Power Systems
The main objectives of electrical power transmission is/are

 Voltage regulation of the transmission line must be zero or minimum
 both 1 and 2
 nether 1 nor 2
 Transmission system must be more efficient with minimum line losses

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Power Systems
Critical mass is

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

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