Power Systems
Gas coolled reactor

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

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Power Systems
A sodium graphite reactors use

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

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Power Systems
In boiler water reactor (BWR)

 there is danger of radioactive contamination of steam.
 the feed water acts both coolant and a moderator.
 enriched uranium is used as fuel.
  all of above.

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