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An adiabatic steam turbine operates with an inlet state of 4 MPa, 500 °C (h1 = 3446 kJ/kg, s1 = 7.090 kJ/kg·K) and an outlet pressure of 10 kPa. If the actual specific work output is 850 kJ/kg, what is the isentropic efficiency of the turbine? (At 10 kPa, h_f = 191.8 kJ/kg, h_fg = 2392.1 kJ/kg, s_f = 0.649 kJ/kg·K, s_fg = 7.501 kJ/kg·K).
Correct Answer:
70.8%

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