Transformer MCQs Part 19

Transformer MCQs Part 19

Which of following is an advantage of 3-phase transformer over 3 single phase bank of transformers

Which of following is an advantage of 3-phase transformer over 3 single phase bank of transformers:

1. Less weight
2. Less cost
3. Less space is required
4. All of these

Correct answer: 4. All of these

Leakage flux in a transformer results in

Leakage flux in a transformer results in:

1. Voltage drop in windings
2. Increased copper losses
3. Decreased copper losses
4. None of above

Correct answer: 1. Voltage drop in windings

The approximate efficiency of large sized transformers is

The approximate efficiency of large sized transformers is:

1. 35%
2. 50%
3. 70%
4. 95%

Correct answer: 4. 95%

Transformers rated less than 5 kVA are generally

Transformers rated less than 5 kVA are generally

1. Air cooled
2. Oil cooled
3. Water cooled
4. None of these

Correct answer: 1. Air cooled

The transformer is an efficient device since

The transformer is an efficient device since

1. It is a static device
2. It uses inductive coupling
3. It uses capacitive coupling
4. It uses electric coupling

Correct answer: 1. It is a static device

Explanation: Because of its static nature, a transformer has no static and windage losses.