Practice Test: Question Set - 04
1. The short circuit in any winding of the transformer is the result of
- (A) Mechanical vibration
- (B) Insulation failure
- (C) Loose connection
- (D) Impulse voltage
2. The relay with inverse time characteristic will operate within
- (A) 1.5 sec
- (B) 5 to 10 sec
- (C) 5 to 20 sec
- (D) 20 to 30 sec
3. What will be the reflection coefficient of the wave of load connected to transmission line if surge impedance of the line is equal to load?
- (A) Zero
- (B) Unity
- (C) Infinity
- (D) None of the above
4. The torque produced in induction type relay (shaded pole structure) is
- (A) Inversely proportional to the current
- (B) Inversely proportional to the square of the
current
- (C) Proportional to the current
- (D) Proportional to square of the current
5. Protection by fuses is generally not used beyond
- (A) 20 A
- (B) 50 A
- (C) 100 A
- (D) 200 A
6. A balanced 3-phase system consists of
- (A) Zero sequence currents only
- (B) Positive sequence currents only
- (C) Negative and zero sequence currents
- (D) Zero, negative and positive sequence
currents
7. On which of the following routine tests are conducted?
- (A) Oil circuit breakers
- (B) Air blast circuit breakers
- (C) Minimum oil circuit breakers
- (D) All of the above
8. Overload relays are of _________ type.
- (A) Induction
- (B) Solid state
- (C) Thermal
- (D) All above
9. Burden of a protective relay is the power
- (A) Required to operate the circuit breaker
- (B) Absorbed by the circuit of relay
- (C) Developed by the relay circuit
- (D) None of the above
10. Interruption of large currents by relay requires
- (A) Arc suppressing blow out coils
- (B) Wide separation of the opened contacts
- (C) High speed opening of contacts
- (D) All of the above
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