Amultistage axial flow compressor is required for compressing air at 20°c, through a pressure ratio of 5, each stage is to be 50% reaction and mean blade speed 275 m/s. flow co-efficient is 0.5 and stage loading factor is 0.3 (taken constant for all stages for simplicity). a) determine the flow angles and number of stages required if polytropic efficiency is 59%. take cp =1.005 kj/kg/k. b) calculate overall efficiency.