Power system protection MCQs Part 4
Contents
- 1 The basic purpose of a relay is to
- 2 MCQ#2
- 3 Buchholz relay is a _________ relay which is used for protection of _________
- 4 The Insulation test voltage should be done with the parameters
- 5 In Electrical power protection schemes ______________ transformer is used
- 6 CVTs are often used to
- 7 The equipment which has lowest chances of fault occurrence
- 8 Single L – G fault is classified as
- 9 Oil in a circuit breaker is used to
- 10 The _______________ of circuit breaker is always greater than _____________
The basic purpose of a relay is to
a. The basic purpose of a relay is to:
- Detect the fault
- Remove the fault
- Trip the circuit
- All of these
Correct answer: 1. Detect the fault
MCQ#2
b. Statement: The induction relays operate on the principle of the induction motor.
Affirmation: Induction motors can’t be used with dc quantities.
- Both statement and affirmations are correct
- Both are wrong
- The statement is correct but affirmation is wrong
- The statement is wrong but affirmation is correct
Correct answer: 3. The statement is correct but affirmation is wrong
Buchholz relay is a _________ relay which is used for protection of _________
c. Buchholz relay is a _________ relay which is used for protection of _________:
- Gas actuated, transformers
- Gas actuated, generators
- Gas actuated, motors
- Digital, alternator
Correct answer: 1. Gas actuated, transformers
The Insulation test voltage should be done with the parameters
d. The Insulation test voltage should be done with the parameters:
- 2 kV, 50 Hz, 1 min
- 5 kV, 50 Hz, 5 min
- 10 kV, 50 Hz, 10 min
- 20 kV, 50 Hz, 20 min
Correct answer: 1. 2 kV, 50 Hz, 1 min
In Electrical power protection schemes ______________ transformer is used
e. In Electrical power protection schemes ______________ transformer is used:
- VT
- CVT
- Both of these
- None of these
Correct answer: 3. Both of these
Explanation: VT stands for voltage transformer and CVT stands for capacitive voltage transformers
CVTs are often used to
f. CVTs are often used to:
- Protection
- Instrumentation
- Communication
- All of these
Correct answer: 4. All of these
The equipment which has lowest chances of fault occurrence
g. The equipment which has lowest chances of fault occurrence:
- Alternator
- Transformer
- Switchgear
- Induction motors
Correct answer: 1. Alternator
Single L – G fault is classified as
h. Single L – G fault is classified as:
- Symmetrical fault
- Unsymmetrical fault
- Linear fault
- None of these
Correct answer: 2. Unsymmetrical fault
Oil in a circuit breaker is used to
i. Oil in a circuit breaker is used to:
- Quench arc
- Insulate the breaker contacts
- Increase the breaking capacity
- None of these
Correct answer: 1. Quench arc
The _______________ of circuit breaker is always greater than _____________
j. The _______________ of circuit breaker is always greater than _____________:
- Symmetrical breaking capacity, Making capacity
- Making capacity, Symmetrical breaking capacity
- Making capacity, 50000 A
- None of these
Correct answer: 3. Making capacity, Symmetrical breaking capacity
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