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Cables - Interview Questions and Answers

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16. The breakdown voltage of a cable depends on
A. presence of moisture
B. working temperature
C. time of application of the voltage
D. all of the above
Explanation:
17. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ?
A. Polyvinyle chloride
B. Vulcanised rubber
C. Impregnated paper
D. Compressed SFe gas
Explanation:
18. In cables the charging current
A. lags the voltage by 90�
B. leads the voltage by 90�
C. lags the voltage by 180�
D. leads the voltage by 180�
Explanation:
19. The thickness of metallic shielding on cables is usually
A. 0.04 mm
B. 0.2 to 0.4 mm
C. 3 to 5 mm
D. 40 to 60 mm
Explanation:
20. Underground cables are laid at sufficient depth
A. to minimise temperature stresses
B. to avoid being unearthed easily due to removal of soil
C. to minimise the effect of shocks and vibrations due to gassing vehicles, etc.
D. for all of the above reasons
Explanation:
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