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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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the tail race is provided.
 all of above.
 the height of water level in the river where the storage is provided.
  the difference of water level between the level in storage and tail race.

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