Power Systems
Which of following are the fertile materials

 U238 and Pu239.
  U238 and Th232.
 U233 and Pu239.
 U238 and Th239.

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Power Systems
Gas coolled reactor

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

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