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POWER SYSTEMS

Power Systems
The main objectives of power system is/are

 Flexible power has to be available.
 Reliable power has to be available
 Cost of electrical energy per KWh is to be minimum
All of these

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Power Systems
If L and C are 4 mH and 0.0001 μF respectively a current chop of magnitude 50 Amp would induced a voltage

 400 kV.
  200 kV.
 50 kV.
  100 kV.

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Power Systems
If the percentage reactance of an element is 20 % and the full load current is 50 Amp, the short circuit current will be

 300 Amp.
 200 Amp.
  250 Amp.
 350 Amp.

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Power Systems
A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

  14 %.
  56 %.
  None of above
  28 %.

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Power Systems
In thermal power plants the size of coal after crushing

  20 - 25 mm.
  300 mm.
 200 - 205 mm.
 40 mm.

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