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

 66.66%
 33.33%
 25%
 75%

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Power Systems
The advantage of hydro electric power station over thermal power station is

 the operation cost of hydro electric power station is low
 hydro electric station can be constructed at the place where the energy is required
 the initial cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year

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