When an ideal gas undergoes isothermal expansion as a closed system, its specific internal energy: a.increases b.decreases c.has no change

20 g of air undergoes a closed cycle, illustrated in Figure Q2, which consists of the following 3 processes: 1-2 Constant pressure heat rejection. 2-3 Constant volume heat addition. 3-1 Isothermal expansion back to the original conditions. P (kPa) 75 1 V (m') 0.025 0.04 Figure Q2: Three process cycle Given that Rair = 287 J/kg-K, and Cy = 718 J/kg-K, and assuming ideal gas conditions throughout: (a) Determine the temperatures at points 1, 2 and 3, and the pressure at point 3. (b) Determine the work during each process, and the net work from the cycle. (c) Determine the heat transferred during each process. (d) Verify that this is a cycle.

When an ideal gas undergoes isothermal compression as a closed system, its specific internal energy Decreases Does not change O Increases

For adiabatic process, pressure before and after the process are 8000 kN/m2 and 2 bar respectively. The volume before and after the process are 4000 mm and 40 cm³ respectively. Then the adiabatic index is O A. None of the answers given O B. 3.4 O C. 2.4 O D. 1.4