Power Systems
The load current in short circuit calculations are neglected because

 nether 1 nor 2
 short circuit currents are greatly out of phase with load currents
 both 1 and 2
 short circuit currents are much larger than load currents

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Power Systems
A sodium graphite reactors use

  sodium as coolant and graphite as moderator.
 sodium as moderator and graphite as coolant.
 a mixture of sodium and graphite as coolant.
 a mixture of sodium and graphite as moderator.

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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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