(a) (b) (c) An aircraft is flying at an altitude of 10 km at a Mach number equal of 0.8. Its engine thrust is equal to 50 kN, air mass flow rate is equal to 45 kg/s and fuel mass flow rate is 2.65 kg/s. The fuel lower caloric value (LCV) is equal to 42.8 MJ/kg. Find the exhaust velocity from the engine if the speed of sound at 10 km is equal to 300 m/s. Find the propulsion, thermal and overall efficiencies. [13 Marks] [12 Marks] What is the physical sense of propulsive and thermal efficiencies? What is the thermal efficiency of modern turbines? ro Markel