Home / EEE / Switchgear Protections :: section-1

EEE :: Switchgear Protections

  1. The power loss is an important factor for the design of

  2. A.

     transmission line

    B.

     motor

    C.

     generator

    D.

     feeder


  3. The single phasing relays are used for the protection of

  4. A.

     single phase motors only

    B.

     two phase motors only

    C.

     two single phase motors running in parallel

    D.

     three phase motors


  5. The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to

  6. A.

     lubricate the contacts

    B.

     insulate the contacts from switch body

    C.

     extinguish the arc

    D.

     all of the above

    E.

     none of the above


  7. To limit short-circuit current in a power system are used

  8. A.

     earth wires

    B.

     isolators

    C.

     H.R. fuses

    D.

     reactors


  9. Series capacitors are used to

  10. A.

     compensate for line inductive reactance

    B.

     compensate for line capacitive reactance

    C.

     improve line voltage

    D.

     none of the above


  11. In a single bus-bar system there will be complete shut down when

  12. A.

     fault occurs on the bus itself

    B.

     fault occurs on neutral line

    C.

     two or more faults occur simultaneously

    D.

     fault occurs with respect to earthing


  13. A differential relay measures the vector difference between

  14. A.

     two currents

    B.

     two voltages

    C.

     two or more similar electrical quantities

    D.

     none of the above


  15. A switchgear is device used for

  16. A.

     interrupting an electrical circuit

    B.

     switching an electrical circuit 111

    C.

     switching and controlling an electrical circuit

    D.

     switching, controlling and protecting the electrical circuit and equipment


  17. With which of the following, a circuit breaker must be equipped for remote operation ?

  18. A.

     Inverse time trip

    B.

     Time-delay trip

    C.

     Shunt trip

    D.

     None of the above

    E.

     All of the above


  19. A _______ is used to measure the stator % winding temperature of the generator.

  20. A.

     thermocouple

    B.

     pyrometer

    C.

     resistance thermometer

    D.

     thermometer