A suspension type insulator has three units with self-capacitance C and ground capacitance of

A suspension type insulator has three units with self-capacitance C and ground capacitance of 0.2 C having a string efficiency of 

 (a) 80% (b) 82% (c)78% (d) 76% 
by

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Answer :

A suspension type insulator has three units with self-capacitance C and ground capacitance of 0.2 C having a string efficiency of 78%

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