Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 lowering the value of K below 1 but later bringing it back to K = 1.
 lowering the value of K below and keeping at that lowered value.
  raising the value of K above 1, but later bringing it back to K = 1.
 raising the value of K above 1 and keeping it at raised value.

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Power Systems
The skin effect shows that

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

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