Home / EEE / Electrical Cables :: section-1

EEE :: Electrical Cables

  1. Pressure cables are generally not used beyond

  2. A.

     11 kV

    B.

     33 kV

    C.

     66 kV

    D.

     132 kV


  3. Solid type cables are considered unreliable beyond 66 kV because

  4. A.

     Insulation may melt due to higher temperature

    B.

     Skin effect dominates on the conductor

    C.

     Of corona loss between conductor and sheath material

    D.

     There is a danger of breakdown of insulation due to the presence of voids


  5. The insulation of the cable decreases with

  6. A.

     The increase in length of the insulation

    B.

     The decrease in the length of the insulation

    C.

     Either (A) or (B)

    D.

     None of the above


  7. The thickness of the layer of insulation on the conductor, in cables, depends upon

  8. A.

     Reactive power

    B.

     Power factor

    C.

     Voltage

    D.

     Current carrying capacity


  9. Polyethylene has very poor dielectric and ageing properties.

  10. A.

     Yes

    B.

     No


  11. The inters heaths in the cables are used to

  12. A.

     Minimize the stress

    B.

     Avoid the requirement of good insulation

    C.

     Provide proper stress distribution

    D.

     None of the above


  13. Conduit pipes are normally used to protect ________ cables.

  14. A.

     Unsheathed cables

    B.

     Armoured

    C.

     PVC sheathed cables

    D.

     All of the above


  15. _________ cables are used for 132 kV lines.

  16. A.

     High tension

    B.

     Super tension

    C.

     Extra high tension

    D.

     Extra super voltage


  17. Empire tape is

  18. A.

     Varnished cambric

    B.

     Vulcanized rubber

    C.

     Impregnated paper

    D.

     None of the above


  19. If a power cable and a communication cable are to run parallel the minimum distance between the two, to avoid interference, should be

  20. A.

     2 cm

    B.

     10 cm

    C.

     50 cm

    D.

     400 cm