Q.1 (a): A gas turbine plant draws in air at 1.013 bar, 10 °C and has a pressure ratio of 5.5. The maximum temperature in the cycle is limited to 750°C. Compression is conducted in an uncooled rotary compressor having an isentropic efficiency of 82%, and expansion takes place in a turbine with an isentropic efficiency of 85%. A heat exchanger with an efficiency of 70% is fitted between the compressor outlet and combustion chamber. For an air flow of 40 kg/s, find a) The overall efficiency, b) Turbine output, and c) Air fuel ratio if the calorific value of fuel used in 45.22 MJ/kg. [20]