- 360 An Ideal Gas Initially At 650 K And 9 Bar Undergoes A Four Step Mechanically Reversible Cycle In A Closed System In 1 (75.63 KiB) Viewed 15 times
360 An ideal gas initially at 650 K and 9 bar undergoes a four-step mechanically reversible cycle in a closed system. In step 12, pressure decreases isothermally to 3 bar; in step 23, pressure decreases at constant volume to 2 bar; in step 34, volume decreases at constant pressure; and in step 41, the gas returns adiabatically to its initial state. Take Cp = (7/2)R and Cv = (5/2)R. (a) Sketch the cycle on a PV diagram. (b) Determine (where unknown) both T and P for states 1, 2, 3, and 4. (c) Calculate Q, W, AU, and AH for each step of the cycle. [Marks =8]