Power Systems
Earth fault relay uses the which of the following sequence currents?

 negative sequence
 any of the above
 zero sequence
 positive sequence

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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the tail race is provided.
 the height of water level in the river where the storage is provided.
  the difference of water level between the level in storage and tail race.
 all of above.

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