Discussion
Consider the following statements about a real adiabatic turbine.
1. Its exit entropy is higher than its inlet entropy.
2. Its work output is less than the isentropic value.
3. Its exit temperature is lower than the isentropic exit temperature.
Answer: B
The first two are correct and follow from irreversibility. The third is inverted: less work extracted means more energy left in the stream, so the real exit temperature is higher. That extra enthalpy is the work that was never extracted.
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