Power Systems
The water from a catchment is 60*106 cu m annually and hydro station has head of 40 m. Assuming ideal generator and turbine, the power that can be theoretically generated is

 500 kW
 300 kW
 250 kW
 750 kW

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Power Systems
The skin effect shows that

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

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