Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

 2Zs/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)
 2Zl/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)

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Power Systems
Critical mass is

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

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