Steam enters a steady state turbine at T = 573.15 K and P = 0.5 MPa. It leaves the turbine as a VLE mixture at P = 10 kPa, and the quality of the mixture is 0.99. How much work is produced by the turbine, per kilogram of entering steam?

A. -504. kJ/kg
B. -551. kJ/kg
C. 512. kJ/kg
D. -908. kJ/kg
E. Insufficient information to solve


A. Correct. Simplifying the energy balance and reading the correct steam tables returns this answer.
B. Incorrect. You are misreading the steam table.
C. Incorrect. You have made an algebra error because your sign is incorrect. Energy leaving the system as shaftwork is negative because it is energy the system is losing.
D. Incorrect. You have reversed the definition of quality in your calculations.
E. Incorrect. The inlet and outlet streams are fully specified and the process is described.
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