Switchgear & Protection MCQ

Below Switchgear & Protection quiz are Multiple Choice Questions (MCQs) type Quiz. These Switchgear & Protection MCQ Questions helps you to refresh your Switchgear & Protection, you can see the correct option by clicking on it. .
  • 1. 26. Which of the following parameter can be neglected for a short line ?

    • (a) Inductance,
    • (b) Capacitance,
    • c) Resistance,
    • (d) Reactance
  • 2. A fuse performs ........... functions.

    • both detection and interruption
    • interruption
    • detection
    • circuit interruption
  • 3. Bus coupler is very essential in arrangement

    • single bus,
    • double bus, double breaker,
    • main and transfer bus,
    • all of the above.
  • 4. The short circuit in any winding of the transformer is the result of

    • mechanical vibration,
    • insulation failure,
    • loose connection,
    • impulse voltage
  • 5. For which of the following protection from negative sequence currents is provided ?

    • Generators,
    • Motors
    • Transmission line
    • Transformers
  • 6. Wave trap is used to trap waves of

    • Power frequencies,
    • Higher frequencies entering generator or transformer units
    • Either of the above,
    • None of the above.
  • 7. Which of the following statements is incorrect?

    • Station batteries are used to operate relay only
    • The lightning arresters are basically surge diverters
    • An impedance relay has maximum fault current when fault occurs near the relay
    • A high speed relay has an operation of 1 to 2 cycles.
  • 8. In a single bus-bar system there will be complete shut down when

    • fault occurs on the bus itself,
    • fault occurs on neutral line
    • two or more faults occur simultaneously,
    • fault occurs with respect to earthing
  • 9. Underground 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.
  • 10. When a wave propagates on a transmission line, it suffers reflection several times at

    • tapping,
    • load end,
    • sending end,
    • sending and other end
  • 11. For which of the following ratings of the transformer differential protection is recommended ?

    • above 30 kVA.
    • equal to and above 5 MVA,
    • equal to and above 25 MVA,
    • none of the above
  • 12. A voltage source can be converted into constant current source by adding

    • Low resistance in parallel with the voltage source
    • High resistance in parallel with the voltage source
    • Low resistance in series with the voltage source
    • High resistance in series with the voltage source