Switchgear Protection MCQ

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Electrical Engineering Questions and Answers | Switchgear And Protection MCQ

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Important MCQ on Switchgear and Protection. Attempt Free Electrical Switchgear Protections Questions Here. Read The Important Electrical Switchgear Protections MCQ.

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    Question 1: Which of the following is used in liquid fuses ?

  • Transformer oil
  • Sulphur hexafluoride
  • Carbon tetrachloride
  • Distilled water

    • Answers: Carbon tetrachloride

    Question 2: Which of the following parameter can be neglected for a short line ?

  • Capacitance
  • Reactance
  • Resistance
  • Inductance

    • Answers: Capacitance

    Question 3: Protection by fuses is generally not used beyond ?

  • 200 A
  • 20 A
  • 50 A
  • 100 A

    • Answers: 100 A

    Question 4: The fuse blows off by ?

  • arcing
  • melting
  • burning
  • none of the above

    • Answers: melting

    Question 5: What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

  • Infinity
  • Unity
  • Zero
  • None of the above

    • Answers: Zero

    Question 6: To reduce short circuit fault currents .......... are used ?

  • capacitors
  • resistors
  • none of the above
  • reactors

    • Answers: reactors

    Question 7: Bus coupler is very essential in ...... arrangement ?

  • all of the above
  • main and transfer bus
  • single bus
  • double bus, double breaker

    • Answers: main and transfer bus

    Question 8: Ungrounded neutral transmission system is not recommended because of system ?

  • insulation being overstressed due to over voltages
  • insulation overstress may lead to failure and subsequent phase to phase faults
  • being inadequately protected against ground fault
  • all of the above

    • Answers: being inadequately protected against ground fault

    Question 9: The ground wire should not be smaller than No ....... copper ?

  • 10
  • 4
  • 2
  • 6

    • Answers: 10

    Question 10: The arc voltage produced in A.C. circuit breaker is always ?

  • lagging the arc current by 90º
  • none of the above
  • leading the arc current by 90º
  • in phase with the arc current

    • Answers: in phase with the arc current

Report Card

Total Questions Attempted: 0

Correct: 0 Wrong: 0

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