Switchgear Protection MCQ

Switchgear Protection MCQ | 0 comments

Switchgear And Protection objective questions (MCQ)

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Switchgear and Protection Multiple Choice Questions and Answers for competitive exams. These short objective-type questions with answers are very important.

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    Question 1: The main function of a fuse is to?

  • protect the appliance
  • open the circuit
  • prevent excessive currents
  • protect the line

    • Answers: prevent excessive currents

    Question 2: Arc in a circuit behaves as?

  • a resistance decreasing with voltage rise across the arc
  • an inductive reactance
  • a capacitive reactance
  • a resistance increasing with voltage rise across the arc

    • Answers: a resistance decreasing with voltage rise across the arc

    Question 3: Circuit breakers usually operate under?

  • after dc component has ceased
  • sub-transient state of short-circuit current
  • steady state of short-circuit current
  • transient state of short-circuit current

    • Answers: transient state of short-circuit current

    Question 4: ln a circuit breaker the time duration from the instant of the fault to extinction of arc is known as ?

  • lead time
  • clearing time
  • lag time
  • operation time

    • Answers: clearing time

    Question 5: ln the event of a fault on connected circuit, a circuit breaker will operate ?

  • manually through control switch
  • depends on the design
  • automatically
  • manually

    • Answers: automatically

    Question 6: A circuit breaker will normally operate?

  • when the line is to be checked
  • when the switch is put on
  • when the power is to be supplied
  • whenever fault in the line occurs

    • Answers: whenever fault in the line occurs

    Question 7: A lightning arrester provides ?

  • a high resistance path between line and ground, during operation
  • low impedance path between line and ground, during operation
  • a low resistance path between line and ground, during operation
  • a high impedance path between line and ground, during operation

    • Answers: low impedance path between line and ground, during operation

    Question 8: Surge modifiers are used to?

  • reduce the voltage of wave front
  • reduce the current of wave front
  • reduce the steepness of wave front
  • modify the shape of wave front

    • Answers: reduce the steepness of wave front

    Question 9: An isolator is installed?

  • generally on both sides of a circuit breaker
  • always independent of the position of circuit breaker
  • as a substitute for circuit breaker
  • to operate the relay of circuit breaker

    • Answers: generally on both sides of a circuit breaker

    Question 10: A switchgear is device used for?

  • switching and controlling an electrical circuit
  • switching an electrical circuit
  • interrupting an electrical circuit
  • switching, controlling and protecting the electrical circuit and equipment

    • Answers: switching, controlling and protecting the electrical circuit and equipment

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Total Questions Attempted: 0

Correct: 0 Wrong: 0

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