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EEE :: Switchgear Protections

  1. Series reactors should have

  2. A.

     low resistance

    B.

     high resistance

    C.

     low impedance

    D.

     high impedance

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  3. Insulation resistance of high voltage circuit breakers is more than

  4. A.

     1 mega ohms

    B.

     10 mega ohms

    C.

     100 mega ohms

    D.

     500 mega ohms

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  5. An efficient and a well designed protective relaying should have

  6. A.

     good selectivity and reliability

    B.

     economy and simplicity

    C.

     high speed and selectivity

    D.

     all of the above

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  7. Distance relays are generally

  8. A.

     split-phase relays

    B.

     reactance relays

    C.

     impedance relays

    D.

     none of the above

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  9. For which of the following protection from negative sequence currents is provided ?

  10. A.

     Generators

    B.

     Motors

    C.

     Transmission line

    D.

     Transformers

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  11. To protect most of the electrical equipment handling low power, the types of relays used are

  12. A.

     Thermocouple

    B.

     Electronic and bimetallic

    C.

     Both (A) and (B)

    D.

     None of the above

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  13. A fuse in a motor circuit provides protection against

  14. A.

     overload

    B.

     short-circuit and overload

    C.

     open circuit, short-circuit and overload

    D.

     none of the above

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  15. Wave trap is used to trap waves of

  16. A.

     power frequencies

    B.

     higher frequencies entering generator or transformer units

    C.

     either of the above

    D.

     none of the above

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  17. SF6 gas

  18. A.

     is yellow in colour

    B.

     is lighter than air

    C.

     is nontoxic

    D.

     has pungent small

    E.

     none of the above

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  19. Air blast circuit breakers for 400 kV power system are designed to operate in

  20. A.

     100 microsecond

    B.

     50 millisecond

    C.

     0.5 sec

    D.

     0.1 sec

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