Power Systems
Which of following generating plants has the minimum operating cost

 Nuclear plant.
 Steam plant.
 Hydroelectric plant.
 Diesel plant.

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

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