Power Systems
When a pumped storage power plant is operated in conjunction with a steam power plant

All of these
 chances of the tripping of the system decrease
 load factor of the steam plant is increased
 the operating cost of the steam plant become optimum

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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 hydroelectric power plants

 both operating and initial cost are high.
 both operating and initial cost are low.
  operating cost is low and initial cost is high.
 operating cost is high and initial cost is low.

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