Power System Protection MCQs Part 5
a. Usually, busbars are not protected because:
- Backup protection is quite enough
- Usually, earth faults occur which don’t require fast protection
- CT’s are very expensive
- All of these
Correct answer: 4. All of these
b. A distance relay actually measures:
- Current
- Voltage
- Impedance
- None of these
Correct answer: 3. Impedance
c. The loss of excitation in a generator is classified as:
- Mechanical fault
- Electrical fault
Correct answer: 2. Electrical fault
d. Most unit protection schemes are based on:
- Merz Price principle
- Combinational Buchholz relay system
- Induction principle
- None of these
Correct answer: 1. Merz Price principle
e. Generally, a Frame-leakage check is used for protection of:
- Alternator
- DC generators
- Transformers
- Bus bars
Correct answer: 4. Bus bars
f. ___________ can be used to protect insulation failure in a.c generators:
- Resistors
- Reactors
- Transformers
- All of these
Correct answer: 4. All of these
g. Interturn faults on an alternator are _________ and are ___________ detectable:
- Common, easily
- Uncommon, easily
- Uncommon, not easily
- Common, not easily
Correct answer: 3. Uncommon, not easily
h. Peterson coil is actually a:
- Tunable reactor
- Simple resistors
- Transformer with five windings
- A reactance (either cap or inductive)
Correct answer: 1. Tunable reactor
i. The term effective earthing refers to the earthing which is done through:
- Resistance
- Reactance
- Transformer
- None of these
Correct answer: 4. None of these
j. A fuse acts as:
- Fault detector
- Interruptor
- Both of these
- None of these
Correct answer: 3. Both of these
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