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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Power Systems
In order to have lower cost of power generaion

 The load factor and diversity factor should be high
 the load factor and diversity factor should be low
 the load factor should be low but diversity factor should be high
 the load factor should be high but diversity factor should be low

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