9.16 Steam at a pressure of 2 106 N/m and a temperature of 250 C flows steadily nto a turbine with negligible velocity. The steam leaves the turbine at a pressure of 15 10 N/m with a velocity of 200 m/s. The heat-transfer rate from the turbine casing to the atmosphere is 160 10 W. The power developed by the turbine is 3430 10 W. The mass flow rate is 6-1 kg/s. Determine the dryness of the steam leaving the turbine and the cross-sectional area of the exit section.