High pressure steam is expanded adiabati-cally and reversibly through a well ins

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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:

Options:

A . Δ H = 0 and ΔS = 0

B . Δ H ≠ 0 and ΔS = 0

C . Δ H ≠ 0 and ΔS ≠ 0

D . Δ H = 0 and ΔS ≠ 0

Answer: Option B

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