1. An automatic synchronous motor starter can be used with a synchronous motor to provide automatic control of the
startup sequence.
a. True
b. False
2. There are three basic methods of starting synchronous motors automatically.
a. True
b. False
3. The squirrel cage winding will overheat if a synchronous motor starts, accelerates, and reaches synchronous speed
within a time interval determined to be normal for the motor.
a. True
b. False
4. A synchronous motor is started by accelerating the motor to as high a speed as possible from the squirrel cage
winding and then applying the DC field excitation.
a. True
b. False
5. The development of the brushless DC exciter is an improvement in synchronous motor excitation.
a. True
b. False
Name: Class: Date:
Unit 42 Synchronous Automatic Motor Starter
6. The field contactor opens ____ to the source of excitation.
a. the top line b. both lines
c. the second line d. either of the two lines
7. A solenoid-operated field contactor is similar in appearance to the standard ____ contactor.
a. magnetic b. AC
c. DC d. polarized
8. The coil of the field contactor is operated from the same direct-current source that provides excitation for the ____.
a. AC field winding b. low inductive circuit
c. dynamic magnetic field d. synchronous motor field
9. If the synchronous motor operates at subsynchronous speed, the squirrel cage winding may ____ and be damaged.
a. subcool b. restart
c. overheat d. reset
10. In the brushless DC exciter, the commutator of a conventional direct-connected exciter is replaced with a three-
phase, bridge-type, ____.
a. solid-state rectifier b. controlled rectifier
c. direct transformer d. small rectifier
Name: Class: Date:
Unit 42 Synchronous Automatic Motor Starter