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EEE :: Transmission and Distribution

  1. Due to which of the following reasons the cables should not be operated too hot?

  2. A.

     The oil may loose its viscosity and it may start drawing off from higher levels

    B.

     Expansion of the oil may cause the sheath to burst

    C.

     Unequal expansion may create voids in the insulation which will lead to ionization

    D.

     All of the above


  3. When an alternator connected to the bus-bar is shut down the bus-bar voltage will

  4. A.

     Fall

    B.

     Rise

    C.

     Remain unchanged

    D.

     None of the above


  5. Multi-core cables generally use

  6. A.

     Square conductors

    B.

     Circular conductors

    C.

     Rectangular conductors

    D.

     None of the above


  7. The corona is considerably affected by which of the following?

  8. A.

     Size of the conductor

    B.

     Shape of the conductor

    C.

     Surface condition of the conductor

    D.

     All of the above


  9. Transmission voltage of ll kV is normally used for distances upto

  10. A.

     20 - 25 km

    B.

     40 - 50 km

    C.

     60 - 70 km

    D.

     80 - 100 km


  11. The phenomenon of rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the

  12. A.

     See-back effect

    B.

     Ferranti effect

    C.

     Raman effect

    D.

     None of the above


  13. Series capacitors on transmission lines are of little use when the load VAR requirement is

  14. A.

     Large

    B.

     Small

    C.

     Fluctuating

    D.

     Any of the above


  15. The voltage of the single phase supply to residential consumers is

  16. A.

     110 V

    B.

     210 V

    C.

     230 V

    D.

     400 V


  17. The wooden poles well impregnated with creosite oil or any preservative compound have life

  18. A.

     from 2 to 5 years

    B.

     10 to 15 years

    C.

     25 to 30 years

    D.

     60 to 70 years


  19. The conductors of the overhead lines are

  20. A.

     solid

    B.

     stranded

    C.

     both solid and stranded

    D.

     none of the above