Saturated steam enters a steady-state adiabatic turbine at T = 523.15 K. The outlet pressure of the turbine is 0.1 MPa. The efficiency of the turbine is 73%. What is the quality of the VLE mixture leaving the turbine?
A. 0.788
B. 0.857
C. 0.750
D. 0.701
E. Insufficient information to answer.
A. Incorrect. This is the quality for a reversible turbine operating at these conditions. The problem statement indicates the efficiency isn’t 100%; the turbine isn’t reversible.
B. Correct. Following Examples 4-7 and 4-8 produces the correct answer.
C. Incorrect. You probably made a mistake in your final calculation for real (not reversible) quality.
D. Incorrect. This might be because you calculated the reversible quality incorrectly and used it as an answer. Check your derivations.
E. Incorrect. There is enough information provided. Review the chapter, especially Section 4.4.2 for ideas if you don’t “see the path” from problem statement to answer.
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