Power Systems
Corona is accompanied by

 power loss and interference
All of these
 violet visible light
 hissing sound

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

 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
 the initial cost of hydro electric power station is low
 the operation cost of hydro electric power station is low

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