Transformer MCQ Part 2

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Transformer MCQ Part 2.

The primary and secondary of a transformer are coupled

The primary and secondary of a transformer are coupled:

  1. Magnetically
  2. Electrically
  3. Both of above
  4. None of above

Correct answer: 1. Magnetically

The no-load input power to a transformer practically equals which type of loss in transformer

The no-load input power to a transformer practically equals which type of loss in transformer:

  1. Copper loss
  2. Iron loss
  3. Eddy current losses

Correct answer: 2. Iron loss

The efficiency of a transformer will be zero at which condition

The efficiency of a transformer will be zero at which condition:

  1. No load
  2. Half load
  3. 3/4 of full load
  4. Full load

Correct answer: 1. No load

As compared to commercial efficiency, the all day efficiency of transformer is

As compared to commercial efficiency, the all day efficiency of a transformer is:

  1. Less
  2. Same
  3. More

Correct answer: 1. Less

Generally which type of cooling method is recommended for transformers that are rated below 5 kVA

Generally which type of cooling method is recommended for transformers that are rated below 5 kVA:

  1. Water cooling
  2. Oil cooling
  3. Forced water cooling
  4. Air cooling

Correct answer: 4. Air cooling

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