Transformer MCQs Part 21

Transformer MCQs Part 21

Three types of losses in a transformer are

Three types of losses in a transformer are

  1. Copper losses
  2. Hysteresis losses
  3. Eddy current losses

The constant power loss in a transformer is:

  1. a only
  2. a and c only
  3. b and c only
  4. All a, b, and c

Correct answer:  3. b and c only

Short circuit test of transformer is used to determine

Short circuit test of transformer is used to determine:

  1. Iron losses
  2. Cu losses at no load
  3. Full-load Cu losses
  4. None of these

Correct answer: 3. Full-load Cu losses

Which is approximate efficiency of large transformers

Which is approximate efficiency of large transformers:

  1. 55%
  2. 75%
  3. 95%
  4. None of these

Correct answer: 3. 95%

Leakage flux in a transformer

Leakage flux in a transformer:

  1. Helps in transfer of energy
  2. Produces mutually induced emf
  3. Is negligible at full load
  4. Is reduced by interleaving the primary and secondary windings

Correct answer: 4. Is reduced by interleaving the primary and secondary windings

If a transformer core possess air gaps then

If a transformer core possess air gaps then:

  1. Its hysteresis losses are decreased
  2. Magnetizing current increases
  3. Eddy current increases
  4. Reluctance of magnetic path is decreased

Correct answer: 2. Magnetizing current increases

Leave a Reply