Power Systems
Critical mass is

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

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Power Systems
A thermal power station needs space

 less than that required by atomic power station of the same output.
 less than that required by the diesel power station of same output.
 less than that required by a gas turbine power plant of same output.
  less than that required by hydro-power station of same capacity.

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