Discussion
A process for which the entropy generation is calculated to be negative indicates
Answer: D
Correct answer: an error in the calculation or an impossible case
Entropy generation cannot be negative - that is the second law in its most usable form, \( S_{gen} \ge 0 \). A negative result therefore signals a mistake: a wrong sign on a heat term, a temperature in Celsius where absolute was needed, or a set of specified inlet and outlet conditions that no real device could achieve. It is one of the most useful checks available on a process calculation.
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