electrical

Single Phase Induction Motor MCQ Questions and Answers Page - 5

1.

Which of the following motors is suitable for timing and control purposes?

Answer/ Hint      

Answer : A

Explanation :

2.

In which single-phase motor, the motor has no teeth or winding?

Answer/ Hint      

Answer : C

Explanation :

3.

If a single-phase motor fails to start but gives humming noise this may be due to

Answer/ Hint      

Answer : C

Explanation :

4.

If a single-phase motor fails to start it may be due to

Answer/ Hint      

Answer : D

Explanation :

5.

When a ceiling fan using a capacitor run motor is switched on, it hums but does not run. When it is driven by some external means it runs in the direction in which it was made to run. The probable cause is

Answer/ Hint      

Answer : A

Explanation :

6.

An electric motor gets overheated This may be due to

Answer/ Hint      

Answer : D

Explanation :

7.

If the centrifugal switch fails to open when the motor attains 70 to 80 per cent of synchronous speed, it would result in

Answer/ Hint      

Answer : C

Explanation :

8.

The running winding of a single-phase motor is found cathode on testing. The most probable location of ground fault is at the

Answer/ Hint      

Answer : C

Explanation :

9.

Burning out of windings is due to

Answer/ Hint      

Answer : B

Explanation :

10.

An open in the centrifugal switch circuit gives an induction of

Answer/ Hint      

Answer : A

Explanation :

11.

Starting or auxiliary winding of a single-phase motor used in a refrigerator is disconnected from the circuit by

Answer/ Hint      

Answer : B

Explanation :

12.

Which of the following types of motors are not the induction motors?

Answer/ Hint      

Answer : A

Explanation :

13.

Which of the following types of motors are not the commutator motors?

Answer/ Hint      

Answer : B

Explanation :

14.

Which of the following types of ac motors are synchronous type?

Answer/ Hint      

Answer : D

Explanation :

15.

Which of the following motors does not use a centrifugal switch?

Answer/ Hint      

Answer : A

Explanation :

16.

Which single phase induction motor has the lowest speed?

Answer/ Hint      

Answer : A

Explanation :

17.

For speeds higher than say 3000 rpm the machine used is

Answer/ Hint      

Answer : C

Explanation :

18.

AC servomotor is basically a

Answer/ Hint      

Answer : C

Explanation :

19.

Two stator windings of ac servomotors are oriented ____electrical degrees apart.

Answer/ Hint      

Answer : A

Explanation :

20.

A linear servomotor must have

Answer/ Hint      

Answer : A

Explanation :

21.

A stepper motor is a ____device

Answer/ Hint      

Answer : C

Explanation :

22.

The input to a stepper motor is in the form of

Answer/ Hint      

Answer : B

Explanation :

23.

The rotor of a stepper motor has

Answer/ Hint      

Answer : D

Explanation :

24.

For given stepper motor, the following torque has the high numerical value

Answer/ Hint      

Answer : C

Explanation :

25.

The following motor definitely has a permanent magnet rotor:

Answer/ Hint      

Answer : C

Explanation :

26.

The motor which can be produce uniform torque from standstill to synchronous speeds is

Answer/ Hint      

Answer : D

Explanation :

27.

Stepper motors are mostly used for

Answer/ Hint      

Answer : B

Explanation :

28.

Stepper motors are widely used because of

Answer/ Hint      

Answer : D

Explanation :

29.

Which one of the following types of motors is not suitable for a computer printer drive?

Answer/ Hint      

Answer : D

Explanation :

30.

The output of a stepper motor is in the form of

Answer/ Hint      

Answer : C

Explanation :

31.

Which motor is usually employed in motor generator sets

Answer/ Hint      

Answer : C

Explanation :

32.

By pushing and pulling the rotor shaft of a motor, we can check its

Answer/ Hint      

Answer : A

Explanation :

33.

Electrical faults in a motor occur most commonly in its

Answer/ Hint      

Answer : C

Explanation :

34.

Which of the following statements regarding repulsion induction motor is incorrect?

Answer/ Hint      

Answer : B

Explanation :

35.

Which of the following statements about universal motor is incorrect?

Answer/ Hint      

Answer : A

Explanation :

36.

The speed with which magnetic field of an induction motor rotates is called

Answer/ Hint      

Answer : C

Explanation :

37.

A repulsion-start induction-run single phase motor runs as induction motor only when

Answer/ Hint      

Answer : D

Explanation :

38.

In a repulsion motor, brushes are connected

Answer/ Hint      

Answer : D

Explanation :

39.

A motor gets overheated due to

Answer/ Hint      

Answer : D

Explanation :

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Single Phase Induction Motor MCQ Questions and Answers Page - 5