1. In an air standard diesel cycle, the compression ratio is 20 and the cut-off ratio is 2. The pressure and temperature at the start of the compression stroke are

1 bar and 27°C. a) Sketch P - V and T – S diagrams of the cycle. [4 marks Take: *Specific heat at constant pressure = 1.005 kJ/kg K. *Specific heat at constant volume = 0.718 kJ/kg K Determine: b) The pressure at which the heat is added. [2 marks] c) The temperature of air at each point in the cycle. [6 marks] d) The net work done per kg of air. [4 marks] e) The cycle thermal efficiency. [2 marks] f) The thermal efficiency of the corresponding Carnot cycle operates between the same temperature limits. [2 marks] g) The mean effective pressure of the cycle. [2 marks] h) Comment on the effect of cut-off ratio and compression ratio on the overall cycle efficiency of Diesel cycle. [3 marks]