Power Systems
Which cooling is preferred for large turbine generator

  Oxygen cooling.
  Nitrogen cooling.
  None of these.
  Hydrogen cooling.

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Power Systems
Critical mass is

  minimum mass of fissionable material required to sustain chain reaction.
 maximum mass of fissionable material required to sustain a chain reaction.
 none of these.
 a mass of fissionable material required to stop a chain reaction.

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Power Systems
A sodium graphite reactors use

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

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