Power Systems
Critical mass is

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

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Power Systems
ACSR means

 all conductor steel reinforced
 Aluminium conductor steel reinforced
 Aluminium copper steel reinforced
 Aluminium core steel reinforced

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