electrical

Single Phase Induction Motor MCQ Questions and Answers Page - 3

1.

The type of single-phase induction motor having the highest power factor at full load is

Answer/ Hint      

Answer : D

Explanation :

2.

In various types of split phase 1- phase induction motors, the starting torques produced are in the following descending order

Answer/ Hint      

Answer : A

Explanation :

3.

In hand tool applications, which one of the following single-phase motor is used?

Answer/ Hint      

Answer : D

Explanation :

4.

A dc shunt motor does not operate on ac due to

Answer/ Hint      

Answer : C

Explanation :

5.

A dc series motor is accidently connected to single phase ac supply. The torque produced will be

Answer/ Hint      

Answer : D

Explanation :

6.

A 230 V dc series motor is connected to a 230 V ac supply

Answer/ Hint      

Answer : B

Explanation :

7.

If a dc series motor is operated on ac supply, it

Answer/ Hint      

Answer : B

Explanation :

8.

AC series motors are built with as few fields turns as possible to reduce

Answer/ Hint      

Answer : C

Explanation :

9.

AC series motors in comparison to dc series motors do not have

Answer/ Hint      

Answer : D

Explanation :

10.

AC series motors in comparison to dc series motors do not have

Answer/ Hint      

Answer : B

Explanation :

11.

In an ac series motor, power factor is improved by

Answer/ Hint      

Answer : B

Explanation :

12.

In an ac series motor, commutation is improved by

Answer/ Hint      

Answer : C

Explanation :

13.

In ac series motors armature coils are usually connected to commutator

Answer/ Hint      

Answer : A

Explanation :

14.

A universal motor is one which has

Answer/ Hint      

Answer : C

Explanation :

15.

A universal motor run at

Answer/ Hint      

Answer : A

Explanation :

16.

Speed of the universal motor is

Answer/ Hint      

Answer : C

Explanation :

17.

Direction of rotating of a universal motor can be reversed by

Answer/ Hint      

Answer : A

Explanation :

18.

The speed of a universal motor is usually reduced by using

Answer/ Hint      

Answer : B

Explanation :

19.

In a universal motor the most common cause(s) of brush sparking is/are

Answer/ Hint      

Answer : D

Explanation :

20.

under no load operating condition, the speed of a universal motor is limited by

Answer/ Hint      

Answer : A

Explanation :

21.

The armature reaction in a large sized universal motor is neutralized by

Answer/ Hint      

Answer : B

Explanation :

22.

In case of a high-speed universal motor____needs maximum attention

Answer/ Hint      

Answer : C

Explanation :

23.

In universal motors, normally the ratio of width of brushes to the width of commutator segments is

Answer/ Hint      

Answer : A

Explanation :

24.

Repulsion motor

Answer/ Hint      

Answer : D

Explanation :

25.

A repulsion motor is equipped with

Answer/ Hint      

Answer : C

Explanation :

26.

In a repulsion motor

Answer/ Hint      

Answer : D

Explanation :

27.

The commutation of repulsion motor is at its best

Answer/ Hint      

Answer : B

Explanation :

28.

In a repulsion motor, commutator provides a means of connecting the

Answer/ Hint      

Answer : B

Explanation :

29.

In a repulsion motor the brushes are connected

Answer/ Hint      

Answer : B

Explanation :

30.

Starting winding of a single-phase motor of a refrigerator Is disconnected from the circuit by mean of a

Answer/ Hint      

Answer : A

Explanation :

31.

If a single-phase induction motor runs slower than normal, the most likely defect is

Answer/ Hint      

Answer : A

Explanation :

32.

Which of the following motors is used in tape-recorders?

Answer/ Hint      

Answer : A

Explanation :

33.

Which of the following statements regarding two value capacitor motor is incorrect?

Answer/ Hint      

Answer : B

Explanation :

34.

Two—value capacitor motor finds increased application as compressor motor in small home air-conditioners because

Answer/ Hint      

Answer : C

Explanation :

35.

If the centrifugal switch of a two-value capacitor motor using two capacitor fails to open then

Answer/ Hint      

Answer : D

Explanation :

36.

In a universal motor, the most common cause of brush sparking is

Answer/ Hint      

Answer : D

Explanation :

37.

If starting winding of a single-phase induction motor is left in the circuit, it will

Answer/ Hint      

Answer : C

Explanation :

38.

Most of the fractional horsepower motors have either

Answer/ Hint      

Answer : D

Explanation :

39.

Which of the following statements regarding reluctance-start motor is incorrect?

Answer/ Hint      

Answer : A

Explanation :

40.

To reverse the direction of rotation of a capacitor-start motor while it is running we should

Answer/ Hint      

Answer : A

Explanation :

41.

When a ceiling fan employing a capacitor run motor is switched on, it hums but does not burn. When it is driven by external means, it runs in whatever direction it is made to run. The trouble is due to

Answer/ Hint      

Answer : D

Explanation :

42.

Which of the following motor has two separate windings on the motor?

Answer/ Hint      

Answer : B

Explanation :

43.

A shaded pole motor does not posses

Answer/ Hint      

Answer : D

Explanation :

44.

In a A.C series motor armature coils are usually connected to commutator

Answer/ Hint      

Answer : A

Explanation :

45.

A universal motor is one of which

Answer/ Hint      

Answer : A

Explanation :

46.

A repulsion motor is required with

Answer/ Hint      

Answer : B

Explanation :

47.

The capacitor used in single-phase capacitor motor have no

Answer/ Hint      

Answer : C

Explanation :

48.

if a D.C series motor is operated on A.C supply, it will

Answer/ Hint      

Answer : D

Explanation :

49.

After the starting winding of a single-phase induction motor is disconnected from supply, it continues to run only on

Answer/ Hint      

Answer : A

Explanation :

50.

A.C series motors as compared to D.C series motor has

Answer/ Hint      

Answer : D

Explanation :

51.

Locked rotor current of a shaded pole motor is

Answer/ Hint      

Answer : C

Explanation :

52.

Speed control of a universal motor is achieved by

Answer/ Hint      

Answer : D

Explanation :

53.

Hysteresis motor is particularly useful for high-quality record players and tape-recorders because

Answer/ Hint      

Answer : D

Explanation :

54.

Which of the following statements regarding single-phase induction motor is correct?

Answer/ Hint      

Answer : D

Explanation :

55.

The starting winding of a single-phase motor is placed in

Answer/ Hint      

Answer : D

Explanation :

56.

The speed of a universal motor is usually reduced by using

Answer/ Hint      

Answer : A

Explanation :

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