**Question **# 1. The specific entropy of a system is an extensive property of the system. 2. Losing heat is the only mechanism by which the entropy of a closed system decreases. 3. The entropy of an adiabatic (isolated) system can never decrease. 4. Entropy can neither be created nor destroyed. 5. In a heating process at 100 kPa, the temperature of H2O is raised from 40°C to 80°C. The specific entropy of liquid water is increased by_____kJ/kg. K in this process. 6. Determine the change in entropy of 5-kg of Argon (an ideal gas) in a compression process specified by the following properties: Initial state:P1= 180 kPa, T1=40°C Final state:P2 = 270 kPa, T2=80°C 7. The entropy change of an ideal gas in a constant pressure process is lower than the entropy change ofthe same ideal gas in a constant volume process.T F 8. The temperature of liquids and solids remains constant during an isentropic process. 9. Entropy generation in reversible processes can never be zero. 10. In adiabatic processes, the entropy change is only due to the factors of irreversibility. 11. Steam enters an isentropic diffuser at 150 kPa and 120°C and leaves at 300 kPa. Determine the exit velocity if the inlet velocity is 550 m/s. 12. Re-134a enters an isentropic turbine as a saturated vapor at 1.4 MPa and leaves the turbine at 100kPa. Determine the mass flow rate of the refrigerant, if the power produced by the turbine is 0.14MW. 13. Steam is compressed from 300 kPa and 300°C to 1.2 MPa in an isentropic compressor. Determine the work input required per unit mass. 14. A 50-kg copper block initially at 140°C is dropped in an insulated tank that contains 90-kg of water at 10°C. Determine the total entropy change for this process. 15. Nitrogen (an ideal gas) is expanded in an isentropic process from 700 kPa and 70°C to 100 kPa.Determine the temperature of Nitrogen at the end of this expansion process.