Electrical Transformer MCQ [Questions with Answers]

A transformer is an electrical device that steps the ac voltage from one level to another.

A transformer works on

A transformer works on:

1. AC only
2. DC only
3. Both of these

Correct answer: 1. AC only

A transformer performs conversion

A transformer performs conversion:

1. AC to DC
2. DC to AC
3. AC from one level to other
4. DC from one level to other

Correct answer: 3. AC from one level to other

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The windings of the power transformer are

The windings of the power transformer are:

1. Physically linked
2. Inductively linked
3. Chemically linked
4. Not linked at all

Correct answer: 2. Inductively linked

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A transformer requires

A transformer requires:

1. Damped magnetic flux
2. Constant magnetic flux
3. Decreases magnetic flux
4. Alternating magnetic flux

Correct answer: 4. Alternating magnetic flux

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Keeping constant voltage, by increasing the supply frequency of the transformer the magnetising component

Keeping constant voltage, by increasing the supply frequency of the transformer the magnetising component:

1. Increases
2. Decreases
3. Will remain the same
4. Any of these

Correct answer: 2. Decreases

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With an increase in load, the flux in the transformer core

With an increase in load, the flux in the transformer core:

1. Increases
2. Decreases
3. Remains same
4. Any of these

Correct answer: 3. Remains same

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Short circuit test is used to measure

Short circuit test is used to measure:

1. Copper losses only
2. Core losses only
3. Both of these
4. None of these

Correct answer: 1. Copper losses only

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Open circuit test is used to measure

Open circuit test is used to measure:

1. Copper losses only
2. Core losses only
3. Both of these
4. None of these

Correct answer: 2. Core losses only

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A transformer with 10 number of primary turns and 20 number of secondary turns, having vp = 10 V will provide Vs

A transformer with 10 number of primary turns and 20 number of secondary turns, having vp = 10 V will provide Vs:

1. 5
2. 10
3. 15
4. 20

Correct answer: 4. 20

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If we want to operate a 60 Hz transformer on 50 Hz, the applied voltage

If we want to operate a 60 Hz transformer on 50 Hz, the applied voltage:

1. Should be reduced by one fifth
2. Should be increased by one fifth
3. Should be reduced by one-sixth
4. Should be increased by one-sixth

Correct answer: 3. Should be reduced by one sixth

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Generally a transformer having rating 5 kVA is

Generally a transformer having rating 5 kVA is:

1. Natural air-cooled
2. Oil cooled
3. Water-cooled
4. Pressurized water-cooled

Correct answer: 1. Natural air-cooled

The transformer winding having a greater number of turns is

The transformer winding having a greater number of turns is:

1. High voltage winding
2. Low voltage winding
3. Any of these

Correct answer: 1. High voltage winding

Explanation: From formula:

V_p/V_s = N_p/N_s

A transformer core having air gap has expected to have

A transformer core having air gap has expected to have:

1. Decreased hysteresis losses
2. Increased magnetizing current
3. Increased eddy currents
4. None of these

Correct answer: 2. Increased magnetizing current

A transformer is efficient device for the reason being

A transformer is efficient device for the reason being:

1. It uses capacitive coupling
2. It uses inductive coupling
3. It has two coils
4. It is static device

Correct answer: 4. It is static device

Unlike other rotating machines (like synchronous motors, induction motors) a transformer is a static device meaning it does not have any rotating parts. Thus a transformer has no mechanical losses which increase the efficiency of the transformer.

More Questions by Parts on Transformers:

1. Transformer MCQ Questions Part 1
2. Transformer MCQ Questions Part 2
3. Transformer MCQ Questions Part 3
4. Transformer MCQ Questions Part 4
5. Transformer MCQ Questions Part 5
6. Transformer MCQ Questions Part 6
7. Transformer MCQ Questions Part 7
8. Transformer MCQ Questions Part 8

More Transformers MCQ

1. Buchholz relay is best classified as
2. Flux in the transformer core is related to load
3. Humming in transformers happen due to
4. In a transformer, the energy is conveyed from primary to secondary through
5. Overheating of Transformer Happens Due to
6. Solid earthing a power transformer means
7. The chemical used in breather of transformer is
8. The current transformers that are used to protect power transformer with star-delta connection against the earth and phase faults should be connected in which configuration
9. The efficiency of a transformer will be maximum at which of following conditions
10. The mechanical vibrations of the transformer’s laminations depend on
11. The No-load current of Transformer is usually what percent of its full load
12. The pick-up current of a 100/5 transformer having a current setting of 200% will be
13. The transformer core is laminated in order to reduce
14. Transformer Rating is expressed in
15. Usually a Good Voltage regulation of transformer means
16. What will happen If DC supply is given to a transformer
17. Which of the following does not change in a transformer [Current, Voltage, or Frequency]
18. Which one of the following is the acceptable dielectric strength of transformer oil
19. A vessel connected to the conservator tank of transformer is known as
20. During Transformer short-circuit test which side of transformer is short-circuited
21. Open circuit test is performed on the transformer to determine
22. Transformer Short circuit test is used to determine which type of losses
23. In electric transformer, the path of a magnetic flux should have
24. The primary and secondary winding are wrapped on each other to reduce
25. A vessel connected to the conservator tank of transformer is known as
26. The hysteresis and eddy current losses in the transformer depend on what factors
27. Conservator in a transformer is installed to perform which function
28. Distribution transformers should be designed to have maximum efficiency