Power Systems
In which power plant, the thermal efficiency is quite low

  Steam power plant.
  Hydro power plant.
  Diesel power plant.
  Nuclear power plant.

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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.
 all of above.
  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.

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