Question
The leakage resistance of a 50 km long cable is 1 MΩ. For a 100 km long cable, it will be _____.
The correct answer is
0.5 MΩ
Leakage resistance in a cable refers to the resistance offered by the insulating material to the flow of current from the conductor to the sheath or ground. Therefore, the leakage resistance of a cable is inversely proportional to its length. Therefore, the correct answer is 0.5 MΩ.
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Important Questions from Underground Cables
Which of the following is a leading power factor system?
Which of the following is NOT a disadvantage of the direct laying method?
Grading of the cables is performed in order to achieve _________
(i) uniform stress
(ii) reduction in the quantity of insulation
(iii) reduction in quality of insulation
- What is the minimum resistance required in insulation test voltage is 500 V DC accordance with BS 7671?
Murray, Varley and Fisher loop tests are used for
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