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AC Motors, Alternators and Hydraulic Transmission


Quiz Questions

1.A two pole, 3,600 rpm alternator has a frequency of _______________.?
40 cps
60 cps
120 cps
360 cps
2. The control field of the exciter generator is in the collector circuit. Increasing the output of the exciter generator will increase the field strength of the AC generator, which will ____________ the generator output.
Decrease
Increase
3.A transistorized voltage regulator consists mainly of _________________.?
Transistors
Diodes
Resistors
All of the above
4.The overvoltage relay is closed when the generator output reaches ___________ and completes a circuit to the trip coil of the field control relay.
8 volts
16 volts
24 volts
32 volts
5.The speed of rotation of an AC motor depends upon the number of poles and the frequency of the electrical source of power, speed in rpm = ______________.?
(120 x Frequency)/Number of Poles
(120 x Number of Poles)/ Frequency
120 x (Frequency+(1/Number of Poles))
6. The following figure represents ______________________.?
PDH Course - AC Motors, Alternators and Hydraulic Transmission 1

Single phase motor with capacitor starting winding
Double phase motor with capacitor starting winding
Multi-phase motor with capacitor starting winding
7.

In Synchronous motor the torque developed does not depend on the induction of currents in the rotor.

True
False
8. The following figure represents _____________________________.?
PDH Course - AC Motors, Alternators and Hydraulic Transmission 2

Inductively compensated armature of AC series motor.
Transitivity compensated armature of AC series motor.
Conductively compensated armature of AC series motor.
9.The three phase alternator has three single phase windings spaced so that the voltage induced in each winding is ___________ out of phase with the voltages in the other two windings.
90°
120°
180°
270°
10.The synchronous motor is a simple self-starting motor.
True
False