Underground Cable Multiple Choice Questions and Answers

36.  Underground cables are laid at sufficient depth so as to

   A. Minimise temperature stresses

   B. Minimise effects of shocks and vibrations owing to passing vehicles etc.

   C. Avoid being unearthed easily owing to removal of soil

   D. Both A and C

37.  in underground cables the electrostatic stress is

   A. Maximum at contactor surface and minimum at the sheath

   B. Minimum at contactor surface and maximum at the sheath

   C. Same at the conductor and sheath

   D. Zerothe contactor as well as on the sheath

38.  The materials used for armouring of an underground cable is

   A. Galvanised steel wire

   B. Steel tape

   C. Aluminium

   D. Either A or B

39.  Metallic shielding is provided on underground cables to

   A. Reduce thermal resistance

   B. Reduce corona effect

   C. Control the electrostatic voltage stress

   D. All of the above

   E.None of the above

40.  The underground system is ...........costly then the equivalent overhead line system

   A. More

   B. Less

   C. Same

   D. Greater than

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