Power Systems
Which of following are the fertile materials

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

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Power Systems
A sodium graphite reactors use

  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as coolant.
 a mixture of sodium 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.
  all of above.
 enriched uranium is used as fuel.

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