High pressure steam is expanded adiabati-cally and reversibly through a well insulated turbine, which produces some shaft work. If the enthalpy change and entropy change across the turbine are represented by ΔH and ΔS respectively for this process:
A. ΔH = 0 and ΔS = 0
B. ΔH ≠ 0 and ΔS = 0
C. ΔH ≠ 0 and ΔS ≠ 0
D. ΔH = 0 and ΔS ≠ 0
Answer: Option B
Solution (By Examveda Team)
For a reversible adiabatic process the entropy change is zero since $$dS = \frac{{\delta Q}}{T}$$But the enthalpy change need not be zero since the internal energy and pressure energy may vary during the process.
This Question Belongs to Chemical Engineering >> Chemical Engineering Thermodynamics
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