An electrical generator is a device that converts electrical energy into mechanical energy.
Select one:
True
False
The correct answer is 'False'.
The basic theory of electrical generation was discovered by ? in 1831.
a. Andre Ampere
b. Charles Coulomb
c. Georg Simon
d. Michael Faraday
The correct answer is: Michael Faraday
DC current flows in one direction in a conductor, while AC current flows in both directions.
Select one:
True
False
The correct answer is 'True'.
Inducing a voltage into a conductor by passing it through a magnetic field is called ? .
a. electromagnetic induction
b. electrostatic induction
c. relative motion
d. reluctance
The correct answer is: electromagnetic induction
There must be ? between the conductor and the magnetic field in order to have a voltage induced.
a. electromagnetic induction
b. relative motion
c. reluctance
d. resistance
The correct answer is: relative motion
In order to induce one volt into a single conductor, ? lines of flux must be cut in one second.
a. 10,000
b. 1,000,000
c. 10,000,000
d. 100,000,000
The correct answer is: 100,000,000
The ? makes up all non-rotating electrical parts of a generator or motor.
a. brushes
b. commutator
c. slip rings
d. stator
The correct answer is: stator
At the start, or 0° position, of the armature rotation cycle, induced EMF is ? volts.
a. 0
b. 0.5
c. 1
d. 2
The correct answer is: 0
The magnitude of voltage produced by electromagnetic induction can be increased by
increasing the number of loops in the wire that cuts the field.
Select one:
True
False
The correct answer is 'True'.
Voltage can also be increased by making the magnetic field stronger or by increasing the
? of the conductor cutting flux lines in the magnetic field..
a. material
b. resistance
c. size
d. speed
The correct answer is: speed
Which of the following is a source of mechanical energy used to turn the rotor of a generator?
a. Fossil fuels
b. Manpower
c. Water
d. Wind
e. All of the above
The correct answer is: All of the above
Which of the sources of mechanical energy must be converted into another form in order to turn the rotor of a generator?
a. Fossil fuels
b. Manpower
c. Water
d. Wind
The correct answer is: Fossil fuels
Most modern commercial electric power is produced by electromagnetic induction.
Select one:
True
False
The correct answer is 'True'.
Electrical generators produce DC voltage.
Select one:
True
False
The correct answer is 'False'.
How is the voltage removed from an AC generator and applied to an external circuit?
a. Commutators are used.
b. Inverters are used.
c. Slip rings and brushes are used.
d. Stators are used.
The correct answer is: Slip rings and brushes are used.
In DC machines, a(n) ? is used instead of slip rings.
a. coil
b. commutator
c. inverter
d. stator
The correct answer is: commutator
A commutator converts the DC generated in the armature winding to an AC output from the generator.
Select one:
True
False
The correct answer is 'False'.
What rule relates motion, direction of magnetic field, and direction of current flow for electromagnetic induction?
a. The left hand rule for conductors
b. The left hand rule for generators
c. The right hand rule for conductors
d. The right hand rule for generators
The correct answer is: The left hand rule for generators
Applying the left hand rule for generators, the middle finger indicates the direction of current induced into the ? .
a. armature
b. brushes
c. commutator
d. stator
The correct answer is: armature
Electromagnetic induction can also be accomplished by moving a(n) magnetic field
across a(n) conductor.
Select one:
True
False
The correct answer is 'True'.
Because the commutator is a split ring with each half insulated from the other, and the brushes are fixed, each brush is always connected to the loop going in the same direction.
Select one:
True
False
The correct answer is 'True'.
How much voltage is induced into the loop at the one-half turn or 180-degree position of the rotation?
a. 0 V
b. 1 V
c. 2 V
d. 5 V
The correct answer is: 0 V
At what point(s) in the rotation of the armature is the maximum positive voltage induced?
a. One-eighth turn
b. One-quarter turn
c. One-half turn
d. Three-quarter turn
The correct answer is: One-quarter turn
At what degree of rotation in a generator cycle is the maximum negative voltage produced?
a. One-eighth turn
b. One-quarter turn
c. One-half turn
d. Three-quarter turn
The correct answer is: Three-quarter turn
The magnitude of the voltage being produced by electromagnetic induction is determined by how many lines of magnetic flux are being cut by the conductor per second.
Select one:
True
False
The correct answer is 'True'.
In DC motors and generators, the armature is the stator and the field is the rotor.
Select one:
True
False
The correct answer is 'False'.
The armature is always the rotor on DC machines that have a commutator.
Select one:
True
False
The correct answer is 'True'.
A commutator will have ? pair(s) of segments for each coil in the armature.
a. 1
b. 2
c. 3
d. 4
The correct answer is: 1