electrician

MCQ ON ELECTRICAL TRANSFORMER PAGE - 1

1.

The basic function of a transformer is to change

Answer/ Hint      

Answer : A

Explanation :

2.

The two windings of a transformer are

Answer/ Hint      

Answer : B

Explanation :

3.

In an ordinary transformer which of the following does not change

Answer/ Hint      

Answer : C

Explanation :

4.

Transformer action requires a

Answer/ Hint      

Answer : C

Explanation :

5.

The primary and secondary  windings of a power transformer always have

Answer/ Hint      

Answer : A

Explanation :

6.

On removing the cores of a transformer, the production of magnetic flux:

Answer/ Hint      

Answer : A

Explanation :

7.

In a transformer, the linkage of magnetic flux takes place from:

Answer/ Hint      

Answer : C

Explanation :

8.

Since the cores of a transformer are made of silicon steel therefore:

Answer/ Hint      

Answer : C

Explanation :

9.

The efficiency of transformer stands high because

Answer/ Hint      

Answer : B

Explanation :

10.

For equal capacity a shell type transformer as compared to a core type transformer will have

Answer/ Hint      

Answer : B

Explanation :

11.

If the supply frequency of a transformer is reduced then it iron loss will be:

Answer/ Hint      

Answer : A

Explanation :

12.

If the transformers have different voltage ratios (Ep/Es) and their parallel operation is desired then

Answer/ Hint      

Answer : B

Explanation :

13.

The capacity of a star connected transformer as compared to a delta connected transformer will be

Answer/ Hint      

Answer : B

Explanation :

14.

In the breather of a transformer, silica – jelly is used to stop the _____to reach upto the insulating oil

Answer/ Hint      

Answer : C

Explanation :

15.

The principle of working of a transformer is

Answer/ Hint      

Answer : C

Explanation :

16.

A transformer is used for changing the value of

Answer/ Hint      

Answer : A

Explanation :

17.

A transformer operates

Answer/ Hint      

Answer : D

Explanation :

18.

The reactance of a transformer is determined by its:

Answer/ Hint      

Answer : B

Explanation :

19.

The efficiency of a transformer is normally in the rnage of

Answer/ Hint      

Answer : D

Explanation :

20.

Eddy current loss in a transformer can be reduced by

Answer/ Hint      

Answer : B

Explanation :

21.

The main property of a transformer is this that it changes the voltage level of an ac signal

Answer/ Hint      

Answer : D

Explanation :

22.

Transformers are rated in

Answer/ Hint      

Answer : D

Explanation :

23.

What type of core is used in a transformer designed to work at high frequencies (MHz range)?

Answer/ Hint      

Answer : C

Explanation :

24.

If  the secondary turns of a transformer are doubled and at the same time the primary voltage is reduced to half then the secondary voltage will:

Answer/ Hint      

Answer : C

Explanation :

25.

The no-load current of a transformer in terms of full load current is usually

Answer/ Hint      

Answer : B

Explanation :

26.

The transformer oil used in transformers provide:

Answer/ Hint      

Answer : C

Explanation :

27.

Which is the common method of a cooling a power transformer used in distribution work?

Answer/ Hint      

Answer : C

Explanation :

28.

What is the typical use of an auto - transformer?

Answer/ Hint      

Answer : C

Explanation :

29.

As compared to an amplifier a transformer cannot

Answer/ Hint      

Answer : A

Explanation :

30.

A conservator used in a transformer consist of

Answer/ Hint      

Answer : A

Explanation :

31.

In a power transformer, the winding nearer to the iron core

Answer/ Hint      

Answer : C

Explanation :

32.

A good transformers oil should be free from

Answer/ Hint      

Answer : D

Explanation :

33.

The two transformers operated in parallel will share the load depending  upon their  :

Answer/ Hint      

Answer : D

Explanation :

34.

In an ideal transformer, the no-load primary current Io:

Answer/ Hint      

Answer : A

Explanation :

MCQ ON ELECTRICAL TRANSFORMER PAGE - 1
Next >>