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 coolant and graphite as moderator.
 sodium as moderator and graphite as coolant.

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Power Systems
The power level of nuclear reactor can be increase by ( K = multiplication factor )

 lowering the value of K below 1 but later bringing it back to K = 1.
 raising the value of K above 1 and keeping it at raised value.
 lowering the value of K below and keeping at that lowered value.
  raising the value of K above 1, but later bringing it back to K = 1.

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Power Systems
An hydro-graph indicates

 the average run off during the period.
 the discharge at any time during the period under consideration.
 the maximum and minimum run off during the period.
All of these

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