Power Systems
Gas coolled reactor

 use CO2. or helium as coolant and graphite the moderator.
 use heavy water as coolant as well as moderator.
  both B and C.
 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.

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Power Systems
The skin effect shows that

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

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