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EEE :: Transmission and Distribution

  1. The use of strain type insulators is made where the conductors are

  2. A.

     Dead ended

    B.

     At intermediate anchor towers

    C.

     Any of the above

    D.

     None of the above


  3. As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only

  4. A.

     31.25 percent of copper

    B.

     33.3 percent of copper

    C.

     66.7 percent of copper

    D.

     125 percent of copper


  5. A circuit is disconnected by isolators when

  6. A.

     Line is energized

    B.

     There is no current in the line

    C.

     Line is on full load

    D.

     Circuit breaker is not open


  7. Large industrial consumers are supplied electrical energy at

  8. A.

     400 V

    B.

     11 kV

    C.

     66 kV

    D.

     400 kV


  9. In a substation the following equipment is not installed

  10. A.

     Exciters

    B.

     Series capacitors

    C.

     Shunt reactors

    D.

     Voltaire transformers


  11. The distributors for residential areas are

  12. A.

     Single phase

    B.

     Three-phase three wire

    C.

     Three-phase four wire

    D.

     None of the above


  13. The material commonly used for insulation in high voltage cables is

  14. A.

     Lead

    B.

     Paper

    C.

     Rubber

    D.

     None of the above


  15. The material generally used for armour of high voltage cables is

  16. A.

     Aluminium

    B.

     Steel

    C.

     Brass

    D.

     Copper


  17. Which of the following bus-bar schemes has the lowest cost?

  18. A.

     Ring bus-bar scheme

    B.

     Single bus-bar scheme

    C.

     Breaker and a half scheme

    D.

     Main and transfer scheme


  19. jCorona usually occurs when the electrostatic stress in air around the conductor exceeds

  20. A.

     6.6 kV (r.m.s. value)/cm

    B.

     11 kV (r.m.s. value)/cm

    C.

     22 kV (maximum value)/cm

    D.

     30 kV (maximum value)/cm