Power Systems
Deaerative heating is done to

  remove dissolved gases in water.
 heat the steam.
 remove dissolved.
 heat the feed water.

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Power Systems
Gross head of an hydroelectric power station is

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

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