Discussion
Isentropic and adiabatic are not the same thing because
Answer: A
Correct answer: an adiabatic process can still generate entropy
Adiabatic means no heat crosses the boundary; isentropic means the entropy does not change. They coincide only when the process is also reversible, since \[ \Delta S = \int\frac{\delta Q}{T} + S_{gen}, \] and with \( Q=0 \) the entropy still rises by whatever is generated internally. A real turbine is very nearly adiabatic and distinctly not isentropic, which is precisely what its isentropic efficiency measures.
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