Power System Protection MCQ Part 3

Power system protection MCQ Part 3. Go to main

Which one of following is an example of symmetrical fault

Which one of following is an example of symmetrical fault?

1. Phase to phase fault
2. Single phase to earth
3. Two phases to earth
4. Three phase fault

Correct answer: 4. Three phase fault

Generally the clearing time in high speed breakers is around

Generally the clearing time in high speed breakers is around:

1. Few seconds
2. Few minutes
3. 1 to 2 cycles
4. None of above

Correct answer: 3. 1 to 2 cycles

The thermal protection switch provides protection against

The thermal protection switch provides protection against:

1. Short circuits
2. Temperature
3. Overload
4. Over voltages

Correct answer: 3. Overload

In a 3-phase, 4 wire unbalanced system, the magnitude of zero sequence components can be mathematically expressed as

In a 3-phase, 4 wire unbalanced system, the magnitude of zero sequence components can be mathematically expressed as:

1. √3 times of the current in neutral wire
2. 1/3 times of the current in neutral wire
3. ≈ Current in neutral wire
4. None of these

Correct answer: 2. 1/3 times of the current in neutral wire

Arcing voltage will be least in case of

Arcing voltage will be least in case of:

1. Copper
2. Tungsten
3. Carbon
4. Silver

Correct answer: 4. Silver

More PSP MCQs

1. Power System Protection MCQ Part 1
2. Power System Protection MCQ Part 2
3. Power System Protection MCQ Part 3
4. Power System Protection MCQ Part 4
5. Power System Protection MCQ Part 5
6. Power System Protection MCQ Part 6
7. Power System Protection MCQ Part 7
8. Power System Protection MCQ Part 8
9. Power System Protection MCQ Part 9
10. Power System Protection MCQ Part 10