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EEE :: Transmission and Distribution

  1. On which of the following factors skin effect depends?

  2. A.

     Frequency of the current

    B.

     Size of the conductor

    C.

     Resistivity of the conductor material

    D.

     All of the above


  3. Which of the following characteristics should the line supports for transmission lines possess?

  4. A.

     Low cost

    B.

     High mechanical strength

    C.

     Longer life

    D.

     All of the above


  5. A feeder, in a transmission system, feeds power to

  6. A.

     Distributors

    B.

     Generating stations

    C.

     Service mains

    D.

     All of the above


  7. Transmission line insulators are made of

  8. A.

     glass

    B.

     porcelain

    C.

     iron

    D.

     P.V.C.


  9. Skin effect is proportional to

  10. A.

     (conductor diameter)1/2

    B.

     (conductor diameter)4

    C.

     (conductor diameter)2

    D.

     (conductor diameter)3

    E.

     none of the above


  11. The operating voltage of high voltage cables is up to

  12. A.

     l.lkV

    B.

     3.3kV

    C.

     6.6kV

    D.

     llkV


  13. If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as

  14. A.

     Kelvin's law

    B.

     Ohm's law

    C.

     Kirchhoff's law

    D.

     Faraday's law


  15. Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system?

  16. A.

     Circulating current method

    B.

     Thevenin's theorem

    C.

     Superposition of currents

    D.

     All of the above


  17. Which of the following is the source of heat generation in the cables?

  18. A.

     Dielectric losses in cable insulation

    B.

     losses in the conductor

    C.

     Losses in the metallic sheathings and armourings

    D.

     All of the above


  19. Which of the following faults is most likely to occur in cables?

  20. A.

     Cross or short-circuit fault

    B.

     Open circuit fault

    C.

     Breakdown of cable insulation

    D.

     All of the above