Transformer MCQs Part 29

Electrical Engineering MCQs on Transformer Part 29

The working principle of a Transformer is based on

The working principle of a Transformer is based on:

1. Ampere’s law
2. Coulomb law
3. Principle of self-induction
4. Principle of mutual-induction

Correct answer: 4. Principle of mutual-induction

Excluding distribution transformers, the Power transformers are generally designed to have maximum efficiency at

Excluding distribution transformers, the Power transformers are generally designed to have maximum efficiency at:

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

Correct answer: 3. Near full-load

Open-circuit test on transformer is done on

Open-circuit test on transformer is done on:

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

Correct answer: 1. Low voltage winding

If primary of transformer is connected to dc power supply, then

If primary of transformer is connected to dc power supply, then:

1. Primary leakage reactance will increase
2. Primary draws little to none amount of current
3. Primary might burn
4. Core losses are increased

Correct answer: 3. Primary might burn

The no-load current in the transformer is

The no-load current in the transformer is:

1. Sinusoidal
2. Sinusoidal distorted
3. Steps
4. Straight DC

Correct answer: 2. Sinusoidal distorted