A C-D nozzle is supplied from an air reservoir at 1000 kPa. It has an area ratio of (Aexit/Athroat) 4. Calculate: a. The range of back pressures over which there is subsonic flow in the diverging section of the nozzle (10 points) b. The range of back pressures when the flow is at the designed supersonic Mach number at exit of the nozzle (10 points)

Agas mixture with a compostion of 55 methane, 30% propane, and 15 butane by volume) is compressed from 1 bar and 25°c to 9bar in a compressor with an isentropic efficiency of 85%. the environment has a temperature of to25 c. determine (a) the exit temperature of the mixture (b) the specific work required to run the compressor (c) the specific entropy generation of the process (d) the specific exergy destruction of the process (e) the second law efficiency of the compressor