Electrical Engineering MCQ on Transformer

Contents

- 1 Short circuit test on transformers is conducted to find
- 2 Efficiency of a power transformer is of the order of
- 3 The resistance between primary and secondary of transformers is
- 4 Natural oil cooling is used for transformers up to a rating of
- 5 A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is

## Short circuit test on transformers is conducted to find

Short circuit test on transformers is conducted to find

- Copper losses
- Core losses
- Eddy current losses
- Hysteresis losses

Correct answer: 1. Copper losses

## Efficiency of a power transformer is of the order of

Efficiency of a power transformer is of the order of

- 100 percent
- 25 percent
- 50 percent
- 98 percent

Correct answer: 4. 98 percent

## The resistance between primary and secondary of transformers is

The resistance between primary and secondary of transformers is

- 1 ohm
- 1000 ohms
- Infinite
- Zero

Correct answer: 3. Infinite

## Natural oil cooling is used for transformers up to a rating of

Natural oil cooling is used for transformers up to a rating of

- 1000 kVA
- 250 kVA
- 3000 kVA
- 500 kVA

Correct answer: 3. 3000 kVA

## A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is

A transformer has a 1:6 turns ratio and a secondary coil load resistance of 470 Ω. The load resistance as seen by the source is

- 13 Ω
- 26 Ω
- 52 Ω
- 78 Ω

Correct answer: 1. 13 Ω