Power Systems
A thermal power station needs space

 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.
 less than that required by a gas turbine power plant of same output.

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Power Systems
An hydro-graph indicates

 the average run off during the period.
 the maximum and minimum run off during the period.
 the discharge at any time during the period under consideration.
All of these

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Power Systems
In hydroelectric power plants

 both operating and initial cost are high.
 operating cost is high and initial cost is low.
  operating cost is low and initial cost is high.
 both operating and initial cost are low.

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