Power Systems
A string insulator has 4 units. The voltage across the bottom most unit is 33.33% of total voltage. Its string efficiency is

 25%
 33.33%
 66.66%
 75%

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Power Systems
Per unit of any quantity is defined as

 actual value of quantity /base value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in same units
 base value of quantity /actual value of quantity in different units

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