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MCQ ON DC MOTOR PAGE - 1

1.

A force will act  on a conductor placed in a magnetic field when

Answer/ Hint      

Answer : A

Explanation :

2.

The back e.m.f opposes

Answer/ Hint      

Answer : B

Explanation :

3.

Back e.m.f is developed in the armature due to

Answer/ Hint      

Answer : C

Explanation :

4.

The magnitude of Eb in a.d.c motor in the start is equal to

Answer/ Hint      

Answer : A

Explanation :

5.

If in a shunt motor the applied emf is kept constant then on increasing the load, the shunt filed strength will become_____its normal value

Answer/ Hint      

Answer : C

Explanation :

6.

In a series motor, the magnetic field flux stands

Answer/ Hint      

Answer : A

Explanation :

7.

The speed of a series motor is very high at no load because in  such state

Answer/ Hint      

Answer : C

Explanation :

8.

A series motor is wound with

Answer/ Hint      

Answer : C

Explanation :

9.

In a shunt motor, a starter is used for

Answer/ Hint      

Answer : D

Explanation :

10.

Voltage equation for a d.c motor is

Answer/ Hint      

Answer : A

Explanation :

11.

The rotating part of ad.c motor is known as

Answer/ Hint      

Answer : D

Explanation :

12.

In a d.c machine, a dummy coil is used to

Answer/ Hint      

Answer : C

Explanation :

13.

The rotational speed of a d.c shunt motor can be increases above its full speed by

Answer/ Hint      

Answer : D

Explanation :

14.

On increasing the load of a d.c shunt motor, its speed will

Answer/ Hint      

Answer : D

Explanation :

15.

The armature current (Ia) drawn by a d.c motor is proportional to

Answer/ Hint      

Answer : B

Explanation :

16.

The power written on the name plate of a a d.c. motor is always

Answer/ Hint      

Answer : C

Explanation :

17.

The efficiency of an electrical machine  will be high if

Answer/ Hint      

Answer : A

Explanation :

18.

The direction of rotation of a d.c motor can be reversed by

Answer/ Hint      

Answer : D

Explanation :

19.

Reversing the armature connections or the filed connections

Answer/ Hint      

Answer : D

Explanation :

20.

if the back e.m.f is absent in a d.c. motor  then the

Answer/ Hint      

Answer : C

Explanation :

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