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EE Actual & Pre-board Objectives
BS Electrical Engineering (Rizal Technological University)
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Apr. 2018
In the transformers
A. high tension winding is used near the core
C. low tension winding is used near the core
B. high tension winding is used away from the core
D. low tension winding is used away from the core
Apr. 2018
Which of the following parameters can be neglected for a short line?
A. resistance
B. inductance
C. reactance
D. capacitance
Apr. 2018
The curve representing Ohm’s law is
A. a parabola
B. linear
C. a sine function
D. a hyperbola
Apr. 2018
The overcurrent protective device is caused to operate by ______________________.
A. voltage surge
B. current flow
C. voltage drop
D. impedance
Apr. 2018
What is the maximum number of bends permitted in rigid conduits between outlets?
A. 4 quarter bends
B. 6 quarter bends
C. 2 quarter bends
D. 3 quarter bends
Apr. 2018
Which of the following insulators will be selected for high voltage application?
A. strain type
B. disc type
C. suspension type
D. pin type
Apr. 2018
If the torque angle δ continuously increases, system will become
A. stable
B. unstable
C. oscillatory stable
D. asymptotic stable
Sept. 2014/Apr. 2018
The condition in Ohm’s law is that
A. ratio V/I should be constant
C. the temperature should remain constant
B. current should be proportional to voltage
D. the temperature should vary
Sept.2015/Apr. 2018
Which of the following shall be included in the calculation of the reliability standard indices of the distributor
asset by the Philippine Distribution Code?
A. Outages that occur on the secondary lines of the distribution system
B. Planned outages where the customers have been notified at least three (3) days prior to the loss of power
C. Outages that occur on the primary lines of the distribution system
D. Outages that occur in the transmission line
Sept.2015/Apr. 2018
A type of electronics communication in which only one party transmits at a time.
A. Full duplex
B. Half duplex
C. Bicom
D. Simplex
Apr. 2018
Base load plants are designed to supply power at
A. low capital cost and low operating cost
C. low capital cost and high operating cost
B. high capital cost and low operating cost
D. high capital cost and high operating cost
Apr. 2018
Peak load plants are designed to supply power at
A. low capital cost and low operating cost
C. low capital cost and high operating cost
B. high capital cost and low operating cost
D. high capital cost and high operating cost
Apr. 2018
If the effect of earth is taken into account, then the capacitance of line to ground
A. decrease
B. increase
C. remain unchanged
D. become infinite
Apr. 2018
The effective resistance of conductor is increased by
A. skin effect
B. proximity effect
C. corona effect
D. both (a) and (b)
Apr. 2018
A two terminal pair of network of a transmission line can be represented by a
A. π-network
B. T-network
C. either (a) or (b)
D. three network
Apr. 2018
In television system, channels 2 and 13 are classified as
A. VHF
B. UHF
C. SHF
D. EHF
Apr. 2018
An ACSR conductor has (n-1) layers around its single center strand, the total number of strands will be
A. 3n2 + 3n + 1
B. 3n2 - 3n - 1
C. 3n2 + 3n - 1
D. 3n2 - 3n + 1
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Apr. 2018
Which of the following methods of generating electric power from the sea water is more advantageous?
A. water power
B. ocean power
C. Tidal power
D. none of these
Apr. 2015/Apr. 2018
When installing two grounding electrodes, the minimum distance between them is
A. 1,800 mm
B. 2,000 mm
C. 1,500 mm
D. 2,400 mm
Feb. 2014/Apr. 2018
The current flowing in L and C at parallel resonance are
A. zero
B. equal
C. infinite
D. different
Apr. 2018
What does PEMC in EPIRA stands for?
A. Philippine Energy Market Corporation
C. Philippine Electricity Market Corporation
B. Private Energy Marketing Company
D. Philippine Electrical Marketing Corporation
Apr. 2018
For two alternators operating in parallel, if the load shared by one of them is to be increased, its field excitation is
A. to be strengthened keeping input torque the same
B. to be weakened keeping input torque the same
C. to be kept constant but input torque should be increased
D. to be kept constant but input torque should be decreased
Apr. 2018
Open circuit test on transformers is conducted to determine
A. hysteresis loss
B. copper loss
C. core loss
D. eddy current loss
Apr. 2018
Which of the following power plant is a conventional source of energy
A. Solar energy
B. Geothermal energy C. Coal energy
D. Wind energy
Apr. 2018
In a synchronous motor, the magnitude of stator back emf depends on
A. load on the motor
C. both the speed and rotor flux
B. dc excitation only
D. none of these
26. Alternators installed in a hydro power plant, are of
A. low speed
B. high speed
C. medium speed
D. very high speed
27. In a loss-free RLC circuit, the transient current is
A. oscillating
B. square wave
C. sinusoidal
D. non-oscillating
28. At very low frequencies a series RC circuit behaves as almost purely
A. resistive
B. inductive
C. capacitive
D. none of these
29. One of the advantages of distributing the winding in alternators is to
A. reduce harmonics
C. improve voltage waveform
B. reduce the amount of copper
D. decrease the value of the voltage
30. The effect of corona is
A. increased reactance
B. increased inductance C. increased energy loss
D. all of these
31. The rms value of pure cosinefunction is
A. 0.5 of peak value
B. 0.707 of peak value C. same as peak value
D. zero
32. What is the equivalent IEEE device function number for directional power relay
A. 21
B. 32
C. 37
D. 87
33. Energy radiated continuously in the form of lighting waves is called?
A. luminous intensity
B. lumen
C. luminous flux
D. illumination
34. Efficiency is secondary consideration in case of
A. base load plants
B. peak load plants
C. both base load and peak load plants
D. none of these
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35. The condition of a liquid electrolyte is measured in terms of its
A. current value
B. specific gravity
C. acid content
36. If the field of a dc shunt motor is opened
A. it will continue to run at its rated speed
B. the speed of the motor will become very high
D. voltage output
C. the motor will stop
D. the speed of the motor will decrease
37. An ideal full-wave rectifier with non-inductive load has zero transformation losses. What is the efficiency?
A. 70%
B. 80%
C. 90%
D. 100%
38. The dummy coil in dc machines is used to
A. eliminate reactance voltage
B. eliminate armature reactance
C. bring about mechanical balance of armature
D. eliminate harmonics developed in the machine
39. The purpose of insulating oil when used on power circuit breaker are the following, EXCEPT;
A. Coolant
B. Interrupter
C. Quencher
D. Insulation
40. Inside a hollow spherical conductor
A. electric field is zero
B. electric field is constant
C. electric field changes with distance from the center of the sphere
D. electric field is unity
41. Residual magnetism is necessary in a
A. separately excited generator
B. self-excited generator
C. both of these
D. none of these
42. In case of delta connected circuit, when one resistor is open, power will be
A. unaltered
B. reduced to 1/9
C. reduced to 1/16
D. reduced by 1/3
43. Transient current in an RLC circuit is oscillatory when
A. R =0
B. R = √
C. R > √
D. R < √
44. With reference to armature windings, wave windings are often called _________ windings.
A. concentric
B. series
C. parallel
D. ring
45. This is the compact arrangement of switching devices;
A. Circuit protector
B. Switchboard
C. Switchgear
D. Panelboard
Apr. 2015/Sept. 2015/Sept 2016/Sept 2017
46. Which of the following is NOT INCLUDED in the Technical Performance Standards for Distribution and Supply set
by the Philippine Distribution Code?
A. Power Quality
B. Reliability
C. Collection Efficiency
D. System Efficiency
Feb. 2014/Sept 2016/Sept 2017
47. Which plant takes the least time in starting from cold condition to full load operation?
A. Steam turbine power plant
C. Gas turbine power plant
B. Hydro power plant
D. Nuclear power plant
Sept 2017
48. What is the equivalent IEEE device number for an under voltage relay?
A. 67
B. 52
C. 27
D. 51
Sept 2017
49. To adjust the power of the alternator, adjust the _______________.
A. power factor
B. governor
C. field current
D. frequency
Sept 2017/Apr. 2018
50. In a transmission line of negligible resistance, the surge impedance will be _______________.
A. square root of LC
B. square root of L/C C. square root of 1/LC
D. square root of C/L
Sept 2017
51. What is the purpose of reactor in short circuit?
A. To open the line in short circuit
C. To lessen the current in short circuit
B. To decrease the circuit resistance
D. To increase the current in short circuit
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Sept 2017
What is the maximum output power of a cellular transmitter?
A. 4.5 w
B. 1.5 w
C. 3 w
D. 6 w
Sept 2017
For constant transmission efficiency, voltage is increased n times, the size of the conductor would be
_________________________.
A. reduced to (1/n) times of the original
C. increased to n2 times of the original
B. reduced to (1/n2) times of the original
D. increased ton times of the original
Sept 2017
Copper loss of a transformer is determined by means of a/an _____________ test.
A. open-circuit
B. polarity
C. short-circuit
D. inductive-circuit
Sept 2017
The power transmission capacity of the transmission is ______________________.
A. inversely proportional to the voltage
C. proportional to the square of the voltage
B. directly proportional to the voltage
D. proportional to the cable of the voltage
Sept 2017
The under voltage relays are usually used for what protection of the electrical equipment?
A. feeder protection
B. motor protection
C. transformer protection
D. bus-bar protection
Sept 2017
Which of the following type of fault used only the equivalent positive sequence impedance of the circuit in the
short circuit calculation?
A. Line to Line
B. Line to ground
C. Double line to ground
D. Three-phase fault
Sept 2017
What device used to measure the temperature of a motor winding while the motor is in operation?
A. Seismic probe
C. Thermocouples
B. Resistance temperature detector
D. Proximity probe
Sept 2017
Which of the following is a primary disadvantage of FM over AM?
A. Lower efficiency
C. Higher cost and complexity
B. Noise susceptibility
D. Excessive use of spectrum space
Sept 2017
Which of the following that the voltage regulation is one of the important factors consider in the electrical
power design?
A. generator
B. transmission line
C. feeder
D. transformer
Sept 2017
Which of these is not a factor in the selection of fuse rating for protection of a branch circuit?
A. Branch full-load current
C. Branch fault-current
B. System impedance
D. System voltage
Sept 2014/Sept 2017
Which of the following principle will the operation of fiber-optic cable is based?
A. dispersion
B. refraction
C. reflection
D. absorption
Sept 2017
When the voltage remains the same, the current will ________________ as the impedance decrease
I. decrease
II. Increase
A. I only
B. Both
C. Either I or II
D. II only
Sept 2017
When electrons build up pressure at one point, it is called ___________________.
A. ganging
B. current flow
C. impedance
D. pressure filing
Sept 2017
Which of the following type of fault used only the equivalent positive and negative sequence impedance of the
circuit in the short-circuit calculation?
A. Double line to ground
B. Line to line
C. Three-phase
D. Line to ground
Sept 2017
Based on the Philippine Distribution Code, all users of the distribution system must maintain a certain power
factor at the connection point in order to maintain power quality in the system. What power factor should be
maintained at the connection point?
A. Not less than 65%
B. Not less than 70% C. Not less than 85%
D. Not less than 75%
Sept 2017
Which of the following is not considered in the selection of surge arrester?
A. Voltage rating
B. Current rating
C. Class of Arrester
D. Insulation level
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68. In full-wave rectification, if the input frequency is 60 Hz, then output has a frequency of ___________.
A. 30 HZ
B. 60 HZ
C. 120 HZ
D. 240 HZ
69. The specific gravity of a lead-acid cell is often used as a measure of its ______________.
A. rate of discharge
B. operating temperature
C. state of charge
D. life expectancy
70. The commonly used light sensor in a modern fax machine is the _______________.
A. photo tube
B. photo transistor
C. charge couple device
D. liquid crystal display
71. A standard candle emits a total luminous flux of _____________ lumens.
A. 12.57
B. 25.14
C. 78.96
D. 157.90
72. A space station with communication equipment that synchronizes with earth’s orbit.
A. space craft
B. space probe
C. satellite
D. scape CATV
73. Impurities in an electrolyte can cause an internal short circuit condition called
A. local action
B. depolarization
C. polarization
D. electrolysis
74. As load power factor of an alternator becomes more lagging, the value of generated voltage required to give
rated terminal voltage ____________________.
A. increase
B. decrease
C. remains unchanged
D. varies with rotor speed
75. In a commutator
A. copper is harder than mica
B. mica and copper are equally hard
C. mica is harder than copper
D. none of these
76. The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and
night is taken care of by which part of transformer?
A. Conservator
B. Breather
C. Bushings
D. Buchholz relay
77. Centrifugal switch disconnects the auxiliary winding of the motor at about _________ percent of synchronous
speed.
A. 30 to 40
B. 70 to 80
C. 80 to 90
D. 100
78. The material commonly used for insulation in high voltage cables is
A. lead
B. paper
C. rubber
D. glass
79. For a series RLC circuit at resonance, the current amplitude is _____________ for a fixed voltage amplitude and
the power factor is ______________.
A. minimum, zero
B. minimum, unity
C. maximum, zero
D. maximum, unity
80. If the length of a cable is doubled, its capacitance
A. becomes one-fourth
B. becomes one-half
C. becomes double
D. remains unchanged
81. Wye-delta starting is equivalent to autotransformer starting with ___________ tapping.
A. 73%
B. 67%
C. 58%
D. 33%
82. These days DC motors are widely used in
A. pumping sets
B. air compressors
C. electric tractions
D. machine shops
83. Breather mounted on transformer tank contains
A. water
B. oil
C. liquid
D. calcium
84. As load power factor of an alternator becomes more leading, the value of generated voltage required to give
rated terminal voltage ____________________.
A. increase
B. decrease
C. remains unchanged
D. varies with rotor speed
85. The process by which metallic parts are demagnetized is called ______________.
A. degaussing
B. demagnetizing
C. degrading
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86. Synchronous motors are
A. self-starting
B. not self-starting
C. essentially self-starting
D. none of these
Apr. 2017
87. It is difficult to magnetize steel because of its
A. high density
B. high retentivity
C. low permeability
D. high permeability
Apr. 2017
88. Present day capacitors which have high capacitance in small size use a diameter of
A. paper
B. rubber
C. ceramic
D. mylar
Apr. 2017
89. The current-carrying capacity of a copper wire having twice diameter of another copper wire is __________.
A. twice
B. four times
C. three times
D. half
Apr. 2017
90. What kind of device is a diode?
A. Bilateral
B. Linear
C. Unipolar
D. Nonlinear
Apr. 2017
91. If the line frequency is 60 Hz, the output frequency of a bridge rectifier is
A. 30 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Apr. 2017
92. In a shunt generator the voltage builds up till constrained by
A. speed limitation
B. armature heating
C. saturation of iron
D. insulation restriction
Apr. 2017
93. Slip rings are made of
A. steel
B. copper
C. bakelite
D. mica
Apr. 2017
94. For proper parallel operation, ac polyphase alternators must have the same ______________.
A. speed
B. KVA rating
C. Voltage rating
D. excitation
Apr. 2017
95. The series field of a short-shunt compound dc generator is excited by ___________ current.
A. shunt
B. armature
C. load
D. external
Apr. 2017
96. The reciprocal of permeability is
A. conductivity
B. susceptibility
C. reluctivity
D. permittivity
Apr. 2017
97. For which of the following sinusoids, the rms value and mean value is the same?
A. sine wave
B. triangular wave
C. square wave
D. half wave rectified
Apr. 2017
98. The maximum efficiency of a half-wave rectifier is ___________.
A. 40.6%
B. 80.6%
C. 50%
D. 20.3%
Apr. 2017
99. Ideal transformer assumptions do not include
A. no leakage flux
C. zero resistance of the winding
B. no saturation of core
D. zero reactance of the winding
100. If the load current and flux of a dc motor are held constant and voltage applied across its armature is increased
by 10 percent, its speed will _____________.
A. decrease by about 10%
C. increase by about 10%
B. remain uncharged
D. depend on armature resistance
101. If there is an open circuit In the rotor of a SCIM,
A. rotor will overheat
B. motor will be noisy
C. motor will not start
D. line fuses will blow
102. In a synchronous machine when the rotor speed becomes more than the synchronous speed during hunting, the
damping bars develop ________ torque.
A. synchronous motor
B. induction motor
C. induction generation
D. dc motor
103. At leading p.f., the armature flux in an alternator __________ the rotor flux.
A. distorts
B. does not affect
C. opposes
D. aids
104. This is the rating of power circuit breakers used to be the basis in replacing its contacts.
A. duty contact
B. duty time
C. duty rating
D. duty cycle
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105. The voltage applied across the resistor was reduced by 50%. The power consumed by the resistor will be
reduced by ______%.
A. 75
B. 50
C. 25
D. 100
106. The effect of the dielectric is to
A. increase the capacitance
C. increase the working voltage
B. decrease the capacitance
D. reduce the working voltage
Sept.2014/Apr. 2016
107. The color reserved for use in equipment grounding conductor is
A. Yellow
B. Green
C. White
D. Gray
Apr. 2016
108. Which of the following is not a full-duplex?
A. Radar
B. Telephone
C. Telemetry
D. Local Area Network
Apr. 2016
109. In a circuit breaker, the time duration from the instant of the fault to the extinction of arc is known as
A. operating time
B. total clearing time C. lag time
D. lead time
Apr. 2016
110. 34.5 KV to 69 KV is classified as
A. low voltage
B. medium voltage
C. high voltage
D. extra high voltage
Apr. 2016
111. For an RL circuit, the power factor cannot be less than _______ or greater than _________.
A. 0,1
B. 1,0
C. 0,-1
D. -1,0
Apr. 2016
112. _____________ is the overall energy program formulated and updated yearly by the DOE, submitted to
congress pursuant to R.A. 7638.
A. Philippine Energization Program
C. Philippine Electrification Program
B. Philippine Energy Plan
D. Philippine Electrification Plan
Apr. 2016
113. The lighting load for a dwelling expressed in terms of a unit load in volt-ampere per square meter must be at
least _________.
A. 24
B. 12
C. 16
D. 28
Apr. 2016
114. The capacitors of power factor correction are rated in terms of
A. KV
B. KW
C. KVA
D. KVAR
Apr. 2016
115. In a balanced three phase wye connected circuit, the line voltage are equal
A. to the line current
C. and so are the line currents
B. to the phase voltage
D. but the line currents are unequal
Apr. 2016
116. In a given circuit when power factor is unity the reactive power is
A. maximum
B. equal to I^2 R
C. zero
D. minimum
Apr. 2016
117. Joule found out that the heat produced in a current carrying conductor is proportional to
A. the square of the current
C. the square of resistance
B. the current
D. inversely proportional to time
Apr. 2016
118. In a wye connected system, line current is
A. 0.707 times the phase current
C. equal to the phase current
B. 1.735 times the phase current
D. 1.414 times the phase current
Apr. 2016
119. What is the device function number for overcurrent relay?
A. 27
B. 67
C. 50
D. 51
Apr. 2016
120. In a series RL circuit, the inductor current _____________ the resistor current.
A. lags
B. leads
C. is equal to
D. is greater than
Sept.2015/Apr. 2016/Sept. 2016
121. The specific resistance ρ is defined as
A. resistance of a conductor which has a length of 1m and cross-section of 1m2 at 20°C
B. resistance of any conductor at 25°C
C. resistance of any conductor at 20°C
D. resistance of a conductor which has a length of 1m and cross-section of 1cm2 at 20°C
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Apr. 2016
122. The master control center for a cellular telephone system is the
A. cell site
C. central office
B. mobile telephone switching office
D. branch office
Apr. 2016
123. The permeability of a material means
A. strength of permanent magnet
B. strength of an electromagnet
C. the magnetization left in the iron after exciting field has been removed
D. the conductivity of a material for magnetic lines of force
Apr. 2016
124. Is an instrument connected across the load
A. voltmeter
B. ammeter
C. ohmmeter
D. wattmeter
Apr. 2016
125. What will happen to the current of a transformer when the temperature of the transformer winding increases?
A. remains unchanged
B. increases
C. decreases
D. dramatically changes
Apr. 2016
126. The type of emf induced by neighboring coils.
A. self-induced
B. statically induced
C. dynamically induced
D. mutually induced
Apr. 2016
127. Transformers are used to change the value of the following EXCEPT:
A. alternating current
B. alternating voltage C. power
D. resistance
128. When a dc motor has no-load, what will happen to the back emf?
A. reduces
B. increase
C. becomes maximum
D. becomes zero
129. A 4-way switch controls a lamp from ________ different locations.
A. 1
B. 2
C. 3
D. 4
130. When a V-V system is converted into Δ-Δ system, increase in the capacity of the system is _________ percent.
A. 86.6
B. 73.2
C. 66.6
D. 50
131. Converts energy of water to mechanical energy
A. pump
B. turbine
C. generator
D. draft tube
132. The applied voltage in a transformer is increased by 50% and frequency is reduced by 50%. The maximum core
flux density will become ___________.
A. same
B. 1.5 times
C. 3 times
D. 5 times
133. A device that establishes an electrical connection to the earth.
A. Grounding conductor
C. Grounding electrode
B. Grounded conductor
D. Grounded electrode conductor
134. Which of the following is not a standard branch circuit ampere rating?
A. 15 A
B. 25 A
C. 30 A
D. 40 A
135. Once residual magnetism of a shunt generator is lost it may be restored by connecting its shunt field
A. to earth
C. to an external battery
B. in reverse
D. to an alternator
136. Power in balanced 3-phase system is measured by two-wattmeter method and it is found that the ratio of the
two-wattmeter readings is 2 is to 1. What is the power factor of the system?
A. 0.9
B. 0.82
C. 0.866
D. 0.707
137. A diversity factor of 2 gives a saving of ____% in generating equipment.
A. 33
B. 50
C. 67
D. 75
138. In a parallel RC circuit, as the capacitance decreases, the power factor ___________________.
A. increases
B. decreases
C. remains the same
D. becomes zero
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139. The current flowing in the armature conductors of a dc motor is
A. ac
B. dc
C. ac as well as dc
D. transients
Apr. 2015
140. One KWHR is equal to ______ BTU.
A. 360
B. 3,413
C. 3,600
D. 1,000
Apr. 2015
141. Which of the following is the basis for standards of electrical wiring installations in the Philippines?
A. Philippine Distribution Code
C. Philippine Electrical Code
B. Philippine Grid Code
D. Fire Code of the Philippines
Apr. 2015
142. In dwelling units with a hallway of 3 m or more in length, at least how many receptacle outlet/s shall be
installed?
A. 3
B. 2
C. 1
D. none
Apr. 2015
143. When the length of a wire is doubled and all other factor remained the same, what would the wire resistance
become?
A. remained the same
C. decreased
B. doubled
D. could not be determined
Apr. 2015
144. An act to ensure and accelerate the total electrification of the Philippines, also known as the EPIRA law of 2001.
A. RA 7920
B. RA 8189
C. RA 9136
D. RA 1081
145. Sparking occurs when a load is switched off because the circuit has high
A. capacitance
B. inductance
C. resistance
D. impedance
146. The primary reason for using carbon brushes over copper brushes in DC motors is
A. they have low loss
C. they produce less arcing
B. they stronger
D. all of these
147. Power developed by a dc motor is maximum when the ratio of back emf and applied voltage is
A. double
B. zero
C. unity
D. half
148. The starting winding of single phase motor is placed in
A. rotor
B. stator
C. armature
D. field
149. In a synchronous motor, the rotor copper losses are met by
A. motor input
B. armature input
C. supply lines
D. dc source
150. A substance that contains atoms with several bands of electrons but with only one valence electrode is
A. Insulator
B. Conductor
C. Semiconductor
D. Resistor
151. If the capacitance in a series RLC ac circuit increases by a factor of 4, what happens to the resonant frequency?
A. It doubles
C. It decreases by 50%
B. It stays the same
D. It increases by 50%
152. When a conductor is stationary and the magnetic field is moving or changing, the emf induced is called:
A. Self-induced emf
C. Mutually induced emf
B. Statically induced emf
D. Dynamically induced emf
153. A coulomb
A. represents a current of 1 ampere
B. flow through a 100 watt light bulb
C. is equivalent to 1 ampere per seconds
D. is an extremely large number of charge carriers
154. Fault level means
A. voltage at the point of fault
B. fault current
C. fault power factor
D. fault MVA
155. Which plant can never have 100% load factor?
A. Hydro
B. Peak
C. Nuclear
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D. Base load plant
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156. A potentially lethal electric current is on the order of
A. 0.01 mA
B. 0.1 mA
C. 1 mA
D. 0.1 A
157. The unit of elastance is
A. farad
C. siemen
D. henry
B. daraf
158. All magnetic fields originates from
A. moving electric charges
B. iron atoms
C. magnetic domain
D. permanent magnets
159. An ion
A. is electrically neutral
B. has positive electric charge
C. has negative electric charge
D. can have either a positive or negative charge
160. An induction motor is analogous to
A. two winding transformer with open circuit secondary
B. two winding transformer with short circuit secondary
C. 3 winding transformer
D. autotransformer
Sept. 2014
161. A material best suited for manufacturing of fuse wire is
A. Aluminum
B. Silver
C. Lead
D. Copper
Sept. 2014
162. In the Fleming’s left hand rule, thumb always represents
A. voltage
C. current
B. direction of force on conductor
D. magnetic field
Sept. 2014
163. The net reactance in a series RLC circuit is
A. XL
B. XC
C. XC + XL
D. XL - XC
Sept. 2014
164. The ampere-hour capacity of battery depends on
A. the thickness of the plates
C. the strength of the electrolytes
B. the area of the plates
D. the distance between the plates
Sept. 2014
165. For a three phase unbalanced load
A. the power factor of each phase will be proportional to the load
B. the power factor of each phase will be the same
C. the power factor of at least one of the phases must be leading
D. the power factor of each phase may be different
Sept. 2014
166. What is the maximum allowable voltage drop for lighting circuit?
A. 3%
B. 5%
C. 2%
D. 10%
Sept. 2014
167. What is the maximum allowable voltage drop for feeder?
A. 1%
B. 2%
C. 3%
D. 5%
Sept. 2014
168. Overhead lines are protected from lighting by the use of
I. overhead ground conductors
II. Surge arrester
A. I only
B. II only
C. either I or II
D. both I and II
169. The synchroscope is an instrument used to indicate the
A. speed of a motor
B. phase relationship between the current and the voltage
C. phase relationship between two voltages
D. phase relationship between the true power and the reactive power
170. The armature current drawn by any dc motor is proportional to
A. the voltage applied to the motor
C. the torque required
B. the flux required in the motor
D. the speed of the motor
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171. If the input of the prime mover of an alternators is kept constant but excitation is increased then
A. KVA will be leading
C. KVA will be lagging
B. KW will be charged
D. the p.f. of the load remains constant
172. In electroplating, the positive electrode is called the
A. cathode
B. anode
C. terminal
D. iontrap
173. Barrier potential of silicon diode is:
A. 0.1 v
B. 0.3 v
C. 0.4 v
D. 0.7 v
174. Which of the following is an active element of a circuit
A. ideal current source
C. Resistance
B. Inductance
D. Capacitance
175. Which wave form will have the minimum rms value if they have the same peak value of voltage?
A. Square wave
C. Sine wave
B. Triangular wave
D. Full wave rectified sine wave
176. The minimum armature current of a synchronous motor corresponds to operation at
A. 0.8 p.f. lagging
B. unity p.f.
C. 0 p.f. leading
D. 0 p.f. lagging
177. Lap winding is best suited for _______ voltage, ________ current dc generators.
A. high, low
B. low, high
C. high, high
D. low, low
178. Wave winding is best suited for _______ voltage, ________ current dc generators.
A. high, low
B. low, high
C. high, high
D. low, low
179. What is the relative permittivity of vacuum?
A. unity
B. 8.854 x 10 -12
C. zero
C. 8.854
180. On tripling the number of turns of a coil the inductance
A. becomes 9 times as large
C. 3 times
B. 1/3
D. will remain same
181. An external resistance is added in series with the field of a dc shunt motor. When the motor runs, the effect of
resistance is
A. to reduce the speed of the motor
B. to increase the speed of the motor
C. to reduce the armature current drawn by the motor
D. to reduce the losses
182. Which of the following is not the method of arc dispersion?
A. oil immersion contacts
C. magnetic blow out of arc
B. use of rectifiers
D. deionization of arc path
183. During load shedding
A. system voltage is reduced
B. system power factor is changed
C. some loads are switched off
D. system frequency is reduced
184. The capacitor in a series RC circuit at steady state is:
A. open circuit
B. short circuit
C. transient circuit
D. coupled circuit
185. The ratio of lumen reaching the work plane divided by the total lumens generated by the lights is:
A. Room ratio
C. Coefficient of utilization
B. Illumination factor
D. Maintenance factor
186. When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected, then
A. the motor stops
C. it runs at the same speed
B. it runs at lower speed
D. it runs at very high speed
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187. Sensitivity of a voltmeter is expressed as
A. Volts/Ohm
B. Ohms/Volt
C. Ohms-Volt
D.1/Ohms-Volt
188. The dc armature winding in which the coil sides are placed a pole pitch apart is called __________ winding
A. Multiplex
B. Full-pitch
C. Fractional-pitch
D. Pole-pitch
Feb. 2014
189. In A series RLC circuit, the impedance at resonance is
A. maximum
B. minimum
C. infinity
D. different
Feb. 2014
190. The current in RLC circuit, i.e. at resonance is
A. maximum
B. minimum
C. infinity
D. zero
Feb. 2014
191. What is the maximum distance between two receptacles in a single family dwelling unit?
A. 1.5 m
B. 1.6 m
C. 1.8 m
D. 2.0 m
Feb. 2014
192. The value of mutual inductance in terms of self-inductance of the two coils L1 and L2 is proportional to
D. √
A. L1L2
B. L1/L2
C. √
Feb. 2014
193. Which of the following relays is used in transformers?
A. Buchholz relay
B. Mho relay
C. Merz-Price relay
D. Translay relay
Feb. 2014
194. The heat required to raise 1 gram of water at 1 °C is
A. calorie
B. BTU
C. joule
D. KWHR
Feb. 2014
195. Heating value of coal largely depends on
A. ash content
C. volatile matter
B. moisture content
D. size of coal particle
Feb. 2014
196. For open circuited condition of Thevenin’s Theorem, all sources of emf in the network are replaced by
A. their internal impedance
C. as a total a big source of emf
B. their internal resistance
D. their internal reactance
Sept. 2009/Sept. 2015/Sept. 2016
197. Heating effect of current has an undesirable side effect in
A. electric oven
B. immersion heater
C. electric iron
D. vacuum cleaner
Sept.2015/Sept. 2016
198. When the sole purpose of an alternating current Is to produce heat, the selection of conductor is based on
____________ value of the current.
A. average
B. instantaneous
C. root mean square
D. peak
Sept. 2015/Sept. 2016
199. What is the primary advantage of FM to AM?
A. FM has a greater bandwidth than AM
C. more complex
B. noise immunity
D. greater capture effect
Sept.2015/Sept. 2016
200. The phase angle for a series RC circuit may be computed as the angle between the ____________ and
____________ phasors.
A. resistance, impedance
C. resistance, capacitance
B. resistance, reactance
D. impedance, reactance
Sept.2015/Sept. 2016
201. What is the formula for the synchronous speed of a motor?
A.
B.
C.
D.
Sept. 2016
202. Which is not a characteristic of an ideal transformer?
A. finite permeability
B. infinite permeability C. no losses
D. no leakage flux
Sept.2015/Sept. 2016
203. It is defined as the total number of sustained Customer power interruptions within a given period divided by
the total number of Customers served within the same period.
A. System Average Interruption Frequency Index
C. Customer Average Interruption Frequency Index
B. System Average Interruption Duration Index
D. Customer Average Interruption Duration Index
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Sept. 2016
204. The impedance triangle is similar to the ___________ triangle with the resistance phasor in place of the
________.
A. current, resistor current
C. voltage, impedance
B. current, resistor voltage
D. voltage, resistor voltage
Sept. 2016
205. What is the IEEE device function number 50?
A. AC time overcurrent relay
C. AC circuit breaker
B. Instantaneous overcurrent relay
D. Differential protective relay
Sept. 2016
206. In long transmission line, at no-load, the receiving end voltage as compared to the sending end voltage is
I. higher
II. Lower
III. Remains the same
A. I only
B. II only
C. Either I or II
D. III only
Sept. 2016
207. What determines the direction of force in a conductor?
A. Lenz law
B. Faraday’s law
C. Left hand rule
D. Right hand rule
Sept. 2016
208. The study of illumination involves
A. design of lighting system
B. study of lighting and wiring system
C. calculation of wiring sizes for various lighting fixtures
D. study of photometry and its application
Sept. 2016
209. When a power plant is not able to meet the demand of consumers It will resort to
A. load shedding
B. efficient plant operation
C. power factor improved at the generators
D. penalizing high load consumers by increasing the charges of electricity
Sept. 2016
210. A distributor is designed from the point of view of
A. voltage drop
C. voltage drop and current carrying capacity
B. current carrying capacity
D. load capacity
Sept. 2016
211. Conservator of a transformer consists of
A. an air-light metal drum fixed at the top of the tank
B. drum placed at the bottom of the tank
C. overload protection
D. none of these
Sept. 2014/Sept. 2016
212. Cellular phones operate in the frequency range of
A. EHF
B. VHF
C. UHF
D. SHF
Sept. 2016
213. Varmeter when paired with other devices measures __________ factor?
A. diversity
B. power
C. load
D. demand
Sept. 2016
214. The type of ac distribution system commonly used to supply both light and power is the
A. open delta system
C. three phase wye system with neutral wire
B. three phase delta system
D. three phase wye system without neutral wire
Sept. 2014/Sept. 2016
215. If an electrical network having one or more than one voltage source, is transformed into equivalent electrical
network with a single voltage source (which is short circuit current of previous circuit) with parallel internal
resistance of the network with all current source replaced by their internal resistance. The above illustration is
called
A. Thevenin’s theorem
C. Reciprocity theorem
B. Norton’s theorem
D. Superposition theorem
Sept. 2016
216. Which of the most reliable power plant?
A. Steam
B. Hydro
C. Wind
D.Tidal
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Sept. 2016
217. What governs the minimum safety requirement in the Philippines for distribution and grid?
A. Philippine Electrical Safety Code
C. Philippine Grid Code
B. Philippine Electrical Code
D. Philippine Distribution Code
Sept. 2016
218. In a diode modulator, what supplies the negative halfwave?
A. Inductor
B. Capacitor
C. Resistor
D. Tuned Circuit
Sept. 2016
219. Which is not a source of power?
A. Thermocouple
B. Fuel cell
C. Photovoltaic cell
D. Solar cell
Sept. 2016
220. When the frequency of a synchronous motor increases, what happens to its speed?
A. decreases
B. increases
C. remains the same
D. none of these
Sept. 2016
221. What instrument measures the insulation of a powerline?
A. growler
B. ohmmeter
C. galvanometer
D. megger
222. In an ac circuit, a low value of KVAR compared with KW indicates.
A. maximum load current
B. low efficiency
C. high power factor
D. unity power factor
223. Branch circuit larger than ________ amperes shall only supply non-lighting outlet load.
A. 15
B. 20
C. 30
D. 50
224. The velocity of electromagnetic waves in free space is given by
A. √
⁄
225. Induced charge on insulator
A. resides on surface
B. moves inside
226. Human body is
A. insulator
B. √
C. 1/√
D. √ ⁄
C. changes into electric current
D. moves outward
B. low resistive
C. conductor
227. The presence of earth in case of overhead lines
A. increases the capacitance
B. decreases the capacitance
C. increases the inductance
D. decreases the inductance
228. Transformer breaths in when
A. load on it increases
B. load on it decreases
C. load remains constant
D. none of these
229. The shaft of synchronous motor is made of
A. mild steel
B. chrome steel
C. alnico
D. electrolyte
D. stainless steel
230. Bundled conductors are used in transmission lines, the effective capacitance and inductance will respectively
A. decrease an increase
C. remain same and increase
B. increase and decrease
D. decrease and remain same
231. In a three phase system, when the loads are perfectly balanced, the neutral current is
A. zero
C. two-thirds of maximum
B. one-third of maximum
D. at maximum
232. A double squirrel-cage induction motor has
A. two rotors moving in opposite direction
C. two parallel windings in rotor
B. two parallel windings in stator
D. two series windings in stator
Sept. 2015
233. A balanced delta connected load has impedances Z1=Z2=Z3. What is the per phase equivalent impedance in
wye?
A. Z1/3
B. 3Z1
C. 2Z1/3
D. Z1
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Sept. 2015
234. Nuclear reactors generally employ
A. fusion
C. both fusion and fission
B. fission
D. none of these
Sept. 2015
235. In a parallel circuit the potential difference across the resistance
A. varies
C. is sometimes constant
B. is different from the applied voltage
D. is always constant
Sept. 2015
236. What is the IEEE device function number 21?
A. overvoltage relay
C. distance relay
B. undervoltage relay
D. differential relay
Sept. 2015
237. Which is not included in a basic communication circuit?
A. antenna
C. communication channel
B. transmitter
D. receiver
Sept. 2015
238. Two wattmeter can be used to measure 3-phase power of a
A. balanced and unbalanced load
C. balanced load only
B. unbalanced load only
D. unity power factor only
Sept. 2015
239. The resistance phasor for a series RC circuit points to the right. The capacitance reactance phasor points
______ while the diagonal of the rectangle having these two phasors as sides represents the __________.
A. up, impedance
C. left, current
B. down, reactance
D. impedance, reactance
Sept. 2015
240. What is the type of relay that is intended to respond to the difference between incoming and outgoing
electrical quantities?
A. Directional
B. Differential
C. Subtractive
D. Distance
Sept. 2015
241. Transformer A is in parallel with transformer B. If the equivalent impedance of the transformer B is greater
than A, then
A. KVA share of transformer A is greater than that of B
B. KVA share of transformer A is less than that of B
C. KVA share of transformer B is greater than that of A
D. the two transformers will have equal share
Sept. 2015
242. What effect on current flow does receiving the direction of movement of a conductor in the magnetic field of a
generator have?
A. is neutralizes the current flow
C. it reverses the direction of current flow
B. has no effect on current
D. none of these
Sept. 2015
243. Receptacle outlet in a dwelling unit must be installed no more than __________ mm above the floor
A. 1,700
B. 1,800
C. 3,700
D. 1,600
Sept. 2015
244. The depletion region of a junction diode forms the _________ of the capacitor.
A. Plates
B. Dielectric
C. Package
D. none of these
Sept. 2015
245. As specified by the Energy Regulatory Commission (ERC), a customer is said to be a large customer if its
demand is at least ________ MW.
A. 1
B. 2
C. 3
D. 5
Sept. 2015
246. Which of the following can be used as lightning protection for distribution line?
A. lightning arrester
C. overhead ground conductor
B. surge arrester
D. surge arrester and overhead ground conductor
Sept. 2015
247. Silica gel prevents air moisture from entering the outdoor transformer tank. It is placed in
A. Conservator
B. Breather
C. Core
D. Windings
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248. In an alternator, the armature reaction influences the magnitude of
A. no-load loss
C. terminal voltage/phase
B. speed of the machine
D. waveform of the voltage generated
249. A 230 V DC series motor Is connected to 230 V AC. It will ____________.
A. run faster
C. run with less efficiency
B. run slowly
D. not run at all
250. This is the device function number for DC power circuit breaker
A. 52
B. 72
C. 82
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D. 92