electrical

Three Phase Induction Motor MCQ Objective Questions and Answers Page - 2

1.

In an induction motor, the air gap flux density is usually kept low so as to

Answer/ Hint      

Answer : B

Explanation :

2.

A wound rotor induction motor can be distinguished from squirrel cage induction motor by

Answer/ Hint      

Answer : A

Explanation :

3.

For induction motors normally

Answer/ Hint      

Answer : A

Explanation :

4.

A 3-phase , 4-squirrel cage indcutioni motor has 36 stator and 28 rotor slots. The number of phases in the rotor is

Answer/ Hint      

Answer : A

Explanation :

5.

The rotor slots are slightly skewed in  squirrel cage indcuiton mtor to

Answer/ Hint      

Answer : B

Explanation :

6.

Skewing of the rotor in a three phase squirrel cage induction motor redues

Answer/ Hint      

Answer : A

Explanation :

7.

The principle of operation of a 3-phase induction motor is almost smiliar to that of

Answer/ Hint      

Answer : C

Explanation :

8.

The rotor of a 3-phase induction motor rotates in the same direction as that of stator rotating field. This canbe explained by

Answer/ Hint      

Answer : B

Explanation :

9.

The relative speed between stator and rotor fluxes is equal to

Answer/ Hint      

Answer : C

Explanation :

10.

Stator flux induces emf in the rotor bar

Answer/ Hint      

Answer : C

Explanation :

11.

The 3-phse induction motor with  rotor circuit open will

Answer/ Hint      

Answer : C

Explanation :

12.

If any two leads from slip rings are interchanged in a 3-phase induction motor the motor will

Answer/ Hint      

Answer : A

Explanation :

13.

Two of the supply terminals to a 3-phase induction motor get interchanged during reconnection after normal maintenance , When switched on to supply the motor will

Answer/ Hint      

Answer : B

Explanation :

14.

The direction of rotation of a 3-phase induction motor canbe reversed by

Answer/ Hint      

Answer : A

Explanation :

15.

 The rotor of an induction motor rotates in the direction of the rotation of stator field in order to

Answer/ Hint      

Answer : A

Explanation :

16.

The rotor of an induction motor never runs at synchronous speed because then the relative speed between the rotating flux and rotor will be

Answer/ Hint      

Answer : D

Explanation :

17.

The voltage actually used for setting  of the useful flux I the air gap of 3-phase induction motor is

Answer/ Hint      

Answer : A

Explanation :

18.

Synchronous speed is defined as the speed at which the

Answer/ Hint      

Answer : A

Explanation :

19.

The maximum possible speed of a 3-phase squirrel cage induction motor running at a slip of 4% is

Answer/ Hint      

Answer : A

Explanation :

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