several thousand amps
c) Feeder busway is used to deliver large amounts of power with low voltage drop
d) Plug-in busway is used in service equipment or as feeders
Answer: c) Feeder busway is used to deliver large amounts of power with low
voltage drop
What is the purpose of wireways?
a) To increase the voltage of electrical equipment
b) To reduce the current flow in electrical circuits
c) To enclose and protect conductors
d) To hold devices such as switches or outlets
Answer: c) To enclose and protect conductors
How are electric motors rated?
a) In volts
b) In watts
c) In horsepower
d) In amps
Answer: c) In horsepower
How much work per minute is equivalent to one horsepower?
a) 33,000 ft-lb
b) 550 ft-lb/s
c) 1,000 ft-lb
d) 5,000 ft-lb
Answer: a) 33,000 ft-lb
What is the approximate power an adult can produce continuously?
a) 1/4 horsepower
b) 1/8 horsepower
c) 1/2 horsepower
d) 1 horsepower
Answer: b) 1/8 horsepower
Which type of motor is designed to operate on both AC and DC power?
a) Split-phase motor
b) Capacitor motor
c) Universal motor
d) Induction motor
Answer: c) Universal motor
Which type of motor starts slowly with low torque and is not capable of starting
heavy loads?
a) Universal motor
b) Split-phase motor
c) Capacitor motor
d) Induction motor
Answer: b) Split-phase motor
Which type of motor has a capacitor that stores and discharges energy to help
start the motor rotor?
a) Universal motor
b) Split-phase motor
c) Capacitor motor
d) Induction motor
Answer: c) Capacitor motor
Which type of induction motor is capable of handling heavy starting loads?
a) Repulsion-start induction motor
b) Squirrel-cage induction motor
c) Wound-rotor induction motor
d) Capacitor-start induction motor
Answer: a) Repulsion-start induction motor
What is the purpose of a motor controller?
a) To generate electricity
b) To control the speed of the motor
c) To provide protection to the motor
d) All of the above
Answer: c) To provide protection to the motor
What is a variable-frequency drive (VFD)?
a) A mechanical device used to control the speed of a motor
b) A solid-state electronic power conversion device used to control the speed of a
motor
c) A type of motor that can operate on both AC and DC power
d) A type of motor that starts slowly with low torque
Answer: b) A solid-state electronic power conversion device used to control the
speed of a motor
Which type of motor is best suited for applications where high starting torque is
required?
a) Universal motor
b) Split-phase motor
c) Capacitor motor
d) Induction motor
Answer: d) Induction motor
Which type of motor is typically used in kitchen sink waste disposals?
a) Universal motor
b) Split-phase motor
c) Capacitor motor
d) Induction motor
Answer: a) Universal motor
What is the rating system for electric motors?
a) Kilowatts (kW)
b) Foot-pounds per second (ft-lb/s)
c) Horsepower (hp)
d) Joules (J)
Answer: c) Horsepower (hp)
Which type of motor is not capable of variable speed control?
a) Split-phase motor
b) Capacitor motor
c) Induction motor
d) Universal motor
Answer: a) Split-phase motor
What is the primary purpose of tamper-resistant receptacles?
A. To prevent electrical surges
B. To prevent foreign objects from touching live components
C. To improve energy efficiency
D. To increase the lifespan of electrical outlets
Answer: B
How does a tamper-resistant receptacle work?
A. It uses a ground fault circuit interrupter
B. It has a spring-loaded shutter mechanism that covers the contact openings
C. It prevents electrical current from flowing through the heart
D. It detects an extremely low leak of electrical current
Answer: B
How much electrical current flowing through the heart can disrupt the normal
coordination of heart muscles?
A. 6 to 200 mA
B. 1 to 3 A
C. 0.2 to 1 A
D. 200 to 400 mA
Answer: A
What is the primary function of a ground fault circuit interrupter (GFCI)?
A. To detect electrical surges
B. To prevent foreign objects from touching live components
C. To shut off power when an extremely low leak of electrical current is detected
D. To increase the lifespan of electrical outlets
Answer: C
How many children suffer electrical injuries each year from incidents involving
electrical outlets or receptacles, according to U.S. Consumer Product Safety
Commission data?
A. Approximately 2400
B. Approximately 500
C. Approximately 10000
D. Approximately 200
Answer: A
What is the most common method used to achieve tamper-resistance operation?
A. Ground fault interruption
B. Spring-loaded shutter mechanism
C. Use of plastic plug-in inserts
D. Wall plates with contact shutters
Answer: B
What is a ground fault?
A. The intentional flow of electrical current between a power source and a
grounded surface
B. The unintentional flow of electrical current between a power source and a
grounded surface
C. The intentional flow of electrical current between a power source and an
ungrounded wire
D. The unintentional flow of electrical current between a power source and an
ungrounded wire
Answer: B
What is the function of a safety shutter in a tamper-resistant receptacle?
A. To detect an extremely low leak of electrical current
B. To prevent foreign objects from touching live components
C. To shut off power when a ground fault occurs
D. To cover the contact openings when not in use
Answer: B
What is the minimum leak of electrical current that a ground fault circuit
interrupter can detect?
A. 6 mA
B. 60 mA
C. 600 mA
D. 6 A
Answer: A
What is the purpose of a ground fault circuit interrupter?
A. To prevent foreign objects from touching live components
B. To detect an extremely low leak of electrical current and shut off power quickly
C. To improve energy efficiency
D. To increase the lifespan of electrical outlets
Answer: B
Which of the following is NOT a type of GFCI?
a) Receptacle Outlet Type
b) Portable Type
c) Circuit Interrupter Type
d) Arc Fault Protection
Answer: c) Circuit Interrupter Type
Where is the Receptacle Outlet Type GFCI commonly installed?
a) In the kitchen b) In the bathroom
c) In the garage d) In the living room
Answer: b) In the bathroom
Which type of GFCI is used when permanent GFCIs are not practical?
a) Receptacle Outlet Type b) Portable Type
c) Circuit Interrupter Type d) None of the above
Answer: b) Portable Type
Which type of fault occurs when two wires of opposite polarity make direct
contact?
a) Parallel arcing faults
b) Ground arcing faults
c) Series arcing faults
d) None of the above
Answer: a) Parallel arcing faults
What causes the breakdown of protective insulation in household wiring?
a) Age
b) Dust
c) Settling and shifting of a home's foundation
d) All of the above
Answer: d) All of the above
What is the purpose of an AFCI?
a) To protect against ground faults
b) To protect against arc faults
c) To protect against short circuits
d) None of the above
Answer: b) To protect against arc faults
What type of faults can a traditional circuit breaker detect?
a) Low-level arc faults
b) High-level arc faults
c) Ground faults
d) None of the above
Answer: b) High-level arc faults
What does an AFCI do when it detects an arc fault?
a) It opens the circuit
b) It closes the circuit
c) It increases the voltage
d) None of the above
Answer: a) It opens the circuit
Which of the following is NOT a type of arc fault?
a) Parallel arcing faults
b) Ground arcing faults
c) Series arcing faults
d) Overcurrent arcing faults
Answer: d) Overcurrent arcing faults
Which type of GFCI can protect other electrical outlets downstream in the branch
circuit?
a) Receptacle Outlet Type
b) Portable Type
c) Circuit Interrupter Type
d) None of the above
Answer: a) Receptacle Outlet Type
What is an AFCI?
a) An appliance
b) A circuit breaker
c) A type of GFCI
d) An extension cord
Answer: b) A circuit breaker
What is the purpose of a convenience outlet type AFCI?
a) To protect branch-circuit wiring
b) To protect connected cord sets and power supply cords
c) To be moved from outlet to outlet
d) To protect the power-supply cord
Answer: b) To protect connected cord sets and power supply cords
Which type of AFCI is designed to protect the power-supply cord connected to it?
a) Circuit Breaker Type
b) Convenience Outlet Type
c) Portable Type
d) Cord-Mounted Type
Answer: d) Cord-Mounted Type
What can cause high levels of EMF in a building?
a) Faulty wiring
b) Lightning
c) Appliances beginning to fail
d) Electricity running through a wire
Answer: d) Electricity running through a wire
Why is it not recommended to connect essential equipment and appliances
containing perishable products into an outlet with GFCI or AFCI protection?
a) It can cause nuisance tripping
b) It can cause EMI
c) It can raise potential health concerns
d) None of the above
Answer: a) It can cause nuisance tripping
What is the purpose of ground fault protection (GFP)?
a) To detect and rapidly interrupt high-level equipment ground faults.
b) To detect and rapidly interrupt low-level equipment ground faults.
c) To regulate the flow of electrical current in a circuit.
d) To prevent power surges from reaching electric and electronic equipment.
Answer: b) To detect and rapidly interrupt low-level equipment ground faults.
What is nuisance tripping?
a) An appliance that is beginning to fail
b) Lightning causing AFCI tripping
c) Repeated tripping of AFCI/GFCI
d) Essential equipment connected to AFCI/GFCI
Answer: c) Repeated tripping of AFCI/GFCI
What principle does GFP operate on?
a) Monitoring the voltage drawn through the conductors of an electrical circuit.
b) Monitoring the current drawn through the conductors of an electrical circuit.
c) Monitoring the resistance drawn through the conductors of an electrical circuit.
d) Monitoring the power factor of an electrical circuit.
Answer: b) Monitoring the current drawn through the conductors of an electrical
circuit.
What is the primary cause of nuisance tripping?
a) Lightning
b) Faulty wiring
c) Appliances beginning to fail
d) Perishable products
Answer: c) Appliances beginning to fail
What type of sensing transformer is used in GFP?
a) Voltage transformer (VT). b) Current transformer (CT).
c) Power transformer (PT). d) Distribution transformer (DT).
Answer: b) Current transformer (CT).
What is the purpose of a portable AFCI?
a) To protect branch-circuit wiring
b) To protect connected cord sets and power supply cords
c) To be moved from outlet to outlet
d) To protect the power-supply cord
Answer: c) To be moved from outlet to outlet
What causes a power surge?
a) A sudden decrease in electrical current or voltage.
b) A lightning strike or sudden power spike caused by a problem in the utility
transmission and generating system.
c) The switching off of fluorescent light fixtures or other heavy equipment.
d) All of the above.
Answer: b) A lightning strike or sudden power spike caused by a problem in the
utility transmission and generating system.
What is EMF?
a) A type of AFCI
b) A type of GFCI
c) A silent, invisible magnetic field
d) A type of electrical appliance
Answer: c) A silent, invisible magnetic field
What is EMI?
a) Visible screen jitter in video displays
b) Humming in telephone/audio equipment
c) Data errors in magnetic media or digital signals
d) All of the above
Answer: d) All of the above
What kind of equipment can a power surge damage?
a) Computers, fax machines, and televisions only.
b) Stereos, VCRs, and electronic phone systems only.
c) Computers, fax machines, televisions, stereos, VCRs, and electronic phone
systems.
d) None of the above.
Answer: c) Computers, fax machines, televisions, stereos, VCRs, and electronic
phone systems.
What is a surge protection device (SPD)?
a) An electrical device that regulates the flow of electrical current in a circuit.
b) An electrical device that prevents power surges from reaching electric and
electronic equipment.
c) An electrical device that detects and interrupts low-level equipment ground
faults.
d) An electrical device that detects and interrupts high-level equipment ground
faults.
Answer: b) An electrical device that prevents power surges from reaching electric
and electronic equipment.
How do SPDs work?
a) By increasing the voltage of a power surge to a level that is safe for the
equipment they protect.
b) By instantaneously limiting the transient voltage from a power surge to a level
that is safe for the equipment they protect.
c) By diverting the current from a power surge through the protected equipment.
d) By isolating the protected equipment from the power source during a power
surge.
Answer: b) By instantaneously limiting the transient voltage from a power surge to
a level that is safe for the equipment they protect.
What type of device is a Metal Oxide Varistor (MOV)?
a) A semiconductor device used mainly on AC power applications that has surge
ratings ranging from a few hundred to many thousands of amps.
b) A sensing transformer used in ground fault protection.
c) A type of switch used to regulate the flow of electrical current in a circuit.
d) An electronic device used to detect and interrupt high-level equipment ground
faults.
Answer: a) A semiconductor device used mainly on AC power applications that
has surge ratings ranging from a few hundred to many thousands of amps.
Which surge protection component has a surge rating of several thousand amps?
a) Metal Oxide Varistor (MOV)
b) Gas Discharge Tubes (GDT)
c) Zener Diode
d) Hybrid Circuit
Answer: b) Gas Discharge Tubes (GDT)
Which surge protection component is used for accurate clamping of surge
voltages?
a) Metal Oxide Varistor (MOV)
b) Gas Discharge Tubes (GDT)
c) Zener Diode
d) Hybrid Circuit
Answer: c) Zener Diode
What is inrush current?
a) The maximum voltage that an electrical appliance can handle
b) The peak instantaneous current drawn by an electrical appliance when it is first
turned on
c) The steady state current drawn by an electrical appliance
d) The maximum frequency that an electrical appliance can handle
Answer: b) The peak instantaneous current drawn by an electrical appliance
when it is first turned on
What is an inrush current limiter used for?
a) To increase the peak instantaneous current drawn by an electrical appliance
b) To decrease the peak instantaneous current drawn by an electrical appliance
c) To increase the steady state current drawn by an electrical appliance
d) To decrease the steady state current drawn by an electrical appliance
Answer: b) To decrease the peak instantaneous current drawn by an electrical
appliance
What is the purpose of lightning protection?
a) To prevent damage to electrical appliances from lightning strikes
b) To provide a direct path for lightning bolts to follow to ground
c) To prevent electrical fires in buildings during lightning storms
d) To generate electricity from lightning strikes
Answer: b) To provide a direct path for lightning bolts to follow to ground
What are vertical lightning rods also called?
a) Surge protectors
b) Air terminals
c) Lightning arresters
d) Grounding rods
Answer: b) Air terminals
What is a hazardous location?
a) A location where there is a high risk of electric shock
b) A location where there is a high risk of fire or explosion hazards
c) A location where there is a high risk of earthquakes
d) A location where there is a high risk of flooding
Answer: b) A location where there is a high risk of fire or explosion hazards
What is the difference between explosion-proof and explosion-resistant
equipment?
a) Explosion-resistant equipment is designed to withstand an explosion, while
explosion-proof equipment is designed to prevent the ignition of a specified gas or
vapor surrounding the enclosure.
b) Explosion-proof equipment is designed to withstand an explosion, while
explosion-resistant equipment is designed to prevent the ignition of a specified
gas or vapor surrounding the enclosure.
c) Explosion-proof equipment is designed to prevent the ignition of an explosive
or flammable material, while explosion-resistant equipment is designed to
withstand an explosion.
d) Explosion-resistant equipment is designed to prevent the ignition of an
explosive or flammable material, while explosion-proof equipment is designed to
withstand an explosion.
What is the primary function of a hybrid circuit in surge protection?
a) To provide a direct path for lightning bolts to follow to ground
b) To reduce inrush current
c) To accurately clamp surge voltages
d) To combine different types of surge protection components to take advantage
of each component’s strengths
Answer: d) To combine different types of surge protection components to take
advantage of each component’s strengths
What is the maximum spacing between vertical lightning rods on a protected
structure?
A) 10 ft B) 20 ft C) 30 ft D) 40 ft
Answer: b
T, N, H, HH, and W are conductor insulation designations that specify the type of
insulation material used to cover electrical conductors.
TA) Teflon insulation
B) Thermoplastic insulation
C) Thermosetting insulation D) Tri-rated insulation
Answer: b
NA) Nylon insulation
B) Neoprene insulation
C) Natural rubber insulation D) Nitrite insulation
Answer: a
HA) Heat-resistant thermoplastic insulation
thermosetting insulation
C) High-voltage insulation
Answer: a
B) High-temperature
D) Halogen-free insulation
HH A) Halogen-free insulation B) High heat-resistant thermoplastic insulation
C) Heavy-duty thermosetting insulation
D) High-voltage insulation
Answer: b
WA) Water-resistant insulation B) Weather-resistant thermoplastic insulation
C) Welding-grade insulation D) Wear-resistant insulation
Answer: b
With respect to conductors, interpret the following designations:
THHN, THWN, XHHW, AL, CU
THHN:
a. Thermoplastic High Heat-resistant Nylon-coated
b. Thermoset Heat-resistant Nylon-coated
c. Thermoplastic Heat-resistant Nylon-coated
d. Thermoset High Heat-resistant Nylon-coated
Answer: c. Thermoplastic Heat-resistant Nylon-coated
THWN:
a. Thermoplastic High Heat-resistant Wet-rated Nylon-coated
b. Thermoset Heat-resistant Wet-rated Nylon-coated
c. Thermoplastic Heat-resistant Wet-rated Nylon-coated
d. Thermoset High Heat-resistant Wet-rated Nylon-coated
Answer: c. Thermoplastic Heat-resistant Wet-rated Nylon-coated
XHHW:
a. Cross-linked Heat-resistant High Water-resistant
b. Cross-linked High Heat-resistant Water-resistant
c. Cross-linked Heat-resistant High Weather-resistant
d. Cross-linked High Heat-resistant Weather-resistant
Answer: b. Cross-linked High Heat-resistant Water-resistant
AL:
a. Aluminum
b. Alloy
c. All-weather
d. American
Answer: a. Aluminum
CU:
a. Copper
b. Coaxial
c. Control Unit
d. Current Unit
Answer: a. Copper
With respect to cable, interpret the following designations:
What does NM cable stand for?
a. Non-Metallic
b. National Manufacturer
c. Neutral-Mounted
d. Non-Magnetic
Answer: a. Non-Metallic
What does ACTH cable stand for?
a. Armored Cable Thermoplastic Heat Resistant
b. Advanced Coaxial Transmission Harness
c. Automotive Control Temperature and Humidity
d. All Copper Twisted Helix
Answer: a. Armored Cable Thermoplastic Heat Resistant
What does UF cable stand for?
a. Underground Feeder
b. Universal Fiber
c. Unshielded Flexible
d. Ultra-Fast
Answer: a. Underground Feeder
What does USE cable stand for?
a. Underground Service Entrance
b. Utility Service Electrical
c. Unshielded Single-Phase Electric
d. Universal Solar Energy
Answer: a. Underground Service Entrance
With respect to conductor insulation, describe the following location ratings:
Dry: A location where no moisture is present, such as indoors or in a dry
environment. Examples include a residential living room or an office building.
Multiple Choice:
A) Location where water is present
B) Location where no moisture is present
C) Location with high humidity levels
D) Location where the temperature is below freezing
Answer: B) Location where no moisture is present
Damp: A location where moisture is present but not in quantities to cause
saturation or accumulation. Examples include a bathroom, a garage, or a covered
outdoor area.
Multiple Choice:
A) Location where water is present
B) Location where no moisture is present
C) Location with high humidity levels
D) Location where the temperature is below freezing
Answer: C) Location with high humidity levels
Wet: A location where moisture is present in quantities sufficient to cause
saturation or accumulation. Examples include outdoor areas exposed to rain or
areas subject to water immersion such as swimming pools, fountains, or sewer
systems.
Multiple Choice:
A) Location where water is present
B) Location where no moisture is present
C) Location with high humidity levels
D) Location where the temperature is below freezing
Answer: A) Location where water is present
What type of electrical wire is best used for residential electrical wiring?
A. Solid wire B. Stranded wire C. Twisted pair wire D. Coaxial wire
Answer: B. Stranded wire
What is the standard voltage rating for residential electrical systems in the US?
A. 120V B. 220V C. 240V D. 480V
Answer: C. 240V
What type of circuit breaker trips when the current exceeds its rating for a certain
period of time?
A. Magnetic circuit breaker B. Thermal circuit breaker C. Ground fault circuit
breaker
D. Arc fault circuit breaker
Answer: B. Thermal circuit breaker
What type of electrical conduit is typically used in exposed outdoor applications?
A. PVC conduit B. EMT conduit C. RMC conduit D. IMC conduit
Answer: A. PVC conduit or C. RMC conduit
Which of the following is NOT a type of electrical outlet commonly used in
residential applications?
A. NEMA 5-15R B. NEMA 6-20R C. NEMA 10-30R D. NEMA 14-50R
Answer: C. NEMA 10-30R
What is the minimum height above a finished floor for an electrical receptacle in a
residential application?
A. 12 inches B. 16 inches C. 18 inches D. 24 inches
Answer: C. 18 inches
Which of the following is a common type of residential lighting fixture?
A. Recessed light B. High bay light C. Fluorescent light D. Metal halide light
Answer: A. Recessed light
What type of electrical switch is typically used to control a ceiling fan?
A. Single-pole switch B. Double-pole switch C. Three-way switch D. Four-way
switch
Answer: C. Three-way switch
What is the minimum size conductor required for a 30-amp circuit?
A. 10 AWG B. 12 AWG C. 14 AWG D. 16 AWG
Answer: A. 10 AWG
What is the maximum overcurrent protection for 12-gauge copper wire?
A. 15 amps B. 20 amps C. 25 amps D. 30 amps
Answer: B. 20 amps
What is the purpose of the National Electrical Code (NEC)?
a) To establish basic materials quality and electrical works standards
b) To protect people and property from hazards arising from the use of electricity
c) To represent the interests of electrical manufacturers
Answer: b) To protect people and property from hazards arising from the use of
electricity
What is the primary objective of the Philippine Electrical Code (PEC)?
a) To establish basic materials quality and electrical works standards
b) To represent the interests of electrical manufacturers
c) To prevent electrical fires
Answer: a) To establish basic materials quality and electrical works standards
What does an approved electrical product mean?
a) It meets minimum safety standards as determined by extensive testing by an
independent testing company or organization
b) It is the cheapest product on the market
c) It has the most features and functions
Answer: a) It meets minimum safety standards as determined by extensive
testing by an independent testing company or organization.
What is the purpose of requiring an electrical license?
A) To limit the number of electricians in a given area.
B) To protect the consumer against unskilled electricians.
C) To increase the cost of electrical installations.
Answer: B) To protect the consumer against unskilled electricians.
What is the purpose of a permit for an electrical installation project?
A) To delay the project.
B) To increase the cost of the project.
C) To ensure the project meets local codes and standards.
Answer: C) To ensure the project meets local codes and standards.
When are inspections typically conducted during an electrical installation project?
A) Only at the beginning of the project.
B) After all the fixtures and devices are installed.
C) Both during and after the installation, depending on the phase of the project.
Answer: C) Both during and after the installation, depending on the phase of the
project.
What is the purpose of electrical construction drawings?
a) To show the layout and design of a building's plumbing system
b) To convey design information to the contractor
c) To provide instructions on how to operate the building's HVAC system
Answer: b) To convey design information to the contractor
What are the drawbacks of using voltages higher than 600 V?
a) Heavy insulation and conductor shielding are needed
b) They are more dangerous
c) Both a and b
Answer: c
Which of the following is typically included in a lighting floor plan?
a) Labeling criteria of all electrical equipment
b) Electrical wiring devices
c) Electrical circuits indicating conduit and wiring sizes
Answer: c) Electrical circuits indicating conduit and wiring sizes
What is the advantage of higher voltage in a circuit?
a) A circuit can carry more current
b) A circuit can carry less current
c) A circuit's voltage drop will be lower
Answer: a
What does a symbol schedule and diagram show?
a) The locations of all electrical equipment in the building
b) The labeling criteria of all electrical equipment
c) The symbols used on the construction drawings and their meanings
Answer: c) The symbols used on the construction drawings and their meanings
What is the function of an ungrounded conductor?
a) To provide a path for the return current
b) To carry the current back to the source
c) To carry the current from the source to the load
Answer: c
Which of the following is included in the requirements for electrical installation?
a) Plumbing fixtures and fittings
b) Circuit and motor disconnects
c) Masonry walls and details
Answer: b) Circuit and motor disconnects
What is the function of a neutral conductor?
a) To provide a path for the return current
b) To carry the current back to the source
c) To provide a ground reference for the circuit
Answer: b
What is the purpose of a lighting fixture schedule?
a) To show the locations of all exit signs in the building
b) To indicate the types and quantities of lighting fixtures required
c) To provide instructions on how to install lighting fixtures
Answer: b) To indicate the types and quantities of lighting fixtures required
What is the function of a grounding conductor?
a) To provide a path for the return current
b) To carry the current from the source to the load
c) To provide a ground reference for the circuit
Answer: c
What does a power floor plan typically show?
a) The locations of all electrical equipment in the building
b) The labeling criteria of all electrical equipment
c) Electrical circuits indicating conduit and wiring sizes, equipment, and
disconnect switches
Answer: c) Electrical circuits indicating conduit and wiring sizes, equipment, and
disconnect switches
What determines the availability of a particular system voltage?
a) The building design
b) The type of wiring used
c) Utility lines and equipment at or near the building site
Answer: c
What is a nominal voltage?
a) The exact voltage delivered by the utility company
b) The target voltage entering the service panel
c) The maximum voltage that can be delivered by a circuit
Answer: b
Why do supply voltages vary from nominal voltage?
a) Due to load variation
b) Due to changes in conditions at the utility power system
c) Both a and b
Answer: c
Which conductor is also known as the hot or live conductor in an AC system?
a) Grounding conductor
b) Neutral conductor
c) Ungrounded conductor
Answer: c) Ungrounded conductor
What happens when an ungrounded conductor is grounded in a single-phase
circuit?
a) It causes a short circuit
b) It results in an open circuit
c) It creates a closed circuit
Answer: c) It creates a closed circuit
Which conductor is required to complete a single-phase circuit by connecting the
ungrounded (hot) conductor to ground?
a) Grounding conductor
b) Neutral conductor
c) Ungrounded conductor
Answer: b) Neutral conductor
What does the neutral conductor carry in a single-phase circuit?
a) Unbalanced load between two ungrounded conductors
b) Ground fault current
c) Supplementary grounding protection
Answer: a) Unbalanced load between two ungrounded conductors
Which conductor is not normally a current-carrying conductor?
a) Grounding conductor
b) Neutral conductor
c) Ungrounded conductor
Answer: a) Grounding conductor
When is the grounding conductor energized in a circuit?
a) During normal operation
b) Only on a temporary, emergency basis during a fault
c) Whenever the circuit is turned off
Answer: b) Only on a temporary, emergency basis during a fault
What is the correct name for the conductor that is often confused with a
"ground"?
a) Grounded conductor
b) Neutral conductor
c) Grounding conductor
Answer: c) Grounding conductor
In a simple single-phase circuit, what is the role of the grounded conductor?
a) To provide power to the load
b) To provide a path from the load back to the power source
c) To carry the unbalanced load
Answer: b) To provide a path from the load back to the power source
What is the voltage in a single-phase circuit?
a) Equal to the voltage on the grounded conductor
b) Double the voltage on the ungrounded conductor
c) Equal to the voltage on the ungrounded conductor
Answer: c) Equal to the voltage on the ungrounded conductor
What is the voltage in a circuit with two ungrounded conductors in a single-phase
circuit?
a) Equal to the voltage on each ungrounded conductor
b) Double the voltage on each ungrounded conductor
c) Triple the voltage on each ungrounded conductor
Answer: b) Double the voltage on each ungrounded conductor
What is the highest voltage to which a wiring device can be exposed?
a) Line voltage
b) Maximum voltage
c) Utilization voltage
d) System voltage
Answer: b) Maximum voltage
What is the purpose of a grounded conductor in a circuit?
a) To complete the circuit by connecting the ungrounded (hot) conductor to
ground
b) To serve as a current carrying conductor
c) To perform the function of a neutral conductor
d) None of the above
Answer: b) To serve as a current carrying conductor
What is the function of a neutral conductor in a circuit?
a) To complete the circuit by connecting the ungrounded (hot) conductor to
ground
b) To perform the function of a grounded conductor
c) To provide a return path back to the circuit's power source
d) None of the above
Answer: c) To provide a return path back to the circuit's power source
When should grounded and neutral conductors be wired so that a circuit breaker,
fuse, or switch does not interrupt them?
a) Always
b) Never
c) Only in certain situations
d) It doesn't matter
Answer: a) Always
What is load balancing?
a) Dividing loads as unevenly as possible between the ungrounded conductors
b) Dividing loads as evenly as possible between the ungrounded conductors
c) Overloading one ungrounded conductor while leaving the other unused
d) None of the above
Answer: b) Dividing loads as evenly as possible between the ungrounded
conductors
What is the purpose of load balancing?
a) To create an unbalanced load
b) To protect against the danger of electricity
c) To cause circuits to trip
d) None of the above
Answer: b) To protect against the danger of electricity
What is the function of a neutral conductor in a multiwire circuit?
a) To serve as the grounded leg of the circuit
b) To complete the circuit by connecting the ungrounded (hot) conductor to
ground
c) To provide a return path back to the circuit's power source
d) To perform the function of a grounded conductor
Answer: d) To perform the function of a grounded conductor
What is the purpose of a shared neutral or common neutral?
a) To perform the function of a grounded conductor for at least two ungrounded
(hot) conductors that have sources from different voltage phases
b) To complete the circuit by connecting the ungrounded (hot) conductor to
ground
c) To provide a return path back to the circuit's power source
d) None of the above
Answer: a) To perform the function of a grounded conductor for at least two
ungrounded (hot) conductors that have sources from different voltage phases
What is the minimum length of electrically conductive steel reinforcing bars or
bare copper wire required for an electrode encased in concrete?
a. 10 ft (3 m)
b. 20 ft (6 m)
c. 30 ft (9 m)
d. 40 ft (12 m)
Answer: b. 20 ft (6 m)
What is an electrode made of a steel or iron plate required to have in terms of
surface area in contact with exterior soil?
a. 1 ft2 (0.1 m2)
b. 2 ft2 (0.2 m2)
c. 3 ft2 (0.3 m2)
d. 4 ft2 (0.4 m2)
Answer: b. 2 ft2 (0.2 m2)
Which of the following is an example of noncurrent-carrying metal components of
equipment?
a. Outlet boxes
b. Circuit breakers
c. Transformers
d. Motor windings
Answer: a. Outlet boxes
What is the purpose of double insulation in an appliance or power tool?
a. To reduce energy consumption
b. To increase its durability
c. To protect the user from electric shock
d. To enhance its performance
Answer: c. To protect the user from electric shock
What is the typical rating range of a panelboard for a residential system?
a. 10 to 50 A
b. 50 to 100 A
c. 100 to 200 A
d. 200 to 400 A
Answer: c. 100 to 200 A
Where is the panelboard located in each dwelling unit in a multifamily dwelling?
a. At a remote area of the building
b. Outside of the building
c. In a common area
d. None of the above
Answer: a. At a remote area of the building
What is the typical voltage rating of a three-wire, single-phase service entrance
for a residential system?
a. 120/240 V
b. 208 V
c. 277 V
d. 480 V
Answer: a. 120/240 V
What is the function of a feeder in a residential system?
a. To bring power from the utility transformer to the building service equipment
b. To distribute power throughout the residence
c. To extend power from the main panelboard to one or more sub panelboards
d. To feed outlets within the unit
Answer: c. To extend power from the main panelboard to one or more sub
panelboards.
Where is a transformer vault typically located in a large building?
a) On the roof
b) In the basement or ground level
c) On an upper floor
Answer: b) In the basement or ground level
What equipment can be found in a transformer vault?
a) Electrical outlets and switches
b) Light fixtures and wiring
c) Power transformers, circuit breakers, meters, and voltage regulators
Answer: c) Power transformers, circuit breakers, meters, and voltage regulators.
What is an electric conductor?
a) A material that resists the flow of electric current
b) A substance that allows the flow of electric current
c) A device that measures electric current
Answer: b) A substance that allows the flow of electric current
Which of the following is a good conductor of electricity?
a) Plastic
b) Rubber
c) Copper
Answer: c) Copper
How is power distributed throughout a residence in a typical residential system?
a. Through feeders
b. Through branch circuits
c. Through distribution panels
d. Through transformers
Answer: b. Through branch circuits
What are insulators?
a) Materials that allow the flow of electric current
b) Materials that resist the flow of electric current
c) Devices that measure electric current
Answer: b) Materials that resist the flow of electric current
What type of dwelling unit has power divided at a main distribution panel and is
distributed to individual units through feeders?
a. Single-family residence b. Multifamily dwelling
c. Commercial building
d. Industrial facility
Answer: b. Multifamily dwelling
What is the purpose of conductor insulation?
a) To increase the flow of electric current
b) To decrease the flow of electric current
c) To serve as a physical shield of the wire against external elements
Answer: c) To serve as a physical shield of the wire against external elements
Which material is not a type of insulator?
a) Rubber
b) Porcelain
c) Aluminum
Answer: c) Aluminum
What is ampacity?
a) The ability of the wire to resist overheating
b) The ability of the wire to carry current without overheating
c) The ability of the wire to measure current
Answer: b) The ability of the wire to carry current without overheating
How is conductor ampacity determined?
a) By the amount of current it can carry without heating
b) By the amount of voltage it can withstand
c) By the amount of current it can measure
Answer: a) By the amount of current it can carry without heating
What is the temperature correction factor for conductors?
a) A factor applied based on the ambient temperature of the conductor
b) A factor applied based on the length of the conductor
c) A factor applied based on the number of conductors in a raceway
Answer: a) A factor applied based on the ambient temperature of the conductor
When is a bundling correction factor applied?
a) When conductors are installed in a conduit
b) When there are four or more conductors in a raceway or cable
c) When the ambient temperature is high
Answer: b) When there are four or more conductors in a raceway or cable
What is the bundling correction factor for 10 through 20 conductors in a raceway
or cable?
a) 0.80
b) 0.70
c) 0.50
Answer: c) 0.50
What is the basic formula for determining voltage drop in a two-wire AC circuit?
a) Edrop = (L x R) / I
b) Edrop = L + R - I
c) Edrop = I / (L + R)
d) Edrop = (I x R) / L
Answer: a) Edrop = (L x R) / I
What is the percentage of voltage drop determined by in relation to the system
voltage?
a) the sum of voltage drop and system voltage
b) the difference between voltage drop and system voltage
c) the ratio of voltage drop and system voltage
d) the product of voltage drop and system voltage
Answer: c) the ratio of voltage drop and system voltage
What are the materials that can be used to enclose building wiring?
a) Cables, raceways, enclosures, and panels
b) Conduits, tubing, wireways, and boxes
c) Wires, fixtures, appliances, and panels
d) Metal, plastic, wood, and glass
Answer: b) Conduits, tubing, wireways, and boxes
Which type of branch circuit supplies two or more outlets for lighting and
appliances?
a. General purpose branch circuit
b. Individual branch circuit
c. Appliance branch circuit
Answer: a
What is the maximum number of conductors allowed in conduit or tubing for
THWN or THHN insulation?
a) It varies depending on the insulation type
b) It is unlimited
c) It is limited by code and varies depending on the insulation type
d) It is determined by the manufacturer of the conduit or tubing
Answer: c) It is limited by code and varies depending on the insulation type
What is a multiwire branch circuit?
a. A branch circuit that supplies energy to one or more outlets to which
appliances are to be connected
b. A branch circuit consisting of two or more ungrounded (hot) conductors having
a voltage between them and a common neutral (grounded) conductor that is
shared between the ungrounded conductors
c. A branch circuit that serves only one receptacle or piece of equipment
Answer: b
What is the purpose of an electrical box?
a) To protect electrical connections
b) To hide electrical connections
c) To hold electrical equipment
d) To prevent electrical currents
Answer: a) To protect electrical connections
What is an outlet in a wiring system?
a. The point in the wiring system where current is taken to supply an appliance or
equipment
b. The point in the wiring system where the circuit breaker is located
c. The point in the wiring system where the main grounding wire is connected
Answer: a
What must be done to ensure that conductors in an electrical box do not
overheat?
a) Increase the number of conductors in the box
b) Reduce the number of conductors in the box
c) Provide adequate open air space
d) Increase the insulation rating of the conductors
Answer: c) Provide adequate open air space
Which type of circuit is sometimes known in the trade as a dedicated or special
purpose circuit?
a. General purpose branch circuit
b. Individual branch circuit
c. Appliance branch circuit
Answer: b
What is a branch circuit?
a. The portion of the building wiring system that extends beyond the final
overcurrent protection device
b. The portion of the building wiring system that extends beyond the main circuit
breaker
c. The portion of the building wiring system that extends beyond the first outlet
Answer: a
Which type of branch circuit serves only one receptacle or piece of equipment?
a. General purpose branch circuit
b. Individual branch circuit
c. Appliance branch circuit
Answer: b
What is the maximum amperage for an appliance branch circuit?
a. 30 A b. 20 A c. 15 A
Answer: b
Which type of branch circuit supplies fixed electric equipment such as
refrigerators and washers?
a. General purpose branch circuit
b. Individual branch circuit
c. Appliance branch circuit
Answer: c
What is the common neutral conductor in a multiwire branch circuit?
a. A grounded conductor
b. An ungrounded conductor
c. A bonding conductor
Answer: a
In which type of facility are multiwire branch circuits required?
a. Shopping malls
b. Hospitals, nursing homes, and dental facilities
c. Office buildings
Answer: b
What is a life safety branch circuit?
a) A circuit used for general lighting and receptacles
b) A circuit that automatically connects to an alternate power source in
emergencies
c) A circuit that is used for critical care equipment only
Answer: b
What is the load limit for convenience receptacles in commercial applications?
a) 1.5 A (180 VA) per receptacle
b) 2.5 A (300 VA) per receptacle
c) 3.5 A (420 VA) per receptacle
Answer: a
What is a critical branch circuit used for?
a) General purpose lighting
b) Powering task illumination, special power circuits, and selected receptacles
serving areas related to patient care
c) Feeding fixed appliances and luminaires
Answer: b
What happens to a life safety branch circuit when the normal power source is
interrupted?
a) It continues to provide power from the normal power source
b) It automatically connects to an alternate power source such as a generator
c) It shuts off completely
Answer: b
What is a split wiring receptacle?
a) A receptacle that is fed by a 120/240 V circuit
b) A receptacle that has two ungrounded (hot) conductors and a grounded
(neutral) conductor
c) A receptacle that allows power to be drawn from two separate circuits
d) All of the above
Answer: d
Which of the following appliances typically requires an individual circuit?
a) Microwave
b) Toaster
c) Blender
d) All of the above
Answer: a) Microwave
What determines the rating of a branch circuit?
a) The connected load
b) The overcurrent protection device
c) The wiring used in the circuit
Answer: b
What is the purpose of a general purpose circuit?
a) To provide power to task illumination and special power circuits
b) To feed more than one outlet for lighting or other purposes
c) To provide power to portable appliances only
Answer: b
What is the maximum theoretical load for a 20 A, 120 V branch circuit?
a) 20 A
b) 2400 VA
c) 1920 VA
Answer: b
What is the maximum connected load for a continuous operating load on a 15 A
branch circuit?
a) 15 A
b) 12 A and 1440 VA
c) 16 A and 1920 VA
Answer: b
What is the limit for any one portable appliance on a general purpose circuit?
a) 80% of the branch circuit rating
b) 50% of the branch circuit rating
c) 100% of the branch circuit rating
Answer: a
How many small appliance circuits are required for convenience receptacle
outlets in dwelling unit kitchens?
a) 1
b) 2
c) 3
d) 4
Answer: b) 2
Which type of branch circuit provides power to patients and personnel during
emergencies?
a) General Purpose Circuit
b) Appliance Circuit
c) Life Safety Branch Circuit
d) Critical Branch Circuit
Answer: c) Life Safety Branch Circuit
What is the purpose of an individual circuit?
a) To provide power to multiple outlets
b) To provide power to a single outlet
c) To provide power to small appliances
d) To provide power to critical equipment
Answer: b) To provide power to a single outlet
What is a continuous load?
a) A load that operates for 2 hours
b) A load that operates for 3 hours or more
c) A load that operates for 4 hours
Answer: b) A load that operates for 3 hours or more
Which loads can be classified as continuous loads?
a) Circuits serving office and classroom lighting installations
b) Appliances in a home kitchen
c) Computers in a commercial building
Answer: a) Circuits serving office and classroom lighting installations
What is the minimum conductor ampacity for a branch circuit?
a) Can be smaller than the circuit rating
b) Must be larger than the circuit rating
c) Must be at least the branch circuit rating
Answer: c) Must be at least the branch circuit rating
What is the most widely used wiring method in residential dwellings?
a) Type MC cable
b) Type NMC cable
c) Type NMB cable
Answer: c) Type NMB cable
What is the minimum conductor insulation rating for NM cable?
a) 60°F (16°C)
b) 90°F (32°C)
c) 194°F (90°C)
Answer: c) 194°F (90°C)
What type of cable is used for electrical ranges, cooktops, wall ovens, and clothes
dryers?
a) Type NMB cable
b) Type MC cable
c) Type SER or other four-wire cable
Answer: c) Type SER or other four-wire cable
What is designated by a "B" on the cable sheath of NM cable?
a) The type of insulation used
b) The voltage rating of the cable
c) The conductor ampacity of the cable
Answer: a) The type of insulation used
What is the purpose of an overcurrent protection (OCP) device?
a) To increase current levels in a conductor
b) To interrupt power when current limitations are exceeded
c) To allow excessive heat to damage conductors and equipment
d) None of the above
Answer: b) To interrupt power when current limitations are exceeded
What is the standard mounting height for wall switches?
a) Approximately 48 in AFF
b) Approximately 16 in AFF
c) Approximately 44 in AFF
d) None of the above
Answer: a) Approximately 48 in AFF
What is the most widely used wiring method in residential dwellings?
a) Type NM cable
b) Type SE cable
c) Type SER cable
d) Type NMB cable
Answer: d) Type NMB cable
What is the purpose of a feeder?
a) To limit current levels in a conductor
b) To distribute power from the service equipment to a subpanelboard
c) To interrupt power when current limitations are exceeded
d) None of the above
Answer: b) To distribute power from the service equipment to a subpanelboard
What is the minimum rating requirement for panelboards used as service
equipment?
a) Not less than the minimum allowable service capacity of the computed load
b) Not less than the minimum feeder capacity of the computed load
c) Not less than the maximum allowable service capacity of the computed load
d) None of the above
Answer: a) Not less than the minimum allowable service capacity of the computed
load
What is the maximum operating time for a continuous load?
a) 1 hr b) 2 hr c) 3 hr d) 4 hr
Answer: c) 3 hr
What is the conductor insulation rating requirement for NM cable?
a) 90°F (32°C)
b) 194°F (90°C)
c) 250°F (121°C) d) None of the above
Answer: b) 194°F (90°C)
What must the overcurrent protection device protect in a circuit?
a) The grounded conductor
b) The grounding conductor
c) The ungrounded conductors
d) All of the above
Answer: c) The ungrounded conductors
What is the most common size of residential service equipment used?
a) 50 A b) 75 A c) 100 A d) 125 A
Answer: c) 100 A
What are the commonly used aluminum conductors in service equipment?
a) RHW and THWN
b) THHN and XHHW
c) USE and THHN
d) RHW and XHHW
Answer: d) RHW and XHHW
What is the required clear area in front of all service equipment and electrical
panels?
a) 12 in wide and 24 in deep
b) 24 in wide and 36 in deep
c) 30 in wide and 36 in deep
d) 36 in wide and 48 in deep
Answer: c) 30 in wide and 36 in deep
What is the required minimum vertical clearance above sidewalks for service
entrance equipment?
a) 8 ft
b) 10 ft c) 12 ft d) 18 ft
Answer: b) 10 ft
Which transformer combination is used in large commercial buildings and
industrial facilities?
a) Y-Y b) ∆-∆
c) ∆-Y
d) Y-∆
Answer: b) ∆-∆
When were tamper-resistant receptacles required to be installed in hospital
pediatric areas?
a) In the last decade
b) Nearly three decades ago
c) More than five decades ago
d) More than eight decades ago
Answer: b) Nearly three decades ago
What is the minimum height required for the letters "TR" on tamper-resistant
receptacles?
a) 1/16 in
b) 1/8 in
c) 3/16 in
d) 1/4 in
Answer: c) 3/16 in
When did the NEC introduce requirements for the use of GFCI in residences?
a) 1970 b) 1973 c) 1980 d) 1990
Answer: b) 1973
Which convenience outlets were required to have GFCI protection in the 1975
edition of the NEC?
a) Bathroom convenience outlets
b) Kitchen convenience outlets
c) Laundry convenience outlets
d) Outdoor convenience outlets
Answer: a) Bathroom convenience outlets
Which convenience outlets were included in the 1996 edition of the NEC to
require GFCI protection?
a) Kitchen convenience outlets that serve countertops
b) Laundry convenience outlets
c) Convenience outlets in unfinished basements and crawl spaces
d) Convenience outlets within 6 ft of wet bar sink
Answer: a) Kitchen convenience outlets that serve countertops, including islands.
Where are GFCI outlets required to be installed?
a) Only in dwelling units
b) In all types of buildings
c) Only in commercial buildings
Answer: b) In all types of buildings
Which of the following locations requires GFCI protection?
a) Residential living rooms b) Commercial kitchens
c) Residential bathrooms
Answer: b) Commercial kitchens
Which type of buildings require GFCI protection?
a) Only dwelling units
b) Only commercial buildings
c) Nondwelling type buildings
Answer: c) Nondwelling type buildings
What is the purpose of AFCI protection?
a) To prevent electrocution b) To prevent fires caused by arc faults
c) To prevent electrical shocks caused by lightning strikes
Answer: b) To prevent fires caused by arc faults
Where are AFCIs required to be installed in new residential construction?
a) In all rooms
b) Only in bedrooms
c) Only in bathrooms
Answer: b) Only in bedrooms
Which of the following buildings may benefit from retrofitting AFCI protection?
a) Buildings wired with solid copper conductors
b) Buildings with newly installed wiring systems
c) Buildings wired with solid aluminum conductors from the late 1960s and early
1970s
Answer: c) Buildings wired with solid aluminum conductors from the late 1960s
and early 1970s
What is the first step in designing an electrical system for a building?
a) Choosing the type of equipment to be used
b) Discussing future expansion plans with the owner
c) Determining the available electrical service at the site
d) Reviewing the location of mechanical equipment
Answer: c) Determining the available electrical service at the site
What information does the designer need from the owner in order to design an
electrical system?
a) The size of the building
b) The types and locations of equipment and appliances that require electricity
c) The location of windows and doors
d) The number of floors in the building
Answer: b) The types and locations of equipment and appliances that require
electricity
What is the purpose of working with the architectural designer in locating
electrical equipment and appliances on the floor plan?
a) To ensure that the building meets governmental regulations
b) To minimize the cost of the electrical system
c) To ensure that the equipment is easily accessible
d) To ensure that the electrical system meets the needs of the building occupant
Answer: d) To ensure that the electrical system meets the needs of the building
occupant
What should the designer review with the architect in designing the electrical
system?
a) The location of furniture in the building
b) The location of the service entrance equipment and power panels
c) The type of flooring to be used in the building
d) The color scheme of the building
Answer: b) The location of the service entrance equipment and power panels
What should the designer discuss with the owner regarding future plans for the
building?
a) Any future expansion plans or equipment requirements
b) Any changes to the building's color scheme
c) The location of furniture in the building
d) The type of flooring to be used in the building
Answer: a) Any future expansion plans or equipment requirements
What guides the designer to a good solution in electrical design?
a) Following industry trends
b) Applying electrical systems theory and Code requirements
c) Designing a system that is cost-effective
d) Designing a system that meets the owner's personal preferences
Answer: b) Applying electrical systems theory and Code requirements
What is the first step in designing an electrical system for a building?
a) Choosing the type of equipment to be used
b) Discussing future expansion plans with the owner
c) Determining the available electrical service at the site
d) Reviewing the location of mechanical equipment
Answer: c) Determining the available electrical service at the site
What information does the designer need from the owner in order to design an
electrical system?
a) The size of the building
b) The types and locations of equipment and appliances that require electricity
c) The location of windows and doors
d) The number of floors in the building
Answer: b) The types and locations of equipment and appliances that require
electricity
What is the purpose of working with the architectural designer in locating
electrical equipment and appliances on the floor plan?
a) To ensure that the building meets governmental regulations
b) To minimize the cost of the electrical system
c) To ensure that the equipment is easily accessible
d) To ensure that the electrical system meets the needs of the building occupant
Answer: d) To ensure that the electrical system meets the needs of the building
occupant
What should the designer review with the architect in designing the electrical
system?
a) The location of furniture in the building
b) The location of the service entrance equipment and power panels
c) The type of flooring to be used in the building
d) The color scheme of the building
Answer: b) The location of the service entrance equipment and power panels
What should the designer discuss with the owner regarding future plans for the
building?
a) Any future expansion plans or equipment requirements
b) Any changes to the building's color scheme
c) The location of furniture in the building
d) The type of flooring to be used in the building
Answer: a) Any future expansion plans or equipment requirements
How many separate wall-switched plug-in positions should be provided if general
illumination is to be provided from portable lamps?
a) One
b) Two
c) Three
d) Four
Answer: b) Two
What guides the designer to a good solution in electrical design?
a) Following industry trends
b) Applying electrical systems theory and Code requirements
c) Designing a system that is cost-effective
d) Designing a system that meets the owner's personal preferences
Answer: b) Applying electrical systems theory and Code requirements
What type of outlet may be required for a fireplace?
a) GFCI outlet
b) AFCI outlet
c) Weatherproof outlet
d) Standard outlet
Answer: d) Standard outlet
What type of convenience receptacles should be used to minimize the risk of
shock from short circuits?
a) Non-grounding type
b) Grounding type
c) AFCI type
d) GFCI type
Answer: b) Grounding type
What type of detector/alarm should be installed on a 120 V circuit?
a) Carbon monoxide detector
b) Heat detector
c) Smoke detector/alarm
d) Gas detector
Answer: c) Smoke detector/alarm
In which areas should GFCI protection be installed on convenience receptacles?
a) Bedrooms
b) Living rooms
c) Dining areas
d) Areas where occupants are exposed to water
Answer: d) Areas where occupants are exposed to water
Where should wall switches be located?
a) In the center of the room
b) Near the entrance of the room
c) Near the ceiling
d) Near the floor
Answer: b) Near the entrance of the room
What is the maximum distance that convenience receptacles in habitable spaces
should be located from any usable wall space?
a) 2 ft (0.6 m)
b) 4 ft (1.2 m)
c) 6 ft (1.8 m)
d) 8 ft (2.4 m)
Answer: c) 6 ft (1.8 m)
What type of protection is required for outdoor receptacles?
a) AFCI protection
b) GFCI protection
c) Surge protection
d) Overload protection
Answer: b) GFCI protection
What is the recommended number of small appliance circuits for kitchen
countertops?
A) One 20 A circuit
B) Two 20 A circuits
C) Three 20 A circuits
D) Four 20 A circuits
Answer: B) Two 20 A circuits
Which kitchen convenience receptacles should be connected to small appliance
circuits?
A) Only those behind the refrigerator
B) Only those serving fixed appliances
C) Only those serving the dining room area
D) Those serving countertop areas except behind the refrigerator and those
serving fixed appliances
Answer: D) Those serving countertop areas except behind the refrigerator and
those serving fixed appliances
Which of the following is a requirement for lighting design in bedrooms?
a) Lighting outlets should be uncontrolled
b) Lighting outlets should be controlled by motion sensors
c) General illumination should be provided from either ceiling or wall outlets,
controlled by one or more wall switches
d) Lighting outlets should be controlled by voice command
Answer: c) General illumination should be provided from either ceiling or wall
outlets, controlled by one or more wall switches
How many convenience receptacles should be placed near each probable
individual bed location?
a) None
b) One
c) Two
d) Three
Answer: c) Two
What type of receptacle should be provided within 3 ft of the outside edge of each
lavatory basin?
a) Standard receptacle
b) AFCI-protected receptacle
c) GFCI-protected receptacle
d) Tamper-resistant receptacle
Answer: c) GFCI-protected receptacle
What type of fan should be provided in the bathroom if there is no natural
ventilation through windows?
a) Ceiling fan
b) Built-in oscillating fan
c) Wall-mounted fan
d) Wall-switched or timer-operated, built-in ventilating fan capable of providing a
minimum of 8 to 10 air changes per hour per water closet (50 cfm/water closet)
Answer: d) Wall-switched or timer-operated, built-in ventilating fan capable of
providing a minimum of 8 to 10 air changes per hour per water closet (50
cfm/water closet)
Laundry Areas:
What type of lighting should be installed in laundry areas?
a) Floor lamps
b) Table lamps
c) Ceiling lights
Answer: c) Ceiling lights
How many receptacles are required in the laundry area?
a) One b) Two c) Three
Answer: b) Two
What type of receptacle is required for the clothes dryer?
a) 15 A receptacle
b) 20 A receptacle
c) GFCI-protected receptacle
Answer: b) 20 A receptacle
Is a ventilation fan required in the laundry area?
a) Yes
b) No
Answer: a) Yes
Halls/Corridors:
How should the entire area of halls/corridors be illuminated?
a) Table lamps
b) Floor lamps
c) Ceiling fixtures
Answer: c) Ceiling fixtures
What is the "vacuum-cleaner" rule?
a) A rule for choosing the right vacuum cleaner for the hallway
b) A rule for placing convenience receptacles in hallways
c) A rule for vacuuming the hallway
Answer: b) A rule for placing convenience receptacles in hallways
How many receptacles are required in hallways over 25 ft2 (2.3 m2) in floor
space?
a) None
b) One
c) Two
Answer: b) One
Utility Rooms:
What should be provided to illuminate the furnace/boiler area and work area in a
utility room?
a) Wall switch controlled convenience receptacles
b) GFCI protected receptacles
c) Ceiling fan
d) Wall switch controlled lighting outlets
Answer: d) Wall switch controlled lighting outlets
What should be provided in a utility room for each piece of mechanical equipment
requiring electrical connections?
a) Lighting outlets
b) GFCI protected receptacles
c) Special purpose outlets
d) Wall switches
Answer: c) Special purpose outlets
Shops/Garages:
Entrance Foyers:
Where should convenience receptacles be placed in entrance foyers?
a) On the ceiling
b) On the floor
c) On the walls
Answer: c) On the walls
Where should task lighting be provided in a garage?
a) Above workbenches
b) Above the garage door
c) On the ceiling
d) On the walls
Answer: a) Above workbenches
Stairways:
What type of lighting outlets should be installed in stairways?
a) Fixed wall or ceiling lighting outlets
b) Portable lamps
c) Outdoor lighting fixtures
Answer: a) Fixed wall or ceiling lighting outlets
Where should convenience outlets be GFCI protected in a garage?
a) Near workbenches
b) Near the garage door
c) Near the ceiling
d) Near the floor
Answer: a) Near workbenches
How should the stair system be illuminated?
a) From the top floor only
b) From the bottom floor only
c) From either floor
Answer: c) From either floor
Storage Rooms/Closets:
Is a smoke detector/alarm required in stairways?
a) Yes
b) No
Answer: a) Yes
How many lighting outlets should be provided for each large closet or storage
room?
a) None
b) One
c) Two
d) Three
Answer: b) One
What type of switches are preferred for storage room/closet lighting?
a) Wall switches
b) Automatic door switches
c) Pull switches
d) Dimmer switches
Answer: a) Wall switches
What kind of residence is used as an example in the system design?
a) Multi-story apartment building
b) Single-family residence
c) Commercial building
d) Townhouse
Answer: b) Single-family residence
What are the equipment and appliances included in the residence's electrical
system design?
a) Refrigerator, microwave, oven
b) Television, stereo system, computer
c) Water heater, clothes dryer, range
d) Swimming pool pump, hot tub heater, outdoor lighting
Answer: c) Water heater, clothes dryer, range, dishwasher, waste disposal, air
conditioner, garage door opener
What is the purpose of using loads from manufacturers' data in the example
system design?
a) To reduce the electrical load
b) To ensure that the equipment and appliances are compatible
c) To estimate the cost of the electrical system
d) To determine the energy efficiency of the equipment and appliances
Answer: b) To ensure that the equipment and appliances are compatible with the
electrical system design.
What is the purpose of coordinating with the architectural designer when locating
appliance and equipment outlets on a floor plan?
a) To determine the color scheme of the room
b) To ensure the outlets are located in convenient places
c) To choose the type of flooring for the room
d) To select the furniture for the room
Answer: b) To ensure the outlets are located in convenient places
What is the purpose of a luminaire schedule?
a) To determine the cost of the project
b) To list the types of appliances that require electrical connections
c) To provide a list of lighting fixtures and their load requirements
d) To specify the location of the panelboard
Answer: c) To provide a list of lighting fixtures and their load requirements
How many convenience receptacles are generally allowed on a circuit?
a) 2-4
b) 4-6
c) 6-8
d) 8-10
Answer: c) 6-8
Why is it important to anticipate future requirements when laying out circuits for
convenience receptacles?
a) To make the room look more attractive
b) To reduce the cost of the project
c) To allow for the addition of new appliances or equipment
d) To comply with code requirements
Answer: c) To allow for the addition of new appliances or equipment
When selecting a panelboard, what should be considered in terms of pole space?
a) All pole space should be taken up to maximize the capacity of the panelboard
b) Some pole space should be left available for future expansion
c) Pole space does not need to be considered in panelboard selection
d) Pole space only matters for 240 V or 120/240 V circuits
Answer: b) Some pole space should be left available for future expansion
How many poles does a 240 V circuit breaker typically take up in a panelboard?
a) 1 pole
b) 2 poles
c) 3 poles
d) 4 poles
Answer: b) 2 poles
What electrical code is universally used in the Philippines?
a. NEC
b. IEC
c. PEC
Answer: c. PEC
Describe the following branch circuits and where each is used:
a. Individual
b. General purpose
c. Appliance
Answer:
a. Individual - A circuit that supplies power to a single piece of equipment or
appliance. Used for large appliances such as refrigerators, air conditioners, and
water heaters.
b. General purpose - A circuit that supplies power to outlets and lighting fixtures in
a room. Used for general household appliances such as lamps, TVs, and
computers.
c. Appliance - A circuit that supplies power to a specific appliance or group of
appliances. Used for high-power appliances such as ovens, dryers, and stoves.
Describe a split wired circuit.
Answer: A split wired circuit is a type of circuit where two circuits share a neutral
wire. Each circuit has its own hot wire and shares a neutral wire, allowing for
twice the number of circuits to be installed using the same number of wires.
How many circuits are required to accommodate kitchen appliances in an
average size home?
a. 1
b. 2
c. 3
d. 4
Answer: d. 4
When selecting the panelboard size, what considerations for the future should be
taken into account?
a. The number of circuits required for current needs
b. The number of circuits that may be needed in the future
c. The amperage required for current needs
d. The amperage that may be required in the future
Answer: b. The number of circuits that may be needed in the future
How is the general lighting load for a building determined?
a. By adding up the wattage of all lighting fixtures in the building
b. By multiplying the square footage of the building by a standard wattage per
square foot
c. By consulting the building code
Answer: b. By multiplying the square footage of the building by a standard
wattage per square foot
How is the minimum service entrance determined?
a. By adding up the amperage of all the circuits in the building
b. By multiplying the square footage of the building by a standard amperage per
square foot
c. By consulting the building code
Answer: c. By consulting the building code
In selecting the service entrance size, what should be considered? On a 120/240
V, single-phase, three-wire system, identify the following:
a. Voltage between one grounded conductor and one ungrounded conductor
b. Voltage between two ungrounded conductors
Answer:
In selecting the service entrance size, the following should be considered:
The total connected load of the building
The maximum demand of the building
The type and number of loads served
On a 120/240 V, single-phase, three-wire system:
a. 120 V
b. 240 V
On a 208 Y/120 V, three-phase, four-wire system, identify the following:
a. Voltage between one grounded conductor and one ungrounded conductor
b. Voltage between two ungrounded conductors
Answer: a. 120 V
b. 208 V
On a 240 Y/120 V, three-phase, four-wire system, identify the following:
a. Voltage between one grounded conductor and one ungrounded conductor
b. Voltage between two ungrounded conductors
Answer: a. 120 V
b. 240 V
On a 480 Y/277 V, three-phase, four-wire system, identify the following:
a. Voltage between one grounded conductor and one ungrounded conductor:
277V
b. Voltage between two ungrounded conductors: 480 V
Identify five types of equipment that may require voltages higher than 120 V AC.
a. Electric water heaters
b. Electric furnaces
c. Large motors
d. Commercial air conditioning units
e. Industrial machinery
Identify three types of equipment that may require three-phase power.
a. Large motors
b. Commercial air conditioning units
c. Industrial machinery
What type of cable is permitted in single- and multifamily dwelling units but not in
buildings over three stories above grade or hazardous locations?
a) MC cable
b) AC cable
c) NM cable
d) SE cable
Answer: c) NM cable (Non-metallic sheathed cable)
What type of cable is permitted in direct-burial applications if protected by an
overcurrent protection device before leaving the panelboard?
a) Type UF cable
b) Type MC cable
c) Type AC cable
d) Type NM cable
Answer: a) Type UF cable (Underground Feeder cable)
TRUE OR FALSE AND NOTES
1.) A circuit breaker is a device used to control the flow of electricity through a
circuit. __________.
2.) Transformers are used to increase the voltage of electrical power for
transmission. __________.
3.) A capacitor is a device used to store and release electrical energy.
__________.
4.) A voltmeter is a device used to measure electric current. __________.
5.) A surge protector is a device used to regulate the voltage in an electrical
circuit. __________.
6.) The National Electric Code (NEC) is a standard that outlines the minimum
requirements for safe electrical
installation. __________.
7.) A ground fault circuit interrupter (GFCI) is a device used to protect against
electric shock. __________.
8.) The resistance of a conductor increases as its temperature increases.
__________.
9.) A three-phase electrical system is more efficient than a single-phase system.
__________.
10.) An electrical arc flash can cause severe injury or death. __________.
1.) Flase
5.) False
8.) True
2.) True
6.) True
9.) True
3.) True
7.) True
10.) True
4.) False
List four (4) types of electrical conduit.
1.1 ____________________, 1.2 ___________________, 1.3
___________________, 1.4 _________________.
1.1 PVC conduit, 1.2 EMT conduit, 1.3 RMC conduit, 1.4 IMC conduit.
PVC conduit: Polyvinyl chloride conduit
EMT conduit: Electrical metallic tubing conduit
RMC conduit: Rigid metal conduit
IMC conduit: Intermediate metal conduit
List four (4) types of electrical switches.
2.1 ____________________, 2.2 ___________________, 2.3
___________________, 2.4 _________________.
2.1 Single-pole switch, 2.2 Double-pole switch, 2.3 Three-way switch, 2.4
Four-way switch.
Name two (2) types of circuit breakers.
3.1 ____________________, 3.2 ___________________.
3.1 Magnetic circuit breaker 3.2 Thermal circuit breaker
List three (3) types of electrical test instruments.
4.1 ____________________, 4.2 ____________________, 4.3
___________________.
4.1 Multimeter, 4.2 Voltage tester, 4.3 Current clamp meter.
There are five commonly used electrical tools by electricians, give only two (2) of
them.
5.1 ____________________, 5.2 ____________________.
There are five commonly used electrical tools by electricians. What are those?
The five commonly used electrical tools by electricians are:
Pliers
Wire strippers
Screwdrivers
Electrical tape
Multimeter
Types of branch circuit
1. Individual Branch Circuit
2. General Purpose Branch Circuit
3. Appliance Branch Circuit
4. Multiwire Branch Circuit
5. Life Safety Branch Circuit
6. Critical Branch Circuit
7. Split Wiring Receptacles
8. Branch Circuit Rating and Loads
9. General Purpose Circuits
10. Individual Circuits
11. Appliance Circuits
Materials Considered as Good Electric Conductors
1. Silver
6. Zinc
2. Copper
7. Platinum
3. Aluminum
8. Iron
4. Nickel
9. lead
5. Brass
10. Tin
Various Kind of Insulators
1. Rubber
7. Latex
2. Porcelain
8. Asbestos
3. Varnish
9. Paper
4. Slate
10. Oil
5. Glass
11. Wax
6. Mica
12. Thermoplastic
PROBLEM SOLVING
PROBLEM SOLVING
PROBLEM SOLVING
No. 12 AWG copper conductor has a resistance of 0.162 Ω/100 ft. A No. 10
AWG (thicker than No. 12) conductor has a resistance of 0.102 Ω/100 ft.
Approximate the resistance in each conductor for total lengths of 10, 25,
and 50 ft.
a. No. 12 AWG: 0.0162 Ω, 0.0405 Ω, 0.081 Ω
b. No. 10 AWG: 0.0102 Ω, 0.0255 Ω, 0.051 Ω
c. No. 12 AWG: 0.00162 Ω, 0.00405 Ω, 0.0081 Ω
d. No. 10 AWG: 0.00102 Ω, 0.00255 Ω, 0.0051 Ω
Answer: b. No. 10 AWG: 0.0102 Ω, 0.0255 Ω, 0.051 Ω
A circuit consumes 4800 W of real power when the apparent power is 5600
VA.
a. Determine the power factor and phase angle ϕ.
An AC circuit serves inductive and resistive loads. Assume the voltage is
240 V and the current draw is 20 A. Compute the real power, assuming a
power factor of 0.9.
a. 4320 W
b. 4800 W
c. 3600 W
d. 4000 W
Answer: b. 4800 W
A No. 10 AWG (thicker than a No. 12) copper conductor has a resistance of
0.531 Ω/100 m. Approximate the resistance in lengths of 10, 25, and 50
meters.
a. 0.0531 Ω, 0.1328 Ω, 0.2656 Ω
b. 0.0531 Ω, 0.0531 Ω, 0.0531 Ω
c. 0.00531 Ω, 0.01328 Ω, 0.02656 Ω
d. 0.531 Ω, 1.3278 Ω, 2.656 Ω
Answer: a. 0.0531 Ω, 0.1328 Ω, 0.2656 Ω
An AC circuit is powering an electric heater (i.e., pure resistance, PF = 1.0).
Assume the voltage is 120 V and the current draw is 10 A. Compute the
apparent power and real power.
a. Apparent power = 1200 W, Real power = 1200 W
b. Apparent power = 1200 VA, Real power = 1200 W
c. Apparent power = 1000 W, Real power = 1200 W
d. Apparent power = 1000 VA, Real power = 1200 W
Answer: b. Apparent power = 1200 VA, Real power = 1200 W
An appliance is designed for use at 120 V and has a current draw of 15 A.
Determine the power consumed in watts.
a. 1,800 W
b. 1,440 W
c. 180 W
d. 12 W
Answer: a. 1,800 W
An AC circuit is powering an electric heater (i.e., pure resistance, PF = 1.0).
Assume the voltage is 240 V and the current draw is 15 A. Compute the
apparent power and real power.
a. Apparent power = 3600 W, Real power = 3600 W
b. Apparent power = 3600 VA, Real power = 3600 W
c. Apparent power = 2400 W, Real power = 3600 W
d. Apparent power = 2400 VA, Real power = 3600 W
Answer: b. Apparent power = 3600 VA, Real power = 3600 W
An appliance is designed for use at 36 V and has a current draw of 1.5 A.
Determine the power consumed in watts.
a. 54 W
b. 24 W
c. 54.5 W
d. 25.5 W
Answer: a. 54 W
A circuit consumes 3200 W of real power when the apparent power is 3800
VA.
a. Determine the power factor and phase angle ϕ.
a. 0.84, 33.55°
b. 0.84, 56.44°
c. 0.94, 33.55°
d. 0.94, 56.44°
Answer: a. 0.84, 33.55°
a. 0.86, 32.25°
b. 0.86, 57.75°
c. 0.94, 32.25°
d. 0.94, 57.75°
Answer: b. 0.86, 57.75°
An AC circuit is powering a motor (i.e., inductive load, PF < 1.0). Assume
the voltage is 240 V and the current draw is 15 A. Compute the real power,
assuming a power factor of 0.8.
a. 2400 W
b. 2880 W
c. 1920 W
d. 2160 W
Answer: b. 2880 W
An AC circuit is powering a motor (i.e., inductive load, PF < 1.0). Assume
the voltage is 240 V and the current draw is 30 A. Compute the real power,
assuming a power factor of 0.75.
a. 5400 W
b. 6480 W
c. 4320 W
d. 4860 W
Answer: b. 6480 W
A 25 kVA closet transformer located inside a building is used to step down
the voltage for the building. It is connected to a primary 7200 V AC power
source. The ratio of the number of primary windings to secondary windings
on the transformer is 30 to 1.
a. Approximate the secondary voltage provided.
b. Approximate the current available, in amps.
a. 240 V, b. 104 A
a. 120 V, b. 208 A
a. 240 V, b. 208 A
a. 120 V, b. 104 A
Answer: c. 240 V, b. 104 A
A 20 kVA closet transformer located inside a building is used to step down
the voltage
for the building. It is connected to a primary 4800 V AC power source. The
ratio of the
number of primary windings to the number of secondary windings on the
transformer is
20 to 1 and 40 to 1.
1. Approximate the secondary voltage provided.
a. 96 V
b. 240 V
c. 480 V
d. 960 V
Answer: b. 240 V
2. Approximate the current available, in amps
a. 4.17 A
b. 8.33 A
c. 41.7 A
d. 83.3 A
Answer: b. 8.33 A
PROBLEM SOLVING
PROBLEM SOLVING
PROBLEM SOLVING
A 100 W incandescent lamp remains lit for 24 hr a day during a 30-day
billing period.
A 23 W compact fluorescent lamp (equivalent to a 100 W incandescent
lamp) remains lit for 12 hr a day for a one-year period.
1. Determine the energy consumed over this period.
a. 72 kWh
b. 86.4 kWh
c. 100.8 kWh
d. 115.2 kWh
Answer: d. 115.2 kWh
1. The energy consumed over this period is approximately:
a) 46.80 kWh
b) 50.35 kWh
c) 53.90 kWh
d) 57.45 kWh
Answer: b) 50.35 kWh
What is the minimum frame size required for a single-phase, three-wire
panelboard that must feed 30 circuits?
a. 100A
b. 125A
c. 150A
d. 200A
Answer: b. 125A
2. Calculate the utility energy charges for this period at a rate of $0.12/kWh.
a. $10.24
b. $13.82
c. $15.36
d. $17.92
Answer: c. $15.36
2. The utility energy charges for this period at a rate of $0.12/kWh is
approximately:
a) $5.22
b) $6.04
c) $6.86
d) $7.68
Answer: b) $6.04
A 23 W compact fluorescent lamp (equivalent to a 100 W incandescent
lamp) remains lit for 24 hr a day during a 30-day billing period.
A circulating pump consumes 450 W for 24 hr a day.
1. The energy consumed over this period is approximately:
a) 16.56 kWh
b) 19.20 kWh
c) 21.84 kWh
d) 23.52 kWh
Answer: d) 23.52 kWh
2. The utility energy charges for this period at a rate of $0.12/kWh is
approximately:
a) $2.22
b) $2.82
c) $3.42
d) $4.02
Answer: b) $2.82
Ten 100 W incandescent lamps consume a total of 1,000 W or 1 kW of power
when lit.
1. The energy consumed over the one-year period is:
a) 8,760 kWh
b) 8,784 kWh
c) 9,000 kWh
d) 9,125 kWh
Answer: b) 8,784 kWh (calculation: 1 kW x 24 hours x 365 days = 8,760 kWh)
2. The utility energy charges for this period at a rate of $0.12/kWh is
approximately:
a) $1,054.08
b) $1,052.16
c) $1,045.76
d) $1,042.88
Answer: b) $1,052.16 (calculation: 8,784 kWh x $0.12/kWh = $1,052.16)
1. The energy consumed for a one-year period is approximately:
a) 3942 kWh
b) 3950 kWh
c) 3958 kWh
d) 3966 kWh
Answer: a) 3942 kWh
2. The utility energy charges for this period at a rate of $0.12/kWh is
approximately:
a) $473.04
b) $474.24
c) $475.44
d) $476.64
Answer: b) $474.24
3. The energy saved for a one-year period, if the pump is switched off 8 hr a
day, is approximately:
a) 1314 kWh
b) 1320 kWh
c) 1326 kWh
d) 1332 kWh
Answer: b) 1320 kWh
4. The energy cost savings for this period at a rate of $0.12/kWh, if the
pump is switched off 8 hr a day, is approximately:
a) $158.08
b) $158.40
c) $158.72
d) $159.04
Answer: b) $158.40
What is the minimum frame size required for a single-phase, three-wire
panelboard that must feed 36 circuits?
a. 125A
b. 150A
c. 175A
d. 200A
Answer: b. 150A
What is the minimum frame size required for a three-phase, four-wire
panelboard that must feed 42 circuits?
a. 150A
b. 175A
c. 200A
d. 225A
Answer: c. 200A
What frame sizes are available to meet the requirement of a three-phase,
four-wire panelboard that must feed 42 circuits?
a. 200A, 225A, 250A
b. 200A, 250A, 300A
c. 225A, 250A, 300A
d. 250A, 300A, 350A
Answer: b. 200A, 250A, 300A
From tables provided in this chapter, identify the NEMA designation for the
following wall-mounted, grounding-type devices used in a residence that
are rated at 15 A, 125 V, and serve as a connection method for a two-pole,
three-wire circuit:
1. Receptacle
2. Plug
Answers:
Receptacle: NEMA 5-15R
Plug: NEMA 5-15P
From tables provided in this chapter, identify the NEMA designation for the
following heavy-duty grounding-type devices that are rated at 20 A, 125 V,
and serve as a connection method for a two-pole, three wire circuit:
a. Receptacle
b. Plug
Answer:
a. NEMA 5-20R b. NEMA 5-20P
PROBLEM SOLVING
PROBLEM SOLVING
PROBLEM SOLVING
From tables provided in this chapter, identify the NEMA designation for the
following grounding-type devices requiring a 20 A, 250 V four-pole, four
wire, three-phase rating:
a. Receptacle
b. Plug
Answer: a. Receptacle: NEMA L16-20R
b. Plug: NEMA L16-20P
What is the ampacity of a No. 14 AWG copper conductor with THHN
insulation that will be used in a 120 V, two-wire circuit in an environment
with an average ambient air temperature of no greater than 86°F (30°C)?
a. 10 A
b. 15 A
c. 20 A
d. 25 A
Answer: b. 15 A
Determine the maximum one-way distance two conductors can carry a
current of 20 A on a 120 V, single phase circuit based on a maximum
voltage drop of 3%.Base your analysis on the following conductor sizes:
a. No. 14 AWG—copper
b. No. 14 AWG—aluminum
c. No. 12 AWG—copper
d. No. 12 AWG—aluminum
e. No. 8 AWG—copper
f. No. 8 AWG—aluminum
From tables provided in this chapter, identify the NEMA designation for the
following grounding-type devices requiring a 20 A, 250 V four-pole, four
wire, three-phase rating:
a. Receptacle
b. Plug
Answer: a. NEMA L16-20R
b. NEMA L16-20P
A 120V circuit has a resistance of 10 ohms. What is the current flowing
through the circuit?
a. 12A
b. 1.2A
c. 0.12A
d. 0.012A
Answer: b. 1.2A
A transformer has a primary voltage of 240V and a secondary voltage of
120V. If the primary current is 5A, what is the secondary current?
a. 2.5A
b. 5A
c. 10A
d. 20A
Answer: c. 10A
A motor has a power rating of 2 horsepower and operates at 90% efficiency.
What is the electrical power input to the motor if it operates at 240V?
a. 1,440W
b. 2,880W
c. 3,200W
d. 3,555W
Answer: b. 2,880W
A lighting system consists of 10 lamps rated at 50W each. If the system
operates at 120V, what is the total current draw of the system?
a. 5A
b. 42A
c. 50A
d. 600A
Answer: b. 42A
A circuit has a resistance of 20 ohms and a capacitance of 10 microfarads.
What is the time constant of the circuit?
a. 20 micro*s
b. 50 micro*s
c. 200 micro*s
d. 500 micro*s
Answer: c. 200 micro*s
What is the ampacity of a No. 12 AWG copper conductor with THHN
insulation that will be used in a 120 V, two-wire circuit in an environment
with an average ambient air temperature of no greater than 86°F (30°C)?
a. 20 A
b. 25 A
c. 30 A
d. 35 A
Answer: b. 25 A
What is the ampacity of a No. 12 AWG copper conductor with THHN
insulation that will be used in a 277 V, two-wire circuit in an environment
with an average ambient air temperature of no greater than 86°F (30°C)?
a. 10 A
b. 15 A
c. 20 A
d. 25 A
Answer: c. 20 A
What is the ampacity of a No. 4 AWG copper conductor with THHN
insulation that will be used in a 120 V, two-wire circuit in an environment
with an average ambient air temperature of no greater than 86°F (30°C)?
a. 50 A
b. 65 A
c. 85 A
d. 100 A
Answer: d. 100 A
What is the ampacity of a No. 1/0 AWG copper conductor with underground
feeder (UF) insulation that will be used in a 120 V, two-wire circuit in an
environment with an average ambient air temperature of no greater than
86°F (30°C)?
a. 150 A
b. 170 A
c. 195 A
d. 215 A
Answer: c. 195 A
What is the required wire size for copper and aluminum conductors that will
feed power to a well station with a load of 30 A, 150 ft away from the 120 V
power source at a maximum voltage drop of 3%?
a. No. 8 AWG copper or No. 6 AWG aluminum
b. No. 10 AWG copper or No. 8 AWG aluminum
c. No. 12 AWG copper or No. 10 AWG aluminum
d. No. 14 AWG copper or No. 12 AWG aluminum
Answer: a. No. 8 AWG copper or No. 6 AWG aluminum
a. No. 14 AWG—copper: 115 feet
b. No. 14 AWG—aluminum: 72 feet
c. No. 12 AWG—copper: 184 feet
d. No. 12 AWG—aluminum: 115 feet
e. No. 8 AWG—copper: 584 feet
f. No. 8 AWG—aluminum: 367 feet
Determine the maximum distance two conductors can carry a current of 20
A on a 277 V, single-phase circuit based on a maximum voltage drop of 3%.
Base your analysis on the
following conductor sizes:
a. No. 14 AWG—copper
b. No. 14 AWG—aluminum
c. No. 12 AWG—copper
d. No. 12 AWG—aluminum
e. No. 8 AWG—copper
a. No. 14 AWG—copper: 161.57 ft
b. No. 14 AWG—aluminum: 102.02 ft
c. No. 12 AWG—copper: 258.09 ft
d. No. 12 AWG—aluminum: 162.61 ft
e. No. 8 AWG—copper: 653.60 ft
What is the required wire size for copper and aluminum conductors that will
feed power to a well station with a load of 30 A, 150 ft away from the 120 V
power source at a maximum voltage drop of 3%?
a. No. 8 AWG copper or No. 6 AWG aluminum
b. No. 10 AWG copper or No. 8 AWG aluminum
c. No. 12 AWG copper or No. 10 AWG aluminum
d. No. 14 AWG copper or No. 12 AWG aluminum
Answer: a. No. 8 AWG copper or No. 6 AWG aluminum