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MCQ ON SINGLE - PHASE INDUCTION MOTOR PAGE - 1

1.

The type of the motor that does not have a commulator is

Answer/ Hint      

Answer : B

Explanation :

2.

The rotor of a split phase motor receives its power from:

Answer/ Hint      

Answer : D

Explanation :

3.

The induction motors are designed for:

Answer/ Hint      

Answer : D

Explanation :

4.

The direction of rotation of a capacitor start motor can be reversed by

Answer/ Hint      

Answer : C

Explanation :

5.

What is the synchronous speed of 6 pole smotor running at 50Hz frequency supply

Answer/ Hint      

Answer : A

Explanation :

6.

The capacitance of a small (less than 1 H.P) single phase motor will be order of

Answer/ Hint      

Answer : D

Explanation :

7.

A repulsion start , indiuction hum motor runs as a squirrel –cage motor only when

Answer/ Hint      

Answer : B

Explanation :

8.

The direction of rotation of repulsion motor can be changed by changing

Answer/ Hint      

Answer : C

Explanation :

9.

Which one of the following motor will have the lowest starting torque

Answer/ Hint      

Answer : B

Explanation :

10.

The purpose of the shaded coils in a shaded pole motor is to

Answer/ Hint      

Answer : A

Explanation :

11.

Which one of the following motors can reverse its direction of rotaton by simply  reversing the supply connections?

Answer/ Hint      

Answer : D

Explanation :

12.

What is the function not a centrifugal switch?

Answer/ Hint      

Answer : B

Explanation :

13.

A.D.O.L starter is necessary for a single phase motor of more than one H.P for:

Answer/ Hint      

Answer : D

Explanation :

14.

Capacitor start and capacitor start capacitor run motors employ

Answer/ Hint      

Answer : C

Explanation :

15.

The rotational speed of a universal motor can be controlled by

Answer/ Hint      

Answer : D

Explanation :

16.

In a capacitor start induction run motor, a capacitor is used for

Answer/ Hint      

Answer : D

Explanation :

17.

Which one of the following single-phase motor perform with better power factor?

Answer/ Hint      

Answer : B

Explanation :

18.

Which type of motor is generally used in a portable electric blower?

Answer/ Hint      

Answer : C

Explanation :

19.

If a winding makes electrical contact with a the stator core, the winding is said to be

Answer/ Hint      

Answer : D

Explanation :

20.

A capacitor start induction run single phase motor has it capacitance replaced by an indctor of equivalent reactance value. If the motor is connected to te supply it will

Answer/ Hint      

Answer : B

Explanation :

21.

A capacitor start, single-phase motor will usually have a P.F. of:

Answer/ Hint      

Answer : B

Explanation :

22.

The most economical method of starting a single-phase motor is

Answer/ Hint      

Answer : D

Explanation :

23.

Which of the following motors will give the highest starting torque?

Answer/ Hint      

Answer : B

Explanation :

24.

A ceiling fan of 1400 mm sweep (56 inches) will have a motor of rating

Answer/ Hint      

Answer : B

Explanation :

25.

One of the reasons for noise in a single-phase capacitor motor is

Answer/ Hint      

Answer : D

Explanation :

26.

A single-phase universal motor fails to start because

Answer/ Hint      

Answer : A

Explanation :

27.

The direction of rotation of a universal motor is changed by

Answer/ Hint      

Answer : C

Explanation :

28.

A universal motor gives electric shock to the operator. The possible reason is:

Answer/ Hint      

Answer : A

Explanation :

29.

Which of the following single-phase motors will be cheapest?

Answer/ Hint      

Answer : A

Explanation :

30.

What is /are the shortcomings of repulsion motors?

Answer/ Hint      

Answer : D

Explanation :

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