Power Systems
Objectives of power system is/are

 nether 1 nor 2
 both 1 and 2
 Rated voltage and frequency has to be supplied to the consumers
 Cost of electrical energy per KWh is to be minimum

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Power Systems
Critical mass is

 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.
  minimum mass of fissionable material required to sustain chain reaction.

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