Power Systems
A sodium graphite reactors use

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

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Power Systems
In Rankine cycle, the work output from a turbine is given by

  change in internal energy between inlet and outlet.
  change of entropy between inlet and outlet.
  change of enthalpy between inlet and outlet.
  change in temperature between inlet and outlet.

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