4.The air fuel ratio of the diesel engine is 29:1 and compression ratio is 16:1. The temperature at the end of compression being 900K. Find at what cylinder volume, the combustion is complete. Express this volume as a percentage of stroke. Assuming that the combustion begins at top dead centre and takes place at constant pressure. Take Calorific value of the fuel as 42 MJ/kg, Cv = (0.709 0.000028T) KJ/kg/K. also determine the cut-off as the percentage of stroke