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Power Systems

Power Systems
Rankine cycle efficiency of a steam power plant is of

  45 - 80 %.
  30 - 45 %.
  20 - 30 %.
  60 - 80 %.

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Power Systems
Advantages of pumped storage plants is/are

 most economical as a peak load supply plant
 used as load frequency control
 operating time is minimum
All of these

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Power Systems
A generator has a rating of 10 MVA, 5 kV has a reactance of 0.02 pu. Find the reactance at a new base values of 50 MVA, 10 kV?

 0.025
 0.05
 0.25
 0.02

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Power Systems
A 100 Km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 VA the resistance of the line is

  8.06 Ω / phase.
 2.26 Ω / phase.
 4.65 Ω / phase.
 6.06 Ω / phase.

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.6 and 1.2 pu
 0.6, 0.8 and 1.2 pu
 0.8, 0.8 and 0.8 pu
 0.6, 0.6 and 0.6 pu

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Power Systems
The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

 A resistance of 100 ohm.
 A resistance of j300 ohm.
 A resistance of 100/3 ohm.
 A resistance of j100/3 ohm.

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