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Switchgear Protections - section-1
  1. The arc voltage produced in A.C. circuit breaker is always

    2. A.

     In phase with the arc current
    B.

     Lagging the arc current by 90°
    C.

     Leading the arc current by 90°
    D.

     None of the above

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  2. Circuit breakers are essentially

    3. A.

     current carrying contacts called electrodes
    B.

     arc extinguishers
    C.

     circuits to break the system
    D.

     transformers to isolate the two systems
    E.

     any of the above

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  3. The interaction between a transmission line and communication line is minimized by

    4. A.

     transposing transmission as well as communication lines
    B.

     increasing the height of the trans-mission line tower
    C.

     increasing the distance between the two lines
    D.

     all of the above

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  4. A transmission line is protected by

    5. A.

     Inrush protection
    B.

     Distance protection
    C.

     Time graded and current graded over current protection
    D.

     Both (B) and (C)

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  5. Which of the following is the least expensive protection for overcurrent is low voltage system ?

    6. A.

     Rewireable fuse
    B.

     Isolator
    C.

     Oil circuit breaker
    D.

     Air break circuit breaker
    E.

     None of the above

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  6. Large internal faults are protected by

    7. A.

     merz price percentage differential protection
    B.

     mho and ohm relays
    C.

     horn gaps and temperature relays
    D.

     earth fault and positive sequence relays

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  7. The short circuit in any winding of the transformer is the result of

    8. A.

     mechanical vibration
    B.

     insulation failure
    C.

     loose connection
    D.

     impulse voltage

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  8. Over voltage protection is recommended for

    9. A.

     hydro-electric generators
    B.

     steam turbine generators
    C.

     gas turbine generators
    D.

     all of the above
    E.

     none of the above

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  9. Overfluxing protection is recommended for

    10. A.

     distribution transformer
    B.

     generator transformer of the power plant
    C.

     auto-transformer of the power plant
    D.

     station transformer of the power plant

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  10. Bus coupler is very essential in arrangement

    11. A.

     single bus
    B.

     double bus, double breaker
    C.

     main and transfer bus
    D.

     all of the above

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