Practice Test: Question Set - 07
1. Which of the following statements is incorrect?
- (A) Station batteries are used to operate relay only
- (B) The lightning arresters are basically surge
diverters
- (C) An impedance relay has maximum fault current when
fault occurs near the relay
- (D) A high speed relay has an operation of 1 to
2 cycles
2. H.R.C. fuses provide best protection against
- (A) Overload
- (B) Reverse current
- (C) Open-circuits
- (D) Short-circuits
3. A _________ is used to measure the stator % winding temperature of the generator.
- (A) Thermocouple
- (B) Pyrometer
- (C) Resistance thermometer
- (D) Thermometer
4. The material used for fuse must have
- (A) Low melting point and high specific
resistance
- (B) Low melting point and low specific resistance
- (C) High melting point and low specific resistance
- (D) Low melting point and any specific resistance
5. A thermal protection switch can protect against
- (A) Short-circuit
- (B) Temperature
- (C) Overload
- (D) Over voltage
6. Oil switches are employed for
- (A) Low currents circuits
- (B) Low voltages circuits
- (C) High voltages and large currents circuits
- (D) All circuits
7. When a transmission line is energized, the wave that propagates on it is
- (A) Current wave only
- (B) Voltage wave only
- (C) Both (A) and (B)
- (D) Power factor wave only
8. Ungrounded neutral transmission system is not recommended because of system
- (A) Insulation being overstressed due to over voltages
- (B) Insulation overstress may lead to failure and
subsequent phase to phase faults
- (C) Being inadequately protected against ground
fault
- (D) All of the above
9. For which of the following protection from negative sequence currents is provided?
- (A) Generators
- (B) Motors
- (C) Transmission line
- (D) Transformers
10. Series capacitors are used to
- (A) Compensate for line inductive reactance
- (B) Compensate for line capacitive reactance
- (C) Improve line voltage
- (D) None of the above
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