Switchgear Protection MCQ

Switchgear Protection MCQ | 0 comments

MCQs on Power Systems | Important MCQ Of Switchgear Protection

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Most Asked MCQ Of Switchgear & Protection (SAP) On Fuse, Relay & Circuit Breaker. Electrical Engineering Department Subject- Switchgear Protection Type of Questions- multiple choice questions (MCQ) Type of attachment.

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    Question 1: Which of the following statements is incorrect?

  • The peak short current is (1.8 x root2) times the AC component
  • Shunt reactors are used as compensation reactors
  • Lightning arrestors are used before the switchgear
  • The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

    • Answers: Lightning arrestors are used before the switchgear

    Question 2: ........ transmission line has reflection coefficient as one?

  • Open circuit
  • None of the above
  • Long
  • Short-circuit

    • Answers: Open circuit

    Question 3: Over voltage protection is recommended for?

  • gas turbine generators
  • hydro-electric generators
  • steam turbine generators
  • all of the above

    • Answers: all of the above

    Question 4: Air blast circuit breakers for 400 kV power system are designed to operate ln?

  • 0.5 sec
  • milli-second
  • 0.1 sec
  • 100 micro-second

    • Answers: milli-second

    Question 5: The material used for fuse must have?

  • high melting point and low specific resistance
  • low melting point and any specific resistance
  • low melting point and high specific resistance
  • low melting point and low specific resistance

    • Answers: low melting point and high specific resistance

    Question 6: The steady state stability of the power system can be increased by?

  • using machines of high impedance
  • connecting lines in series
  • reducing the excitation of machines
  • connecting lines in parallel

    • Answers: connecting lines in parallel

    Question 7: A transmission line is protected by?

  • inrush protection
  • both (b) and (d)
  • distance protection
  • time graded and current graded over current protection

    • Answers: both (b) and (d)

    Question 8: Magnetic circuit breaker has ...... trip action?

  • delayed
  • none of the mention
  • instantaneous
  • both of the above

    • Answers: instantaneous

    Question 9: Large internal faults are protected by?

  • merz price percentage differential protection
  • earth fault and positive sequence relays
  • mho and ohm relays
  • horn gaps and temperature relays

    • Answers: merz price percentage differential protection

    Question 10: Thermal overload relays are used to protect the motor against over current due to ?

  • grounds
  • short-circuits
  • all of the above
  • heavy loads

    • Answers: heavy loads

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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