Steam at 800 kPa, 350°C flows through a convergent-divergent nozzle that has a throat area of350 mm2. The pressure at the exit plane is 150 kPa and the exit velocity is 800 m/s. The flow from the nozzle entrance to the throat is reversible and adiabatic. Determine the exit area of the nozzle, the overall nozzle efficiency, and the entropy generation in the process.