Cables - Interview Questions and Answers

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36. Solid type cables are considered unreliable beyond 66 kV because
A. insulation may melt due to higher temperature
B. skin effect dominates on the conduc�tor
C. of corona loss between conductor and sheath material
D. there is a danger of breakdown of insulation due to the presence of voids
Explanation:
37. In a cable the voltage stress is maximum at
A. sheath
B. insulator
C. surface of the conductor
D. core of the conductor
Explanation:
38. The electrostatic stress in underground cables is
A. same at the conductor and the sheath
B. minimum at the conductor and maximum at the sheath
C. maximum at the conductor and minimum at the sheath
D. zero at the conductor as well as on the sheath
Explanation:
39. The intersheaths in the cables are used to
A. minimize the stress
B. avoid the requirement of good insulation
C. provide proper stress distribution
D. none of the above
Explanation:
40. Copper as conductor for cables is used as
A. annealed
B. hardened and tempered
C. hard drawn
D. alloy with chromium
Explanation: