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