Power Systems
For variable heads of near about but less than 30 meters, which type of turbine is used in hydro power station?

None of these
 Kaplan
 Francis
 Pelton

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Power Systems
The skin effect shows that

 current density is more at the surface of the condutor
 current density is lower at the surface of the condutor
 current density is more at the centre of the condutor
 the distribution of AC current is uniform through the cross section of the conductor

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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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