Steam enters an adiabatic turbine steadily at 8 MPa, 500oC, 50 m/s, and exits at 30 kPa,

Question:

Steam enters an adiabatic turbine steadily at 8 MPa, 500oC, 50 m/s, and exits at 30 kPa, 150 m/s. The mass flow rate is 1 kg/s, the adiabatic efficiency is 90%, and the ambient temperature is 300 K. Determine
(a) The second-law efficiency of the turbine.
(b) What-if Scenario: What would the second law efficiency be if the adiabatic efficiency were 85%?