Power Systems
In relay coil which is used?

  Power transformer.
  Potential transformer.
  Instrument transformer.
  Current transformer.

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Power Systems
Gross head of an hydroelectric power station is

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

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