1. There is one basic function of synchronous motor control in starting.
a. True
b. False
2. The principal difference between synchronous motor control and induction motor control is in the control of the field.
a. True
b. False
3. In the accompanying figure, when the stator is energized, the rotor circuit must be open at all times.
a. True
b. False
Name: Class: Date:
Unit 40 Push-Button Synchronizing
4. In the accompanying figure, the normally open contacts M in the F coil circuit prevent the DC field from being
energized before the motor is started.
a. True
b. False
5. In the accompanying figure, the ammeter and rheostat control the excitation current.
a. True
b. False
6. In the accompanying figure, the synchronous motor is started as an induction motor by ____ the start button.
a. pulling b. releasing
c. disconnecting d. pressing
7. In the accompanying figure, the rotating magnetic field of the stator acts like a ____.
a. transformer primary b. primary resistor starter
c. magnetic primary contactor d. time-delay relay
8. In the accompanying figure, the overlapping normally closed contacts ____ keep the loading resistor in the circuit.
a. F b. L
c. M d. T
Name: Class: Date:
Unit 40 Push-Button Synchronizing
9. The discharge resistor ____ the self-induced voltage from the collapsing DC magnetic field of the rotor windings.
a. dissipates b. recovers
c. complements d. increases
10. In the accompanying figure, the unity power factor of the motor can be found by adjusting the rheostat to obtain a
minimum reading on the AC ammeter in the ____ circuit.
a. branch b. stator
c. main d. rotor
Name: Class: Date:
Unit 40 Push-Button Synchronizing