Power Systems
In hydroelectric power plants

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

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Power Systems
An hydro-graph indicates

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

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