1) Steam at 4 MPa and 400°C is throttled adiabatically to a pressure of 1 MPa. If the change in kinetic energy is negligible, find the specific volume of the steam after throttling. 2) Saturated mixture refrigerant 134a vapor at 40°C with a quality of 90% is condensed as it flows through a tube of 3 cm inner diameter and a velocity rate of 5.1 m/s. The condensate leaves the tube as saturated liquid at 40°C. Calculate the rate of heat transfer from the tube in kW. 3) A 1 m3 rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries air at 200 kPa and 120 °C. Now the valve is opened, and air is allowed to flow into the tank until the pressure reaches 200 kPa, at which point the valve is closed. Determine: a. The flow work (i.e. Pv work) of the air in the supply line b. The final temperature of the air in the tank c. The mass of the air that entered the tank Air 200 kPa, 120°C Initially evacuated

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