electrical

DC Generator MCQ Objective Questions and Answers Page - 1

1.

In an electromechanical energy conversion device, the developed torque depends upon

Answer/ Hint       Comment On Question

Answer : C

Explanation :

2.

In electromechanical energy conversion devices (e.g generators and motors) a small air gap is left between the stator and the rotor in order to

Answer/ Hint       Comment On Question

Answer : C

Explanation :

3.

If a current carrying coil is placed in a uniform magnetic field direction of magnetic induction, then

Answer/ Hint      

Answer : A

Explanation :

4.

Reluctance torque in rotating machines is present , when

Answer/ Hint      

Answer : D

Explanation :

5.

A rotating electrical machine having its self inductacnes of both the stator and the stator windings, independent of rotor position will definitely not develop.

Answer/ Hint      

Answer : B

Explanation :

6.

A circular metallic disc is placed in a vertical magnetic field of constant induction in the downward direction. If the disc is rotated in a horizontal plane, the emf induced will be

Answer/ Hint      

Answer : A

Explanation :

7.

The emf induced in a conductor rotating in a bipolar field is

Answer/ Hint       Comment On Question

Answer : B

Explanation :

8.

A  conductor is rotating within a magnetic filed. At which of the position do the peak voltages occur?

Answer/ Hint      

Answer : B

Explanation :

9.

EMF induced in a coil rotating in a uniform magnetic filed will be maximum when the

Answer/ Hint      

Answer : C

Explanation :

10.

A homopolar generator usually has

Answer/ Hint      

Answer : B

Explanation :

11.

In a dc generator, the ripples in the direct emf generated are  reduced by employing

Answer/ Hint      

Answer : A

Explanation :

12.

In order to ascertain whether a dc machine is lap wound or wave wound on the basis of visual observation of the armature, one should observe the

Answer/ Hint      

Answer : D

Explanation :

13.

The coil span

Answer/ Hint      

Answer : C

Explanation :

14.

The  coil span

Answer/ Hint      

Answer : C

Explanation :

15.

The commutator pitch for simplex wave winding is equal  to

Answer/ Hint      

Answer : C

Explanation :

16.

In a dc machine armature winding, the number of commutator segments is equal to the number of armature

Answer/ Hint      

Answer : A

Explanation :

17.

How many segments will be there for the commutator of a 6-pole dc machine having a simple wave wound armature with 72 slots

Answer/ Hint      

Answer : B

Explanation :

18.

For both lap and wave windings, there are as many commutator bars as the number of

Answer/ Hint      

Answer : B

Explanation :

19.

In a drum type dc armature winding the back pitch and front pitch in terms of the coil sides must be

Answer/ Hint      

Answer : D

Explanation :

20.

In a dc machine, fractional pitch winding is employed to

Answer/ Hint       Comment On Question

Answer : D

Explanation :

21.

In a dc machine, the armature winding is made up of number of coils distributed in large number of armature slots instead of placing all the coils into two slots to

Answer/ Hint      

Answer : D

Explanation :

22.

Aluminium is not used as winding wire in dc machine armature as it

Answer/ Hint      

Answer : D

Explanation :

23.

Short circuiting is caused in the armature winding due to

Answer/ Hint      

Answer : D

Explanation :

24.

In a lap wound dc generator , the equalizer rings are provided to

Answer/ Hint      

Answer : C

Explanation :

25.

In a lap wound dc generator haivn P poles and Z conductors the maximum number of equalizer rings will be

Answer/ Hint      

Answer : A

Explanation :

26.

Number of tappings to each equalizer ring is equal to number of

Answer/ Hint      

Answer : B

Explanation :

27.

A frog leg winding is used in a dc machine to eliminate

Answer/ Hint      

Answer : A

Explanation :

28.

A 250 V dc generator is run at rated speed with no excitation . The open circuit voltage will be

Answer/ Hint      

Answer : B

Explanation :

29.

At a certain speed and flux, the voltage generated by dc generator is 230 volts. If the speed is increased by 20% and the flux is simultaneously reduced by 10% , the voltage will be

Answer/ Hint      

Answer : C

Explanation :

30.

The function of compensating winding is to neutralize

Answer/ Hint      

Answer : C

Explanation :

DC Generator MCQ Objective Questions and Answers Page - 1
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