Power Systems
In which power plant, the thermal efficiency is quite low

  Steam power plant.
  Diesel power plant.
  Nuclear power plant.
  Hydro power plant.

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Power Systems
Critical mass is

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

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