Power Systems
Which of the following statements is/are true? Corona is reduced by

 increasing the radius of the conductor
 increasing the distance between the conductor
 decreasing the supply frequency
All of these

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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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