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Question

A string insulator has 5 units. The voltage across the bottom most unit is 25% of the total voltage. The string efficiency is 

A.

25% 

B.

50% 

C.

80%

D.

75%

Answer ( Option C)

80%

Solution

Given :

n = 5 units voltage at bottom unit = 25% V

Total phase voltage = V

String efficiency = ?

% String Efficiency

Hence, the correct option is (C).

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