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Power Systems

Power Systems
Ideal plant load cfactor is

 0
 less than 1
 greater than 1
 1

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Power Systems
The ratio of reset to pick up current for an induction cup relay is approximately

 0.75.
 1.35.
 1.0.
  0.99.

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 3.75 pu
 2.5 pu
 7.25 pu
 4.28 pu

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Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Air.
  Water.
  Liquid.
  Hydrogen.

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Power Systems
If power P available from a hydroelectric plant is given by the formula P = 9.81QH, where Q is the flow rate through the turbine in l / s and H is the head in meters, then P will be unit of

 HP.
 kJ / S.
  W.
 kWh.

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Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 20
 10
 13
 21

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