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Power Systems

Power Systems
Which of the following relationships are not valid for short transmission lines

 B = C = Z
 Is = Ir
 A = D = 1
All of these

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Power Systems
Among the following which is not non conventional energy

  Wind.
  Geothermal.
  Tidal.
  Nuclear.

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Power Systems
The function of draft tube is reaction turbine is to

 increase flow rate of water.
 all of above.
  convert kinetic energy of water.
 reduce water hammer.

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Power Systems
A power station plant load factor is defined as the ratio of

 minimum load to average load
 minimum load to peak load
 average load to the peak load
 the energy generated to that of maximum energy that could have been generated

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Power Systems
What is the approximate efficiency of a normal thermal power station?

 45-55%
 20-25%
 60-70%
 30-40%

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 5 pu
 3.535 pu
 7 pu
 5.353 pu

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