Power Systems
In nuclear chain fission reaction each neutron causing fission produces

 one new neutron.
 no new neutron.
 less than one new neutron.
  at least one new neutron.

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Power Systems
A sodium graphite reactors use

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

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