Power Systems
In hydroelectric power plants

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

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Power Systems
An hydro-graph indicates

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

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