electrical

Single Phase Induction Motor MCQ Questions and Answers Page - 4

1.

In repulsion motors, brush angle with respect to magnetic axis is kept

Answer/ Hint      

Answer : B

Explanation :

2.

The torque speed characteristic of a repulsion motor resembles
Which of the following dc motor characteristic?

Answer/ Hint      

Answer : C

Explanation :

3.

In a single-phase repulsion motor power factor is

Answer/ Hint      

Answer : C

Explanation :

4.

In a repulsion motor by shifting the brush position

Answer/ Hint      

Answer : C

Explanation :

5.

In a repulsion motor, torque developed will be zero when brush axis is at _____electrical degree to the field axis

Answer/ Hint      

Answer : D

Explanation :

6.

In a repulsion motor speed control is affected by varying the

Answer/ Hint      

Answer : D

Explanation :

7.

Direction of rotation of a repulsion motor is reversed by

Answer/ Hint      

Answer : B

Explanation :

8.

A repulsion start induction motor operates as an induction motor when

Answer/ Hint      

Answer : A

Explanation :

9.

The short-circuiting device in a repulsion start induction motor operates by

Answer/ Hint      

Answer : B

Explanation :

10.

Which of the following motors is not a synchronous motor?

Answer/ Hint      

Answer : B

Explanation :

11.

A single-phase reluctance motors

Answer/ Hint      

Answer : C

Explanation :

12.

Reluctance torque is the

Answer/ Hint      

Answer : B

Explanation :

13.

Reluctance motor

Answer/ Hint      

Answer : D

Explanation :

14.

The torque of a reluctance motor can be effectively increased by

Answer/ Hint      

Answer : C

Explanation :

15.

Hysteresis motor is a

Answer/ Hint      

Answer : C

Explanation :

16.

Hysteresis motor operates on the principle of

Answer/ Hint      

Answer : A

Explanation :

17.

The rotor of a hysteresis motor is made of magnetic material having area of hysteresis loop

Answer/ Hint      

Answer : A

Explanation :

18.

The rotor of a hysteresis motor is built up of

Answer/ Hint      

Answer : B

Explanation :

19.

A hysteresis motor

Answer/ Hint      

Answer : D

Explanation :

20.

In a single-phase hysteresis motor

Answer/ Hint      

Answer : A

Explanation :

21.

A hysteresis motor

Answer/ Hint      

Answer : D

Explanation :

22.

Hysteresis motors are used for Hi-Q record player because of them

Answer/ Hint      

Answer : B

Explanation :

23.

The main reason for using a hysteresis motor for high quality tape recorders and record players is that

Answer/ Hint      

Answer : B

Explanation :

24.

A ceiling fan uses

Answer/ Hint      

Answer : A

Explanation :

25.

Ceiling fan is

Answer/ Hint      

Answer : B

Explanation :

26.

The washing machines generally employ

Answer/ Hint      

Answer : B

Explanation :

27.

The electric motor generally used in household food mixers is

Answer/ Hint      

Answer : A

Explanation :

28.

For toys, the preferred motor is

Answer/ Hint      

Answer : A

Explanation :

29.

In case of reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor wil

Answer/ Hint      

Answer : D

Explanation :

30.

Which of the following motors would you select for vacuum cleaners?

Answer/ Hint      

Answer : B

Explanation :

31.

Which of the following applications would need the smallest size of motor?

Answer/ Hint      

Answer : B

Explanation :

32.

Which of the following application would need the smallest size of motor?

Answer/ Hint      

Answer : D

Explanation :

33.

In a shaded-pole motor, rotating magnetic field is produced by using

Answer/ Hint      

Answer : B

Explanation :

34.

A universal motor operates on

Answer/ Hint      

Answer : C

Explanation :

35.

In a split-phase motor the ratio of number of turns of starting winding to that for running winding is

Answer/ Hint      

Answer : A

Explanation :

36.

In a hysteresis motor, the rotor

Answer/ Hint      

Answer : D

Explanation :

37.

Shading coils, in case of a shaded pole motor are used to

Answer/ Hint      

Answer : D

Explanation :

38.

In a shaded pole motor, the direction of rotation is from

Answer/ Hint      

Answer : B

Explanation :

39.

Which motor has unsymmetrical rotor?

Answer/ Hint      

Answer : C

Explanation :

40.

If a single-phase motor runs hot the probable cause cannot be

Answer/ Hint      

Answer : A

Explanation :

41.

For ceiling fans generally, the single-phase motor used is

Answer/ Hint      

Answer : C

Explanation :

42.

The direction of rotation of universal motor can be reversed by

Answer/ Hint      

Answer : A

Explanation :

43.

Which of the following is most economical method of starting a single-phase induction motor?

Answer/ Hint      

Answer : D

Explanation :

44.

When a universal motor is operated on no-load, its speed is limited by

Answer/ Hint      

Answer : C

Explanation :

45.

What could be the size of a universal motor for use of vacuum cleaner?

Answer/ Hint      

Answer : C

Explanation :

46.

Which of the following application make use of universal motor?

Answer/ Hint      

Answer : A

Explanation :

47.

Reluctance motors are

Answer/ Hint      

Answer : A

Explanation :

48.

Which of the following motors is generally used for electric shavers?

Answer/ Hint      

Answer : A

Explanation :

49.

The rotor of which motor does not have winding on it?

Answer/ Hint      

Answer : D

Explanation :

50.

Which motor will make least noise?

Answer/ Hint      

Answer : A

Explanation :

51.

Which motor is relatively free from mechanical and magnetic vibration?

Answer/ Hint      

Answer : D

Explanation :

52.

A single-phase capacitor start motor will take starting current nearly

Answer/ Hint      

Answer : C

Explanation :

53.

For a system involving sound recording and reproduction which motor would you select?

Answer/ Hint      

Answer : D

Explanation :

54.

For the same rating which of the following motors has the highest starting torque?

Answer/ Hint      

Answer : B

Explanation :

55.

A capacitor selected for capacitor-run motor should be rated for

Answer/ Hint      

Answer : C

Explanation :

56.

If the ceiling fan, when switched on, runs at slow speed in the reverse direction, it can be concluded that

Answer/ Hint      

Answer : A

Explanation :

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