Power Systems
A sodium graphite reactors use

 a mixture of sodium and graphite as moderator.
  sodium as coolant and graphite as moderator.
 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as coolant.

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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 lower at the surface of the condutor
 current density is more at the surface of the condutor

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