Power Systems
The economics of power plant is greatly influenced by

 both 1 and 2
 diversity factor
 load factor
 nether 1 nor 2

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Power Systems
Critical mass is

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

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