Power Systems
The power output from an hydroelectric plants depend on

 type of dam, head, system efficiency.
 type of turbine, type of dam and type of catchment area.
 type of dam, type of catchment area and discharge.
  discharge, system efficiency.

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

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