Power Systems
In hydroelectric power plants

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

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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.
 the average run off during the period.
All of these

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