Power Systems
Mechanical energy is supplied to a DC generator at the rate of 4200 J / S. The generator delivers 32.2 Amp at 120 V. How much energy is cost per minute of operation

  20160 J.
 23060 J.
 25060 J.
  20060 J.

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Power Systems
In hydroelectric power plants

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

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