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

 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
 the operation cost of hydro electric power station is low

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  operating coil current and restraining coil current.
  fault current and operating coil current.
  fault current and restraining coil current.
  number of turns of restraining and operating coil.

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