electrical

DC Generator MCQ Objective Questions and Answers Page - 3

1.

Pole shoe of a dc machine is laminated for the purpose of

Answer/ Hint      

Answer : B

Explanation :

2.

The  function (s) of pole shoes in a dc machine is / are to

Answer/ Hint      

Answer : D

Explanation :

3.

Poles of dc machine are aften laminated to

Answer/ Hint      

Answer : A

Explanation :

4.

The ventilating ducts in most of the dc machines are

Answer/ Hint      

Answer : C

Explanation :

5.

Armature of a dc machine is made of

Answer/ Hint      

Answer : D

Explanation :

6.

The armature of a dc machine is laminated

Answer/ Hint      

Answer : B

Explanation :

7.

What are slot wedges in a dc machine made of

Answer/ Hint      

Answer : C

Explanation :

8.

The armature of a dc machine is made of silicon steel lamination to

Answer/ Hint      

Answer : D

Explanation :

9.

In a dc machine, the armature is always on the rotor unlike an ac machine where it could be either on the stator or rotor, because

Answer/ Hint      

Answer : A

Explanation :

10.

The teeth in the armature of a dc machine are sometimes skewed This is done to reduce

Answer/ Hint      

Answer : D

Explanation :

11.

The self induced emf I the coil undergoing commutation is called the

Answer/ Hint      

Answer : A

Explanation :

12.

The sparking at the brushes in a dc machine is due to

Answer/ Hint      

Answer : B

Explanation :

13.

The reactance  voltage is

Answer/ Hint      

Answer : C

Explanation :

14.

If the armature currents increased to double its previous value, and the time of commutation  is halved, how will the reactance voltage vary ?

Answer/ Hint      

Answer : D

Explanation :

15.

Spark less commutation can be achieved by employing

Answer/ Hint      

Answer : D

Explanation :

16.

To have sparkles commutation the armature reaction effect in a dc machine is neutralized by

Answer/ Hint      

Answer : A

Explanation :

17.

The interpoles in dc machines have tapering shape in  order to

Answer/ Hint      

Answer : B

Explanation :

18.

The compensating windings are placed in the slots in the pole faces to neutralize the

Answer/ Hint      

Answer : D

Explanation :

19.

In large sized dc machines the compensating windings are provided to

Answer/ Hint      

Answer : B

Explanation :

20.

Compensating winding in a dc machine is placed on

Answer/ Hint      

Answer : C

Explanation :

21.

Compensating windings are employed in dc motors which are likely to operate

Answer/ Hint      

Answer : D

Explanation :

22.

The compensating winding in a dc machine

Answer/ Hint      

Answer : C

Explanation :

23.

In dc machines the interpoles are provided

Answer/ Hint      

Answer : D

Explanation :

24.

The commutating flux produced by interpole must be proportional to

Answer/ Hint      

Answer : A

Explanation :

25.

The interpole air gap is …………that under the filed poles , in dc machines

Answer/ Hint      

Answer : B

Explanation :

26.

A dc machine is provided with both interpole and compensating windings. These two windings with respect to armature circuit will be in

Answer/ Hint      

Answer : A

Explanation :

27.

The mmf necessary for establishment of flux in the magnetic circuit of a dc generator can be obtained by means of filed coils excited by

Answer/ Hint      

Answer : C

Explanation :

28.

In a separately excited dc generator the field is connected

Answer/ Hint      

Answer : C

Explanation :

29.

Series field winding of a dc machine consists of

Answer/ Hint      

Answer : A

Explanation :

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