# Transformer MCQs Part 28

Electrical Engineering MCQs on Transformer MCQs Part 28

## A transformer works on

A transformer works on:

1. AC only
2. DC only
3. Both of these
4. None of these

Explanation: The transformer is an electrical device that changes AC electric power at one voltage level to ac electric power at another voltage level by the action of magnetic field. A transformer comprises of two or more wire coils that are wrapped around common ferromagnetic core.

## The no-load power factor of transformer is small due to which of following reason

The no-load power factor of transformer is small due to which of following reason:

1. Magnetizing component of Io is large
2. Iron loss component of Io is large
3. Magnetizing component of Io is small
4. None of these

Correct answer: 1. Magnetizing component of Io is large

## The ordinary efficiency of a transformer will be maximum when

The ordinary efficiency of a transformer will be maximum when

1. It runs at quarter-full load
2. It runs at half-full load
3. Eddy Current Losses = Copper Losses
4. Copper losses = Iron losses

Correct answer: 4. Copper losses = Iron losses

## Buchholz’s relay can be fixed on

Buchholz’s relay can be fixed on:

1. Air-cooled transformers
2. Auto-transformers
3. Oil cooled transformers
4. Welding transformers

Correct answer: 3. Oil cooled transformers

## The winding of transformer with greater number of turns will be

The winding of transformer with greater number of turns will be:

1. Low voltage winding
2. High voltage winding
3. Either of above
4. None of above

Correct answer: 2. High voltage winding

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