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Power Systems

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

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

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 3.975 pu
 1.375 pu
 0.2 pu
 2.4 pu

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Power Systems
With reference to hydrometer station, the graphical representation of the discharge as function of time is known as

 Monograph.
 Load duration curve.
  Hydro-graph.
 Hectograph.

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

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

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

  leading.
 lagging.
 zero.
 unity.

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Power Systems
Fault calculations using computer are usually done by

None of these
 Y bus method
 Z bus method
 either 1 or 2

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