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Question

The string efficiency of a string insulator with bottom unit having a 40% of the total voltage is 62.5%. The number of units in the string insulator is _____

  1. 4

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Solution

The correct option is A 4

η=voltageacrossthestringn×voltageacrossthe bottomunit

62.5100=Vn×(0.4V)

n=4 units


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