Power Systems
A thermal power station needs space

  less than that required by hydro-power station of same capacity.
 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 atomic power station of the same output.

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Power Systems
The draft tube is provided to

None of these
 raise the water surface of the stream to create an artificial head.
  increase the acting head on the water wheel.
 reduce the effect of water hammer.

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