Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 100, 10
 100, 0.4
 4, 0.4
 4, 10

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Power Systems
In coal fired thermal power stations, what are the electrostatic precipitators used for?

 To collect the dust particles from the flue gases
 To remove dust particles setting on the bus bar conductors in the station switch yard
 To keep the air heaters clean
All of these

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