Power Systems
Recovery voltage in CB is equal to

  arcing period voltage.
  none of these.
  normal frequency 50 Hz rms voltage.
  transient voltage.

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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 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

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