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EEE :: Transmission and Distribution

  1. For an overhead line, the surge impedance is taken as

  2. A.

     20-30 ohms

    B.

     70-80 ohms

    C.

     100-200 ohms

    D.

     500-1000 ohms

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  3. Which of the following distribution systems is more reliable?

  4. A.

     Radial system

    B.

     Tree system

    C.

     Ring main system

    D.

     All are equally reliable

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  5. Most of the high voltage transmission lines in India are

  6. A.

     Underground

    B.

     Overhead

    C.

     Either of the above

    D.

     None of the above

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  7. There is a greater possibility of occurrence of corona during

  8. A.

     Dry weather

    B.

     Winter

    C.

     Summer heat

    D.

     Humid weather

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  9. By which of the following methods string efficiency can be improved?

  10. A.

     Using a guard ring

    B.

     Grading the insulator

    C.

     Using long cross arm

    D.

     Any of the above

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  11. The material commonly used for sheaths of underground cables is

  12. A.

     Lead

    B.

     Rubber

    C.

     Copper

    D.

     Iron

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  13. For which of the following equipment current rating is not necessary?

  14. A.

     Circuit breakers

    B.

     Isolators

    C.

     Load break switch

    D.

     Circuit breakers and load break switches

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  15. The voltage drop, for constant voltage transmission is compensated by installing

  16. A.

     Inductors

    B.

     Capacitors

    C.

     Synchronous motors

    D.

     All of above

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  17. The operating voltage of extra high tension cables is upto

  18. A.

     6.6 kV

    B.

     11 kV

    C.

     33 kV

    D.

     66 kV

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  19. When a conductor carries more current on the surface as compared to core, it is due to

  20. A.

     Permeability variation

    B.

     Corona

    C.

     Skin effect

    D.

     Unsymmetrical fault

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