A citybus engine has the following characteristics: Engine displacement: 12.9 liters 6 cylinders, in-line placement; Fuel: Diesel Compression ratio: 18.5:1 Cut-off ratio: 2.5 The engine's inlet conditions are 20C and 1 bar Maximum engine pressure: 5 MPa Using an ideal air-standard Diesel cycle, calculate the following and remember to show all your calculations: a. the temperature and pressure at state points 1, 2, 3, and 4. (15) b. the heat and work transferred in each of the four processes. (20) c. The cycle's thermal efficiency. (5) 12.9-liter DAF diesel engine, courtesy of DAF/Paccar Trucks https://www.dafcomponents.com/en/products/paccar-daf-engines Summarize your calculated values of temperature, pressure, heat, work, and change in internal energy. (-5 points if tables are not completed.) Process q (kJ/kg) 1-2 2-3 3-4 4-1 w (kJ/kg) Au (kJ/kg) State T(K) p (kPa) point 1 2 3 4 Cycle: qnet Wnet=