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Power Systems

Power Systems
Corona loss is ----------------- on hilly areas than as plain areas.

 less
 remain same
None of these
 more

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Power Systems
The sequence components of the fault current are as follows : Ipositive = j1.5 pu, Inegative = − j0.5 pu, Izero = − j pu Which fault is this?

  LL.
  LLG.
  LLLG.
  LG.

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

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

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Power Systems
In which power plant, the thermal efficiency is quite low

  Hydro power plant.
  Nuclear power plant.
  Diesel power plant.
  Steam power plant.

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Power Systems
A coal fired steam power station working at a plant factor of 80% has one 500 MW generating unit. If the heat content of coal is 2 kWh/kg, the overall plant efficiency is 40% and a train load of coal is 2000 metric tons, then the number of trains required daily for the plant is

 2
 16
 10
 6

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Power Systems
If we increase the spacing between the phase conductors, the value of line inductance

 increase
None of these
 remains unaffected
 decrease

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