Power Systems
A sodium graphite reactors use

 a mixture of sodium and graphite as moderator.
 a mixture of sodium and graphite as coolant.
  sodium as coolant and graphite as moderator.
 sodium as moderator and graphite as coolant.

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

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

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