Power Systems
Which of the following is/are the desirable properties of a insulator material?

 High ratio of puncture strength to flash over.
 Both 1 and 2
 High relative permittivity
 Low ratio of puncture strength to flash over.

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Power Systems
In hydroelectric power plants

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

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