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MCQ ON SINGLE - PHASE INDUCTION MOTOR PAGE - 2

1.

For the same rating the size of the single-phase induction motor is about …. That of the corresponding three phase induction motor

Answer/ Hint      

Answer : C

Explanation :

2.

For speeds higher than 3000 R.P.M, the machine used is

Answer/ Hint      

Answer : C

Explanation :

3.

Universal motor runs at

Answer/ Hint      

Answer : A

Explanation :

4.

In a repulsion, motor energy is transferred from stator field winding to the rotor

Answer/ Hint      

Answer : A

Explanation :

5.

A domestic mixer uses the following motor

Answer/ Hint      

Answer : C

Explanation :

6.

The electric motor generally used in houses hold food mixers is

Answer/ Hint      

Answer : A

Explanation :

7.

For which of the following applications is the universal motor most suitable?

Answer/ Hint      

Answer : C

Explanation :

8.

Synchronous speed of an inductor can be increased by

Answer/ Hint      

Answer : D

Explanation :

9.

Rotor resistance speed control is used in

Answer/ Hint      

Answer : C

Explanation :

10.

During plugging of an induction motor

Answer/ Hint      

Answer : A

Explanation :

11.

Capacitor in a single-phase induction motor is used for

Answer/ Hint      

Answer : D

Explanation :

12.

Capacitor start and capacitor start and capacitor run motors are used in

Answer/ Hint      

Answer : D

Explanation :

13.

A shaded pole single phase induction motor can be used for

Answer/ Hint      

Answer : D

Explanation :

14.

If a single-phase induction motor runs at a speed lower than the rated one, the most likely defect is

Answer/ Hint      

Answer : B

Explanation :

15.

The suitable motor for domestic fans is

Answer/ Hint      

Answer : C

Explanation :

16.

The washing machines generally employ

Answer/ Hint      

Answer : B

Explanation :

17.

For toys, the preferred motor is

Answer/ Hint      

Answer : A

Explanation :

18.

Reversal of spend in single-phase motor is obtained by

Answer/ Hint      

Answer : C

Explanation :

19.

Single-phase induction motors are noisier than 3 phase induction motors because of

Answer/ Hint      

Answer : C

Explanation :

20.

The direction of rotation of a capacitor start single phase induction motor can be reversed by interchanging terminals of

Answer/ Hint      

Answer : D

Explanation :

21.

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

Answer/ Hint      

Answer : D

Explanation :

22.

An electric motor gets overheated. This may be due to …

Answer/ Hint      

Answer : D

Explanation :

23.

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

Answer/ Hint      

Answer : C

Explanation :

24.

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

Answer/ Hint      

Answer : D

Explanation :

25.

If a single-phase induction motor runs at a speed lower than the rated one, the most likely defect is …

Answer/ Hint      

Answer : B

Explanation :

26.

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 hit was made to run. The possibl

Answer/ Hint      

Answer : A

Explanation :

27.

Single-phase motor whose direction of rotation cannot be changed by changing the connection is a

Answer/ Hint      

Answer : C

Explanation :

28.

The rating of fuse for the protection of single-phase motors should be equal to three times the…

Answer/ Hint      

Answer : D

Explanation :

29.

As per BIS 1709-1984 recommendation, what is the ohmic value of insulation test conducted between the shorted capacitor terminal and the metal can, when measured by a 500 V megger?

Answer/ Hint      

Answer : C

Explanation :

30.

The type of capacitor used in capacitor start motor is …

Answer/ Hint      

Answer : A

Explanation :

31.

The position of the shaded ring with respect to main pole of the shaded pole motor determines…

Answer/ Hint      

Answer : B

Explanation :

32.

In shaded pole single-phase motor, the revolving field is produced by

Answer/ Hint      

Answer : C

Explanation :

33.

In repulsion start induction run motors, while the motor is running the brushes will

Answer/ Hint      

Answer : B

Explanation :

34.

Current drawn from the supply type by a permanent capacitor motor will be

Answer/ Hint      

Answer : A

Explanation :

35.

The direction of rotation of a permanent capacitor motor can be reversed by interchanging the

Answer/ Hint      

Answer : B

Explanation :

36.

In an universal motor, the armature reaction can be reduced by

Answer/ Hint      

Answer : B

Explanation :

37.

One of the operating characteristics of universal motor is…

Answer/ Hint      

Answer : D

Explanation :

38.

Single phase capacitor start induction run motor is used in wet grinders. How will you connect the capacitor in wet grinder motor?

Answer/ Hint      

Answer : A

Explanation :

39.

The stator winding of any type of an induction motor burns immediately, when its s rotor is not rotating due to the absence of back emf during an AC supply Which motor stator winding will not burn,

Answer/ Hint      

Answer : D

Explanation :

40.

The function of capacitor in a capacitor start induction run motor is for

Answer/ Hint      

Answer : D

Explanation :

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MCQ ON SINGLE - PHASE INDUCTION MOTOR PAGE - 2