Power Systems
The conductor carries more current on surface as compared to core. This is called as

 skin effect
 corona effect
 unsymmetrical fault
All of these

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

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

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