Power Systems
The function of moderator in a nuclear reactor is to

 reduce temperature.
  reduce the speed of neutrons.
  stop chain reaction.
 absorb neutrons.

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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
All of these
 To collect the dust particles from the flue gases
 To keep the air heaters clean

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