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MCQ ON ELECTRICAL TRANSFORMER PAGE - 2

1.

Which of the following reduces high voltage and current to safe values of measurement?

Answer/ Hint      

Answer : D

Explanation :

2.

The transformer used for starting, the high induction motor is :

Answer/ Hint      

Answer : B

Explanation :

3.

Which one of the following methods will be preferred for a 10 MVA  transformer?

Answer/ Hint      

Answer : D

Explanation :

4.

Scott connections are used to transform:

Answer/ Hint      

Answer : A

Explanation :

5.

In a 3 phase delta transformer. One of the phase windings has burnt. The transformer will then supply

Answer/ Hint      

Answer : D

Explanation :

6.

Which type of connection in 3 phase transformer is used for the sub-station end of the transmission lines?

Answer/ Hint      

Answer : B

Explanation :

7.

In three phase transformer, different methods of connection are possible. Which type of connection used in distribution transformer?

Answer/ Hint      

Answer : D

Explanation :

8.

Which type of transformer winding has no ohmic resistance and no magnetic leakage resulting in no losses?

Answer/ Hint      

Answer : C

Explanation :

9.

The rated value of secondary voltage for single phase and three phase potential transformer as per IS,3156 shall be ….

Answer/ Hint      

Answer : D

Explanation :

10.

In a transformer, the number of turns per volt is 6. The primary and secondary voltages are 240 V and 32 V respectively. Find the number of primary and secondary winding turns?

Answer/ Hint      

Answer : C

Explanation :

11.

A 10 kVA transformer is taking power of 400 watts in open circuit test and 900 watts in short circuit test. What will be the copper loss at 50 % of load?

Answer/ Hint      

Answer : C

Explanation :

12.

What will be the copper loss at half load, of the full load copper loss in 1600 watts?

Answer/ Hint      

Answer : C

Explanation :

13.

The wattmeter reading of transformer on open circuit test is 900 W and on short circuit test at full load current is 1600 W. What will be the iron loss at half full load?

Answer/ Hint      

Answer : B

Explanation :

14.

The copper loss of the transformer during the maximum efficiency is 1000 watts, what will be the iron loss?

Answer/ Hint      

Answer : B

Explanation :

15.

The efficiency of a transformer is at a maximum value when the ……

Answer/ Hint      

Answer : A

Explanation :

16.

Generally, a transformer has the efficiency of …

Answer/ Hint      

Answer : D

Explanation :

17.

Results of a transformer with a rating of 15kVA, 1100W , 220V 50Hz are obtained, while testing short circuit test power input = 510 watts

Open circuit test power input =252 watts

Wh

Answer/ Hint      

Answer : D

Explanation :

18.

What is the maximum load upto which an open deltas transformer can safely maintain supply to load ?

Answer/ Hint      

Answer : C

Explanation :

19.

What is the cause for producing humming notice in the transformer core?

Answer/ Hint      

Answer : C

Explanation :

20.

No load loss of a transformer has two components They are eddy current and hysteresis loss. In which part of a transformer hysteresis loss will occur?

Answer/ Hint      

Answer : A

Explanation :

21.

Which material is used for the construction of the power transformer core?

Answer/ Hint      

Answer : D

Explanation :

22.

Which type of transformer does not isolate the secondary?

Answer/ Hint      

Answer : B

Explanation :

23.

Voltage stabilizers are having auto transformer with tapings or stepless variation depending upon the type of stabilizer. Auto transformer in servo stabilizer is of ….

Answer/ Hint      

Answer : C

Explanation :

24.

Single turn primary of a current transformer has a turns ratio 10:1. Which one f the following is the primary current if the current measured in secondary is 2 amperes?

Answer/ Hint      

Answer : D

Explanation :

25.

As compared to the secondary of a step up transformer the primary will have …..

Answer/ Hint      

Answer : D

Explanation :

26.

In a transformer, if the number of turns in the secondary winding is twice that in the primary winding, the secondary voltage will be …

Answer/ Hint      

Answer : C

Explanation :

27.

Which one of the following can be increased by using a step-up transformer?

Answer/ Hint      

Answer : B

Explanation :

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