Q1/ Two engine options are to be offered in a new automobile model. Engine A is naturally aspirated engine with a compression ratio of 10.5 and cylinder inlet conditions of 60 C and 96 kPa. Engine B is supercharged with aftercooling and has cylinder inlet conditions of 80 "C and 130 kPa. To avoid knock problems, it is desirable to have the air fuel temperature at the start of combustion in engine B to be the same as in engine A. Calculate 1. Temperature at start of combustion in engine A. 2. Compression ratio of engine B which would give the same temperature at the start of combustion 3. Temperature reduction in the aftercooler of engine if the compressor has an isentropic efficiency of 82% and inlet conditions are the same as in engine A QI/ Two engine options are to be offered in a new automobile model. Engine A is naturally aspirated engine with a compression ratio of 10.5 and cylinder inlet conditions of 60C and 96 kPa. Engine B is supercharged with aftercooling and has cylinder inlet conditions of 80 "C and 130 kPa. To avoid knock problems, it is desirable to have the air fuel temperature at the start of combustion in engine B to be the same as in engine A. Calculate 1. Temperature at start of combustion in engine A. 2. Compression ratio of engine B which would give the same temperature at the start of combustion 3. Temperature reduction in the aftercooler of engine if the compressor has an isentropic efficiency of 82% and inlet conditions are the same as in engine A