Q1: Air at 20 bar is initially contained a vessel at volume 1 m3 and connected with another vessel has unknown volume and evacuated from the air, the two vessels are insulated, the valve between the...

Extracted text: Q1: Air at 20 bar is initially contained a vessel at volume 1 m3 and connected with another vessel has unknown volume and evacuated from the air, the two vessels are insulated, the valve between the two vessels is opened, the gas expands and fill the two vessels, calculate the final volume if the final pressure of air is 10 bar. Q2: Steam at 150 bar has an enthalpy of 3309 kJ/kg, find the temperature, the specific volume and the internal energy. Explain the solution steps in details. Q3 The gases in the cylinder of an internal combustion engine have a specific internal energy of 800 kJ/kg and specific volume of 0.06 m3/kg at the beginning of expansion. The expansion of the gases may be assumed to take place according to a reversible law, pv"= constant, from 55 bar to 1.4 bar. The specific internal energy after expansion is 230 kJ/kg. Calculate the heat rejected to the cylinder cooling water per kilogram or gases during the expansion stroke.The worke done by the system is 465.96 kj/kg