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Cables - Interview Questions and Answers

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21. If a cable of homogeneous insulation has a maximum stress of 10 kV/mm, then the dielectric strength of insulation should be
A. 5 kV/mm
B. 10 kV/mm
C. 15 kV/mm
D. 30 kV/mm
Explanation:
22. The insulation of the cable decreases with
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
Explanation:
23. Which of the following insulation is used in cables ?
A. Varnished cambric
B. Rubber
C. Paper
D. Any of the above
Explanation:
24. The disadvantage with paper as insulating material is
A. it is hygroscopic
B. it has high capacitance
C. it is an organic material
D. none of the above
Explanation:
25. In the cables, sheaths are used to
A. prevent the moisture from entering the cable
B. provide enough strength
C. provide proper insulation
D. none of the above
Explanation:
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