Power Systems
When a nuclear reaction is operating at constant power the multiplication factor is

  1.
 greater than 1.
 may be any of the above.
 less than 1.

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Power Systems
Critical mass is

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

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