Transformer MCQ

Welcome to your Transformer MCQ

What is a Transformer?

Transformer is a device used to convert low alternating voltage to a high alternating voltage

Transformer is a device used to convert alternating current to direct current

Transformer is a device used to convert low alternating current to a high alternating current

Transformers are used only for low alternating voltage

None

What is the working principle of a Transformer?

Transformer works on the principle of self induction

Transformer works on the principle of mutual induction

Transformer works on the principle of ampere law

Transformer works on the principle of coulomb law

None

What is a transformer's function?

Transformer is used to step down or up the AC voltages and currents

Transformer is used to step down or up the DC voltages and currents

Transformer converts DC to AC voltages

Transformer converts AC to DC voltages

None

What happens to the secondary voltage generated by a transformer when its supply frequency (f) decreases?

Remain the same

Increases

Decreases

All of these

None

Which of the following tests is used to measure the efficiency of two identical transformers under load conditions?

Low voltage test

Full - load test

Back-to-Back (Sumpner's Test)

Open circuit test.

None

What is a current transformer?

Transformer used with an A.C. voltmeter

Transformer used with an A.C. ammeter

Transformer used with an D.C. voltmeter

Transformer used with an D.C. ammeter

None

Which of the following does not constitute a part of transformer installation?

Breather

Conservator

Exciter

Buchholz relay

None

What is the thickness of the laminations used in a transformer?

4 mm to 15 mm

25 mm to 40 mm

0.1 mm to 0.5 mm

4 mm to 5 mm

None

What happens when a transformer is linked to a direct current supply?

Damage the transformer

No effect

Operate with low frequency

Operate with high frequency

None

10.

In a standard transformer, which of the following does not change?

Current

Frequency

Voltage

All of the above

None

11.

Which of the following tests determines the transformer's iron loss?

Short circuit test

Back-to-back test

Open circuit test

Both option a & b

None

12.

With a three-phase shell type transformer, what type of winding is used?

Square type

Circular type

Sandwich type

Cylindrical type

None

13.

Which of the given winding of the transformer has less cross-sectional area?

Primary winding

Low voltage winding

High voltage winding

Secondary winding

None

14.

Which of the following transformer's secondary winding is usually maintained closed?

Voltage transformer

Current transformer

Step-up transformer

Power transformer

None

15.

Which of the mentioned transformer losses varies with the load?

Copper loss

Iron loss

Core loss

None of these

None

16.

What does the secondary output voltage of a transformer change to when the supply frequency increases?

Decreases

Increases

Constant

None of these

None

17.

Which type of flux is required for transformer action?

Alternating electric flux

Alternating magnetic flux

Increasing magnetic flux

Constant magnetic flux

None

18.

Which of the following transformer, Buchholz’s relay can be fixed on?

Welding transformers

Oil Immersed (cooled) transformers

Auto-transformers

Air-cooled transformers

None

19.

What is the purpose of a transformer breather?

To arrest flow of moisture when outside air enters the transformer

To cool the transformer oil

To provide oxygen inside the tank

To cool the coils during reduced load

None

20.

What is the primary advantage of an auto-transformer over a two-winding transformer?

Eddy losses are totally eliminated

Copper losses are negligible

Saving in winding material

Hysteresis losses are reduced

None

21.

Which of the following is the most important factor to consider when constructing transformers to be utilised in electronic applications?

Constant amplitude voltage gain

Perfect DC isolation, maximum efficiency and constant voltage gain

Perfect DC isolation

Maximum efficiency

None

22.

Which of the following is not a standard transformer test?

Polarity test

Radio interference test

Core insulation voltage test

Impedance test

None

23.

Why is a shell type three-phase transformer utilised in high-power transforming applications?

Due to other reasons

More height and less height flexibility

Can be made with less height

Can be made with more height

None

24.

What is the no-load current in the transformer?

Non-Sinusoidal

Sinusoidal

Steps

Straight DC

None

25.

Which transformer insulation material is better than Kraft paper?

Asbestos

Oil

Cotton

Low grade pressboard

None

1 out of 25

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