Switchgear Protections(Engineering > Electrical Engineering ) Questions and Answers

Question 1. The power loss is an important factor for the design of
  1.    transmission line
  2.    motor
  3.    generator
  4.    feeder
Explanation:-
Answer: Option A. -> transmission line
Question 2. The single phasing relays are used for the protection of
  1.    single phase motors only
  2.    two phase motors only
  3.    two single phase motors running in parallel
  4.    three phase motors
Explanation:-
Answer: Option D. -> three phase motors
Question 3. The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
  1.    lubricate the contacts
  2.    insulate the contacts from switch body
  3.    extinguish the arc
  4.    all of the above
  5.    none of the above
Explanation:-
Answer: Option C. -> extinguish the arc
Question 4. To limit short-circuit current in a power system are used
  1.    earth wires
  2.    isolators
  3.    H.R. fuses
  4.    reactors
Explanation:-
Answer: Option D. -> reactors
Question 5. Series capacitors are used to
  1.    compensate for line inductive reactance
  2.    compensate for line capacitive reactance
  3.    improve line voltage
  4.    none of the above
Explanation:-
Answer: Option A. -> compensate for line inductive reactance
Question 6. In a single bus-bar system there will be complete shut down when
  1.    fault occurs on the bus itself
  2.    fault occurs on neutral line
  3.    two or more faults occur simultaneously
  4.    fault occurs with respect to earthing
Explanation:-
Answer: Option A. -> fault occurs on the bus itself
Question 7. A differential relay measures the vector difference between
  1.    two currents
  2.    two voltages
  3.    two or more similar electrical quantities
  4.    none of the above
Explanation:-
Answer: Option C. -> two or more similar electrical quantities
Question 8. With which of the following, a circuit breaker must be equipped for remote operation ?
  1.    Inverse time trip
  2.    Time-delay trip
  3.    Shunt trip
  4.    None of the above
  5.    All of the above
Explanation:-
Answer: Option C. -> Shunt trip
Question 9. A switchgear is device used for
  1.    interrupting an electrical circuit
  2.    switching an electrical circuit 111
  3.    switching and controlling an electrical circuit
  4.    switching, controlling and protecting the electrical circuit and equipment
Explanation:-
Answer: Option D. -> switching, controlling and protecting the electrical circuit and equipment
Question 10. A _______ is used to measure the stator % winding temperature of the generator.
  1.    thermocouple
  2.    pyrometer
  3.    resistance thermometer
  4.    thermometer
Explanation:-
Answer: Option C. -> resistance thermometer
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