Power Systems
Which of the following relays are used in protection of medium transmission lines?

 Admittance relays
 Mho relays
 Impedance relays
 any of the above

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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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