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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Liquid.
  Water.
  Hydrogen.
  Air.

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Power Systems
String efficiency depends upon

 no. of SCR in the string.
 voltage rating of one SCR.
 voltage rating of whole string.
  all of these.

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Power Systems
A 60 Hz, 320 Km loss less line has sending end voltage 1.0 pu. The receiving end voltage on no-load is

  1.088 pu.
 1.116 pu.
 none of these.
 1.1 pu.

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xm - Xs
 2Xs + Xm
 Xs +2 Xm
 Xs - Xm

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Power Systems
The power station that does not requier any moving part is

 Solar power generation.
 Tidal power generation.
 Wind power generation.
  Thermonic convertor.

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.05 pu
 0.25 pu
 0.15 pu
 0.45 pu

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