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For an existing ac transmission line, the string efficiency is 80%, if dc voltage is supplied for the same set up, the string efficiency will be ______%
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- 70
- 80
- 90
- 100
Correct Option: D
Since there are no currents flowing in any part of the insulator circuit (assuming infinite leakage resistance), the voltage across each of the equal capacitance units is equal, i.e. uniform voltage distribution exists, the string efficiency becomes 100%.
