Power Systems
Load frequency control is achieved by properly matching the individual machines

  reactive powers.
  generator ratings.
  generated voltages.
  turbine inputs.

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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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