Switchgear and Protection - Electrical Engineering (MCQ)


Switchgear and Protection MCQs. Electrical Engineering. Switchgear and Protection Multiple Choice Questions.


    Question 1: AC network analyser is used to solve problems of?

  • load flow
  • load flow and short-circuit
  • load flow, short-circuit and stability
  • load flow and stability
  • Answers: load flow, short-circuit and stability

    Question 2: .......... relays are used for phase faults on long line?

  • impedance
  • Either of the above
  • Reactance
  • None of the above
  • Answers: impedance

    Question 3: For which of the following protection from negative sequence currents is provided?

  • Transformers
  • Transmission line
  • Motors
  • Generators
  • Answers: Generators

    Question 4: Which of the following devices will receive voltage surge first travelling on the transmission line?

  • Relays
  • Lightning arresters
  • Step-down transformer
  • Switchgear
  • Answers: Lightning arresters

    Question 5: If the fault occurs near the impedance relay, the V/I ratio will be?

  • constant for all distances
  • higher than that of if fault occurs away from the relay
  • lower than that of if fault occurs away from the relay
  • none of the above
  • Answers: lower than that of if fault occurs away from the relay

    Question 6: A fuse is connected?

  • in parallel with circuit
  • none of the above
  • either in series or in parallel with circuit
  • in series with circuit
  • Answers: in series with circuit

    Question 7: The fuse rating is expressed in terms of ?

  • VAR
  • current
  • voltage
  • kVA
  • Answers: current

    Question 8: Oil switches are employed for ?

  • low currents circuits
  • low voltages circuits
  • high voltages and large currents circuits
  • all circuits
  • Answers: high voltages and large currents circuits

    Question 9: The delay fuses are used for the protection of ?

  • motors
  • light circuits
  • power outlet circuits
  • fluorescent lamps
  • Answers: motors

    Question 10: Overheating of relay contacts or contact born out is due to?

  • foreign matter on the contact surface
  • slow making and breaking of load circuit contacts
  • too low contact pressure
  • all of the above
  • Answers: all of the above

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