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Switchgear Protections - section-1
  1. The relay operating speed depends upon

    2. A.

     the spring tension
    B.

     the rate of flux built up
    C.

     armature core air gap
    D.

     all of the above

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  2. The fuse blows off by

    3. A.

     burning
    B.

     arcing
    C.

     melting
    D.

     none of the above

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  3. If the fault occurs near the impedance relay, the VII ratio will be

    4. A.

     constant for all distances
    B.

     lower than that of if fault occurs away from the relay
    C.

     higher than that of if fault occurs away from the relay
    D.

     none of the above

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  4. Oil switches are employed for

    5. A.

     low currents circuits
    B.

     low voltages circuits
    C.

     high voltages and large currents circuits
    D.

     all circuits

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  5. Which of the following circuit breakers has high reliability and minimum maintenance ?

    6. A.

     Air blast circuit breakers
    B.

     Circuit breaker with SF6 gas
    C.

     Vacuum circuit breakers
    D.

     Oil circuit breakers

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  6. For which of the following ratings of the transformer differential protection is recommended ?

    7. A.

     above 30 kV
    B.

     equal to and above 5 MVA
    C.

     equal to and above 25 MVA
    D.

     none of the above

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  7. When a wave propagates on a transmission line, it suffers reflection several times at

    8. A.

     tapping
    B.

     load end
    C.

     sending end
    D.

     sending and other end
    E.

     all of the above

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  8. Which of the following medium is employed for extinction of arc in air circuit breaker ?

    9. A.

     Water
    B.

     Oil
    C.

     Air
    D.

     SF6

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  9. Protective relays are devices that detect abnormal conditions in electrical circuits by measuring

    10. A.

     current during abnormal condition
    B.

     voltage during abnormal condition
    C.

     constantly the electrical quantities which differ during normal and abnormal conditions
    D.

     none of the above

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  10. A fuse is never inserted in

    11. A.

     neutral wire
    B.

     negative of D.C. circuit
    C.

     positive of D.C. circuit
    D.

     phase dine

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