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Power Systems

Power Systems
Which turbine is ideally suited to pumped storage plants

 Impeller.
 Pelton.
 Francis.
  Kaplan.

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Power Systems
Which of the following represents the sag(S) of a transmission line?

 S = wl²/8T
 S = wl²/16T
 S = wl²/2T
 S = wl²/4T

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Power Systems
Skin effective is more in case of

 power lines
 same in both cases
 communication lines
None of these

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Power Systems
In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using

 LP steam.
  flue gas.
 direct heat in the furnace.
 HP steam.

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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 %.
  28 %.
  56 %.
  None of above

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Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 0.25 pu
 5 pu
 0.2 pu
 1 pu

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