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Cables - Interview Questions and Answers

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26. The breakdown of insulation of the cable can be avoided economically by the use of
A. inter-sheaths
B. insulating materials with different dielectric constants
C. both (a) and (b)
D. none of the above
Explanation:
27. If the length of a cable is doubled, its capacitance
A. becomes one-fourth
B. becomes one-half
C. becomes double
D. remains unchanged
Explanation:
28. Cables for 220 kV lines are invariably
A. mica insulated
B. paper insulated
C. compressed oil or compressed gas insulated
D. rubber insulated
Explanation:
29. A cable carrying alternating current has
A. hysteresis losses only
B. hysteresis and leakage losses only
C. hysteresis, leakage and copper losses only
D. hysteresis, leakage, copper and friction losses
Explanation:
30. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become
A. one half
B. double
C. four times
D. none of the above
Explanation:
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