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Entropy generation in any real process is

  • A.always positive, and zero in the reversible limit
  • B.always zero whenever the process is an adiabatic one
  • C.positive or negative depending on the direction taken
  • D.equal to the heat transferred divided by the temperature

Answer: A

It is the measure of irreversibility, and a negative value would mean a process that the second law forbids. Reversible processes are the idealised limiting case in which it vanishes. It is the quantity an exergy analysis ultimately prices.

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