Power Systems
In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using

 HP steam.
  flue gas.
 direct heat in the furnace.
 LP steam.

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Power Systems
Gross head of an hydroelectric power station is

 all of above.
 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.
  the difference of water level between the level in storage and tail race.

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