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
All of these
 To keep the air heaters clean

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Power Systems
In hydroelectric power plants

 operating cost is high and initial cost is low.
 both operating and initial cost are low.
 both operating and initial cost are high.
  operating cost is low and initial cost is high.

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