Home / EEE / Switchgear Protections :: section-1

EEE :: Switchgear Protections

  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

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. A fuse is connected

  4. A.

     in series with circuit

    B.

     in parallel with circuit

    C.

     either in series or in parallel with circuit

    D.

     none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


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

  6. A.

     zero

    B.

     infinity

    C.

     unity

    D.

     none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. Protection by fuses is generally not used beyond

  8. A.

     20 A

    B.

     50 A

    C.

     100 A

    D.

     200 A

    View Answer

    Workspace

    Discuss Discuss in Forum


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

  10. A.

     2

    B.

     4

    C.

     6

    D.

     10

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. Directional relays are based on flow of

  12. A.

     power

    B.

     current

    C.

     voltage wave

    D.

     all of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Admittance relay is _______ relay.

  14. A.

     impedance

    B.

     directional

    C.

     non-directional

    D.

     none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


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

  16. A.

     recovery

    B.

     surge

    C.

     operating

    D.

     arc

    E.

     none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. The material used for fuse must have

  18. 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

    View Answer

    Workspace

    Discuss Discuss in Forum


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

  20. A.

     11 kV

    B.

     33 kV

    C.

     60 kV

    D.

     110 kV

    View Answer

    Workspace

    Discuss Discuss in Forum