Power Systems
An hydro-graph indicates

 the average run off during the period.
 the maximum and minimum run off during the period.
All of these
 the discharge at any time during the period under consideration.

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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
 To collect the dust particles from the flue gases
All of these

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