Power Systems
A thermal power station needs space

 less than that required by a gas turbine power plant of same output.
 less than that required by the diesel power station of same output.
  less than that required by hydro-power station of same capacity.
 less than that required by atomic power station of the same output.

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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 tail race 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 storage is provided.

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