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EEE :: Switchgear Protections

Switchgear Protections - section-1
  1. Arc in a circuit behaves as

    2. A.

     a capackive reactance
    B.

     an inductive reactance
    C.

     a resistance increasing with voltage rise across the arc
    D.

     a resistance decreasing with voltage rise across the arc

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  2. A fuse is connected

    3. A.

     in series with circuit
    B.

     in parallel with circuit
    C.

     either in series or in parallel with circuit
    D.

     none of the above

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  3. The reflection co-efficient at the open circuited end of a transmission line.

    4. A.

     zero
    B.

     infinity
    C.

     unity
    D.

     none of the above

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  4. Protection by fuses is generally not used beyond

    5. A.

     20 A
    B.

     50 A
    C.

     100 A
    D.

     200 A

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  5. The ground wire should not be smaller than No ______ copper.

    6. A.

     2
    B.

     4
    C.

     6
    D.

     10

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  6. Directional relays are based on flow of

    7. A.

     power
    B.

     current
    C.

     voltage wave
    D.

     all of the above

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  7. Admittance relay is _______ relay.

    8. A.

     impedance
    B.

     directional
    C.

     non-directional
    D.

     none of the above

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  8. The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

    9. A.

     recovery
    B.

     surge
    C.

     operating
    D.

     arc
    E.

     none of the above

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  9. The material used for fuse must have

    10. A.

     low melting point and high specific resistance
    B.

     low melting point and -low specific resistance
    C.

     high melting point and low specific resistance
    D.

     low melting point and any specific resistance

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  10. For cost and safety, the outdoor substations are installed for voltages above

    11. A.

     11 kV
    B.

     33 kV
    C.

     60 kV
    D.

     110 kV

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