Synchronous Motors MCQs - Quiz 1

1. A synchronous motor can be started by:
A) Pony motor
B) D.C. compound motor
C) Providing damper winding
D) All of the above

The correct answer is D

2. A three-phase synchronous motor will have:
A) One slip-ring
B) Two slip-rings
C) Three slip-rings
D) No slip-rings

The correct answer is B

3. The power developed by a synchronous motor is maximum when the load angle is ___ degrees.
A) 135
B) 90
C) 45
D) 0

The correct answer is B

4. An ___ synchronous motor can be used as a synchronous capacitor.
A) Under-loaded
B) Under-excited
C) Over-loaded
D) Over-excited

The correct answer is D

5. Synchronous motors are mostly ___ type machines.
A) Induction
B) Cylindrical
C) Salient pole
D) None of the above

The correct answer is C

6. Synchronous motors always run at ___ speed.
A) Synchronous
B) More than synchronous
C) Less than synchronous
D) None of the above

The correct answer is A

7. An over-excited synchronous motor takes ___ current.
A) Lagging
B) Leading
C) Both A & B
D) None of the above

The correct answer is B

8. The working of a synchronous motor is similar to ___.
A) Transmission of mechancial power by shaft
B) Gear train arrangement
C) Turbine
D) Distribution transformer

The correct answer is A

9. The back e.m.f. of a synchronous motor depends on
A) Load
B) Load angle
C) Speed
D) None of the above

The correct answer is B

10. A synchronous motor can operate at ____ power factor.
A) Only unity
B) Only leading
C) Only lagging
D) Leading, lagging and unity

The correct answer is D