Electrical Transformer MCQ [Questions with Answers]

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

Electric Transformer MCQ

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


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


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


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


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


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


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


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


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


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

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

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  1. Please give me pdf file for all

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