Power Systems
Critical disruptive voltage is a voltage at which

 nether 1 nor 2
 corona is visible with blue or violet colour
 corona is just initiated
 both 1 and 2

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

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

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