Question

1. Propane is compressed from an initial state with a pressure of 100 lbf/in2 and a quality of 0.40 to a final saturated liquid state with a temperature is 50°F. Is it possible for this process to occur adiabatically? Justify your answer.

2. Air is contained in a rigid, well-insulated container of volume 3 m3. The air undergoes a process from an initial state with a pressure of 200 kPa and temperature of 300 K. During the process, the air receives 720 kJ of work from a paddle wheel. Model the air as an ideal gas with constant specific heats. Evaluate the specific heats at 300 K. Neglect changes in kinetic energy and potential energy. Determine the mass of the air in kg, the final temperature of the air in K, and the amount of entropy generated by irreversibilities during the process in kJ/K.

3. Ammonia is contained in a piston-cylinder assembly. The ammonia undergoes a reversible, isobaric process from an initial pressure of 30 lbf/in2 and volume of 4 ft3/ to a final temperature of 70° F. The mass of ammonia is 0.35 lb. Determine the amount of work done on the ammonia in Btu, the amount of heat transfer to the ammonia in Btu, and the temperature at which the heat transfer occurs in °F. Assume that the heat transfer occurs at a constant temperature. Neglect changes in kinetic energy and potential energy.

4. An ideal gas is contained in a piston-cylinder assembly. The gas undergoes an isothermal expansion from an initial state with pressure of 0.5 MPa and temperature of 600 K to a final state with a pressure of 0.4 MPa. Heat transfer from the surroundings occurs at a temperature of 900 K. The ideal gas has a molar mass of 28 kg/kmol and a specific heat at constant volume of 0.78 kJ/(kg∙K). Determine the amount of specific work done on the gas in kJ/kg, the amount of specific heat transfer to the gas in kJ/kg, and the amount of specific entropy generated by irreversibilities during the process in kJ/(kg∙K). Neglect changes in kinetic energy and potential energy.

Answer 1

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