Switchgear and Protection MCQ Questions

Switchgear and Protection MCQ Questions

The fuse is best defined as a

The fuse is best defined as a:

1. Current Control device
2. Current Limiting device
3. Protection device
4. None of these

Correct answer: 3. Protection device

You might want to see: Power System Protection MCQ Questions

The circuit breaker must be able to perform the function of

The circuit breaker must be able to perform the function of

1. Breaking fault current
2. Opening faulty circuit
3. Carrying fault current for short time
4. All of these

Correct answer: 4. All of these

The fusing factor is always

The fusing factor is always:

1. Less than 1
2. Equal to 1
3. More than 1
4. Any of above is possible

Correct answer: 3. More than 1

The circuit breaker is best defined as a

The circuit breaker is best defined as a:

1. Current Control device
2. Current Limiting device
3. Circuit interruption device
4. None of these

Correct answer: 3. Circuit interruption device

The rating of fuse is expressed in terms of

The rating of fuse is expressed in terms of:

1. Amperes
2. Volts
3. Volt-amperes
4. kVAR

Correct answer: 1. Amperes

In case of fault it is desired that circuit breaker should open

In case of fault it is desired that circuit breaker should open:

1. Manually
2. Automatically
3. Any of above
4. None of above

Correct answer: 2. Automatically

The value of fusing factor for a semi-enclosed fuse employing copper as fuse element is around

The value of fusing factor for a semi-enclosed fuse employing copper as fuse element is around:

1. 0.5
2. 1.5
3. 2
4. 5

Correct answer: 3. 2

Learn more about fusing factor here

Induction relays can be used for

Induction relays can be used for:

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

Correct answer: 1. AC quantities only

Oil in low oil circuit breaker serves to

Oil in low oil circuit breaker serves to:

1. Provide arc extinction
2. Provide insulation
3. Both of above
4. None of above

Correct answer: 1. Provide arc extinction

Which of the below-mentioned fault imposes the severest duty on circuit breaker

Which of the below mentioned fault imposes severest duty on circuit breaker:

1. Line to Ground fault
2. Line to Line fault
3. Line to Line to Line fault
4. Three phase fault

Correct answer: 4. Three phase fault