electrical

DC Generator MCQ Objective Questions and Answers Page - 5

1.

Welding generator will have

Answer/ Hint      

Answer : A

Explanation :

2.

If in a 6 pole lap wound dc machine, the air gap under each pole is not the same , this is likely to result in

Answer/ Hint      

Answer : C

Explanation :

3.

The number of parallel paths for a 4-pole duplex lap winding will be

Answer/ Hint      

Answer : D

Explanation :

4.

Minimum number of coils of r400 V , 6-pole lap connected dc machine for a maximum voltage of 15V between adjacent commutator  segments should

Answer/ Hint      

Answer : B

Explanation :

5.

Widith of a carbon brush should be equal to

Answer/ Hint      

Answer : C

Explanation :

6.

A duplex lap winding with equalizers and even number of pairs of poles is

Answer/ Hint      

Answer : A

Explanation :

7.

Wave winding is composed of

Answer/ Hint      

Answer : C

Explanation :

8.

For a 4 pole machine wave winding  is impossible with ____armature conductors

Answer/ Hint      

Answer : B

Explanation :

9.

In a dc machine for the same value of  , Z and N; which one of the following statements is correct  ?

Answer/ Hint      

Answer : A

Explanation :

10.

The dummy coils in dc machines are useful to

Answer/ Hint      

Answer : D

Explanation :

11.

A cumulatively compounded dc generator is supplying 20 A at 200 V Now if the series field winding is short circuited the terminal voltage

Answer/ Hint      

Answer : D

Explanation :

12.

A dc generator will be flat compounded if

Answer/ Hint      

Answer : A

Explanation :

13.

Over or under compounding of a dc generator is achieved by

Answer/ Hint      

Answer : B

Explanation :

14.

An over compounded dc generator  is supplying 800A at full load on 500 V. The resistance of each conductor is 0.02Ω. The percentage of compounding is

Answer/ Hint      

Answer : C

Explanation :

15.

Which of the following dc generator is will be in a position to build up without any residual magnetism in the field ?

Answer/ Hint      

Answer : C

Explanation :

16.

Which of the following dc generators has rising V-I characteristics ?

Answer/ Hint      

Answer : A

Explanation :

17.

Which of the following dc generators will have negligible terminal voltage on no load ?

Answer/ Hint      

Answer : B

Explanation :

18.

An exciter for turbo - generator is a dc generator

Answer/ Hint      

Answer : A

Explanation :

19.

For a specific open –circuit voltage of a dc generator, the short circuit current will be maximum when it is

Answer/ Hint      

Answer : C

Explanation :

20.

The voltage regulation of a dc generator at full load being zero implies that the generator is

Answer/ Hint      

Answer : C

Explanation :

21.

The _______generator has the poorest voltage regulation

Answer/ Hint      

Answer : D

Explanation :

22.

The voltmeter connected across a generator reads voltage same  at no load and at full load (rated) The generator is of the type

Answer/ Hint      

Answer : C

Explanation :

23.

A dc shunt generator when driven without connecting filed winding shows an open circuit terminal voltage of 12 V . When filed winding is connected and excited the terminal  voltage drops to ze

Answer/ Hint      

Answer : C

Explanation :

24.

The  residual magnetism of a dc shunt generator can be regained by

Answer/ Hint      

Answer : A

Explanation :

25.

Flashing of field of dc generator means

Answer/ Hint      

Answer : B

Explanation :

26.

A dc series generator is employed

Answer/ Hint      

Answer : A

Explanation :

27.

The type of dc generator used for are welding purposes is a

Answer/ Hint      

Answer : D

Explanation :

28.

The essential condition for satisfactory parallel operation of two dc generators is that they should have same

Answer/ Hint      

Answer : B

Explanation :

29.

The simplest way of shifting load from one shunt generator to  the other operating in parallel is by

Answer/ Hint      

Answer : C

Explanation :

30.

If field of one of two generators operating in parallel is made very weak, then it will

Answer/ Hint      

Answer : C

Explanation :

31.

If a DC generator fails to build up the probable cause could not be

Answer/ Hint      

Answer : B

Explanation :

32.

Flashing the field of DC generator means

Answer/ Hint      

Answer : B

Explanation :

33.

The e.m.f. induced in the armature of a shunt generator is 600 V. the armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be

Answer/ Hint      

Answer : D

Explanation :

34.

In a DC generator the critical resistance refers to the resistance of

Answer/ Hint      

Answer : B

Explanation :

35.

To achieve sparkles commutation brushes of a DC generator are rocked ahead so as to bring them

Answer/ Hint      

Answer : A

Explanation :

36.

Armature coil is short-circuited by brushes when it lies

Answer/ Hint      

Answer : A

Explanation :

37.

A cumulatively compounded long shunt generator when operating as a motor would be

Answer/ Hint      

Answer : B

Explanation :

38.

To avoid formation of grooves in the commutator of a DC machine

Answer/ Hint      

Answer : A

Explanation :

39.

The following constitute short-circuit in the armature winding.

Answer/ Hint      

Answer : D

Explanation :

40.

Number of tapings for each equalizer ring is equal to

Answer/ Hint      

Answer : A

Explanation :

41.

A DC generator can be considered as

Answer/ Hint      

Answer : C

Explanation :

42.

In any rotating machine that part which houses the conductors and in which e.m.f. induced is to be utilised is called

Answer/ Hint      

Answer : D

Explanation :

43.

In a DC machine stray loss is the sum of

Answer/ Hint      

Answer : D

Explanation :

44.

Lap winding is compound of

Answer/ Hint      

Answer : A

Explanation :

45.

In a DC generator in case the resistance of the field winding is increased, then output voltage will

Answer/ Hint      

Answer : A

Explanation :

46.

An exciter for a turbo generator is a

Answer/ Hint      

Answer : B

Explanation :

47.

In case of a flat compounded generator

Answer/ Hint      

Answer : C

Explanation :

48.

Which of the following generator will have negligible terminal voltage while running on no-load?

Answer/ Hint      

Answer : A

Explanation :

49.

Which of the following DC generators will be in a position to build up without any residual magnetism in the poles?

Answer/ Hint      

Answer : D

Explanation :

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DC Generator MCQ Objective Questions and Answers Page - 5