Transformer MCQs Part 38

Electrical Engineering MCQ on Transformer

In actual transformer the iron loss remains practically constant from no load to full load that is because of

In actual transformer the iron loss remains practically constant from no load to full load that is because of

1. Core flux remains practically constant
2. Permeability of transformer core remains constant
3. Primary voltage remains constant
4. Value of transformation ratio remains constant

Correct answer: 1. Core flux remains practically constant

In a transformer the tappings are usually provided on

In a transformer the tappings are usually provided on

1. High voltage side
2. Low voltage side
3. Primary side
4. Secondary side

Correct answer: 1. High voltage side

Power transformers are usually designed to have maximum efficiency around what load value

Power transformers are usually designed to have maximum efficiency around what load value

1. 10% overload
2. Half-load
3. Near full-load
4. No-load

Correct answer: 3. Near full-load

A transformer cannot raise or lower the voltage of a DC Supply, that is since

A transformer cannot raise or lower the voltage of a DC Supply, that is since

1. A DC Circuit has more losses
2. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero
3. There is no need to change the DC Voltage
4. None of above

Correct answer: 2. Faraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero

The transformer laminations are insulated from each other using

The transformer laminations are insulated from each other using

1. Mica strip
2. Paper
3. Thin coat of varnish
4. Any of above

Correct answer: 3. Thin coat of varnish