Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 3.535 pu
 7 pu
 5 pu
 5.353 pu

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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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