Home / EEE / Switchgear Protections :: section-1

EEE :: Switchgear Protections

  1. The torque produced in induction type relay (shaded pole structure) is

  2. A.

     inversely proportional to the current

    B.

     inversely proportional to the square of the current

    C.

     proportional to the current

    D.

     proportional to square of the current

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?

  4. A.

     Zero

    B.

     Unity

    C.

     Infinity

    D.

     None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. Burden of a protective relay is the power

  6. A.

     required to operate the circuit breaker

    B.

     absorbed by the circuit of relay

    C.

     developed by the relay circuit

    D.

     none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. The line insulation is the insulation level of the station equipment.

  8. A.

     less than

    B.

     same as

    C.

     more than

    D.

     proportional to

    E.

     not directly related with

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. A balanced 3-phase system consists of

  10. A.

     zero sequence currents only

    B.

     positive sequence currents only

    C.

     negative and zero sequence currents

    D.

     zero, negative and positive sequence currents

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The delay fuses are used for the protection of ________ .

  12. A.

     motors

    B.

     power outlet circuits

    C.

     fluorescent lamps

    D.

     light circuits

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Ungrounded neutral transmission system is not recommended because of system

  14. A.

     insulation being overstressed due to over voltages

    B.

     insulation overstress may lead to failure and subsequent phase to phase faults

    C.

     being inadequately protected against ground fault

    D.

     all of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. Induction cup relay is operated due to changes in

  16. A.

     current

    B.

     voltage

    C.

     impedance

    D.

     all of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. Which of the following parameter can be neglected for a short line?

  18. A.

     Inductance

    B.

     Capacitance

    C.

     Resistance

    D.

     Reactance

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Shunt capacitance is neglected while considering

  20. A.

     short transmission line

    B.

     medium transmission line

    C.

     long transmission line

    D.

     medium and long transmission lines

    View Answer

    Workspace

    Discuss Discuss in Forum