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Power Systems

Power Systems
Condition for maximum voltage regulation

 cosφ = R/X
 tanφ = X/R
 cosφ = X/R
 tanφ = R/X

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Power Systems
Lightning arresters are used to protect electrical equipment against

 power frequency of over voltages.
 direct strokes of lightning.
 over currents due to lightning stroke.
  over voltages due to indirect lightning stroke.

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Power Systems
Which of the following buses is/are not PV buses?

 reactive power support buses
 both 1 and 2
 voltage control buses
 fixed shunt capacitor buses

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Power Systems
The area under a flow duration curve represents

 total power available.
  total quantity of run-off during that period.
 total of units of energy available.
 maximum rate of run-off during the period.

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Power Systems
To improve the efficiency of thermal power plant ________________ is placed between boiler and turbine.

  superheater.
  ash handling point.
  air preheater.
  economizer.

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Power Systems
A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand?

 1 cm
 1.5 cm
 15 cm
 5 cm

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