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Power Systems

Power Systems
Peak load power plants is/are

 pumped storage plant
 nuclear plants
 diesel plant
 both 1 and 2

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

 low steam turbine mechanical efficiency.
  high energy loss from turbine exhaust to condenser.
 low alternative efficiency.
 high energy loss in boiler.

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Power Systems
If we increase the spacing between the phase conductors, the line capacitance

None of these
 increases
 decreases
 remains unaffected

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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 %.
  None of above
  56 %.
  28 %.

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Power Systems
If a generator of 250 MVA rating has an inertia constant of 6 MJ/MVA, its inertia constant on 100 MVA base is

 15 MJ/MVA
 6 MJ/MVA
 2.5 MJ/MVA
 10.5 MJ/MVA

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Power Systems
Percentage of carbon is highest in

  coal gas.
  lignite coal.
  bituminous coal.
  anthracite coal.

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