Power Systems
In hydroelectric power plants

  operating cost is low and initial cost is high.
 both operating and initial cost are high.
 both operating and initial cost are low.
 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 average run off during the period.
All of these
 the discharge at any time during the period under consideration.

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