Power System Protection MCQ Part 8

Power System Protection MCQ Part 8

Power System Protection

The contact wipe in a Circuit breaker is compulsory for the reason being:

1. Increasing speed of opening
2. Decreasing speed of opening
3. Build dielectric strength across the contacts

Correct answer: 3. Build dielectric strength across the contacts

The actuating quantity for relays may be:

1. Frequency
2. Magnitude
3. Phase angle
4. Any of above

Correct answer: 4. Any of above

Modern protection systems prefer which type of relays:

1. Electromechanical
2. Solid state electronics based relays
3. Microprocessor based

Correct answer: 3. Microprocessor based

The operating time of a circuit breaker is very small as compare to fuse:

1. True
2. False

Correct answer: 2. False

Which of following is most common type of arrester found in substations is:

1. Horn gap
2. Rod gap
3. Thyrite

Correct answer: 3. Thyrite