Power Systems
The commercial sources of energy are

  fossile fuels and radioactive substances.
 wood, animal wastes and agricultural wastes.
 solar, wind, biomass.
 none of above.

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

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

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