Steam enters an adiabatic turbine at 8 MPa and 500°C at a rate of 18 kg/s, and exits at 0.2 MPa and 300°C. The rate of entropy generation in the turbine is (a) 0 kW/K (b) 7.2 kW/K (c) 21 kW/K (d) 15 kW/K (e) 17 kW/K

Steam enters a turbine with a mass flow rate of 15 kg/s at 500°C and 8 MPa. 30% of the steam is removed in the middle of the turbine where the steam is at saturated vapor state at 300 kPa. The remainder of the steam leaves turbine exit at 10 kPa and quality of 10 percent. If the turbine is adiabatic, what is the power generated by this turbine?

Steam enters an adiabatic turbine at 5 MPa and 500°C with a 50 m/s velocity and exits from the turbine at 100 kPa and 75 m/s velocity. The power output of the turbine is 5 MW and the isentropic efficiency is 80%. Determine, a) The mass flow rate of the steam passed through the turbine. b) The temperature at the turbine exit. c) The rate of entropy generation during this process.

A vessel initially contains 5.0 kg of liquid water and 2.0 kg of ice at 0°C. Energy is added until the ice has just melted. The temperature at the boundary where heat transfer occurs is taken to be the system temperature during the process. The enthalpy of melting is 333.5 kJ/kg. Consider the following processes used to melt the ice. a. Heat is added from the environment at 20°C. Determine the entropy flux and the total entropy generation, both in kJ/K. b. Heat is added from a reservoir at 727°C. Determine the same quantities as in part (a). c. Paddle-wheel work is used to change the state. Determine the total entropy production for the process, in kJ/K. d. Comment on the relative degree of irreversibility for the three processes.