Power System Protection MCQs Part 6
a. The component which provides a signal to circuit breaker under the fault condition:
- Isolator
- Fuse
- Relay
- CT
Correct answer: 3. Relay
b. A definite time relay is ___________ the amount of current:
- Dependent on
- Independent of
Correct answer: 2. Independent of
c. The extent of damage and injuries caused due to a shock depends on:
- Amount of current
- Path of the current
- Time for which current flows
- All of these
Correct answer: 4. All of these
d. Problem: Usually, the overvoltage alternator results due to sudden load variation.
Solution: The over-voltage protection system is installed on all power stations.
- The solution is used to solve the problem
- Problem is correct but the solution is not always applied
- Both solution and problem misfit the context
- The problem never happens on alternators
Correct answer: 2. Problem is correct but the solution is not always applied
Explanation: The over-voltage protection system is only installed on those power stations where there is no attendee.
e. Backup protection is installed to:
- Increase the protection reliability of the system
- To increase the speed of protection system
- Both of these
- None of these
Correct answer: 1. Increase the protection reliability of the system
f. The correct statement about the cross-section area of the arc and the resistance:
- The arc resistance increases with the increase of cross-section area
- The arc resistance increases with the decrease of cross-section area
- Both are not related to other
- None of above
Correct answer: 2. The arc resistance increases with the decrease of cross-section area
g. The breaking capacity of the circuit breaker is in _______ and is measured in ________:
- R.M.S, kVA
- R.M.S, MVA
- Peak, kVA
- Peak, MVA
Correct answer: 2. R.M.S, MVA
h. The correct statement about the arc in circuit breaker:
- It is desired to extinguish the arc as quickly as possible
- Delays the current interruption process
- Generates enormous heat
- All of these
Correct answer: 4. All of these
i. Arc extinction is achieved in the air circuit breaker by using:
- Air
- Oil
- SF6
- None of these
Correct answer: 1. Air
j. Semi-open cartridge type fuse can handle current up to ___________:
- 1000 A
- 2500 A
- 4000 A
- 10000 A
Correct answer: 3. 4000 A
Continue reading:
- Power System Protection MCQs Part 1
- Power System Protection MCQs Part 2
- Power System Protection MCQs Part 3
- Power System Protection MCQs Part 4
- Power System Protection MCQs Part 5
- Power System Protection MCQs Part 6
- Power System Protection MCQs Part 7
- Power System Protection MCQs Part 8
- Power System Protection MCQs Part 9
- Power System Protection MCQs Part 10