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Switchgear Protections - section-1
  1. A.C. network analyzer is used to solve problems of

    2. A.

     Load flow
    B.

     Load flow and short-circuit
    C.

     Load flow and stability
    D.

     Load flow, short-circuit and stability

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  2. Interruption of large currents by relay requires

    3. A.

     arc suppressing blow out coils
    B.

     wide separation of the opened contacts
    C.

     high speed opening of contacts
    D.

     all of the above

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  3. In Railway applications ______ circuit breaker is used.

    4. A.

     SFe
    B.

     bulk oil
    C.

     minimum oil
    D.

     air break

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  4. A short-circuit is identified by

    5. A.

     no current flow
    B.

     heavy current flow
    C.

     voltage drop
    D.

     voltage rise

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  5. The fuse wire, in D.C. circuits, is inserted in

    6. A.

     negative circuit only
    B.

     positive circuit only
    C.

     both (A) and (B)
    D.

     either (A) or (B)

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  6. The fuse rating is expressed in terms of

    7. A.

     current
    B.

     voltage
    C.

     VAR
    D.

     kVA

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