Electrical Cables Question with Answer

11. High tension cables are generally used upto

  1. 11kV
  2. 33kV
  3. 66 kV
  4. 132 kV

12. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be

  1. 5 kV/mm
  2. 10 kV/mm
  3. 15 kV/mm
  4. 30 kV/mm

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

  1. 2 cm
  2. 10 cm
  3. 50 cm
  4. 400 cm

14. If the length of a cable is doubled, its capacitance

  1. becomes one-fourth
  2. becomes one-half
  3. becomes double
  4. remains unchanged

15. In a cable immediately above metallic sheath.............is provided.

  1. earthing connection
  2. bedding
  3. armouring
  4. none of the above

16. In a cable the voltage stress is maximum at

  1. sheath
  2. insulator
  3. surface of the conductor
  4. core of the conductor

17. In a cable, the maximum stress under operating conditions is at

  1. insulation layer
  2. sheath
  3. armour
  4. conductor surface

18. In cables the charging current

  1. lags the voltage by 90°
  2. leads the voltage by 90°
  3. lags the voltage by 180°
  4. leads the voltage by 180°

19. In capacitance grading of cables we use a....................dielectric

  1. composite
  2. porous
  3. homogeneous
  4. hygroscopic

20. In case of three core flexible cable the colour of the neutral is

  1. blue
  2. black
  3. brown
  4. none of the above

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