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EEE :: Transmission and Distribution

  1. Owing to skin effect

  2. A.

     Current flows through the half cross-section of the conductor

    B.

     Portion of the conductor near the surface carries more current and core of the conductor carries less current

    C.

     Portion of the conductor near the surface carries less current and core of the conductor carries more current

    D.

     Any of the above

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  3. The spacing between phase conductors of a 220 kV line is approximately equal to

  4. A.

     2 m

    B.

     3.5 m

    C.

     6 m

    D.

     8.5 m

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  5. The skin effect of a conductor will reduce as the

  6. A.

     Resistivity of conductor material increases

    B.

     Permeability of conductor material increases

    C.

     Diameter increases

    D.

     Frequency increases

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  7. Which of the following is the demerit of a 'constant voltage transmission system'?

  8. A.

     Increase of short-circuit current of the system

    B.

     Availability of steady voltage at all loads at the line terminals

    C.

     Possibility of better protection for the line due to possible use of higher terminal reactants

    D.

     Improvement of power factor at times of moderate and heavy loads

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  9. Electromechanical voltage regulators are generally used in

  10. A.

     Reactors

    B.

     Generators

    C.

     Transformers

    D.

     All of the above

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  11. The presence of ozone due to corona is harmful because it

  12. A.

     Reduces power factor

    B.

     Corrodes the material

    C.

     Gives odour

    D.

     Transfer energy to the ground

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  13. The following system is not generally used

  14. A.

     1-phase 3-wire

    B.

     1-phase 4-wire

    C.

     3-phase 3-wire

    D.

     3-phase 4-wire

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  15. A conductor, due to sag between two supports, takes the form of

  16. A.

     Semicircle

    B.

     Triangle

    C.

     Ellipse

    D.

     Catenary

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  17. The cause of damage to the lead sheath of a cable is

  18. A.

     crystallisation of the lead through vibration

    B.

     chemical action on the lead when buried in the earth

    C.

     mechanical damage

    D.

     all of the above

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  19. The operating voltage of super-tension cables is up to

  20. A.

     3.3 kV

    B.

     6.6 kV

    C.

     11 kV

    D.

     33 kV

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