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Q2. A perfect gas expands reversibly in a cylinder according to the law pV^1.5 = constant and is then heated at constant volume.

The initial pressure and temperature are 90 bar and 1800℃ respectively.

The final pressure is 2 bar and the final volume is twenty times the initial volume.

(a) Sketch the processes on Pressure-Volume and Temperature-specific entropy diagrams. (4)

(b) Calculate EACH of the following:

(i) the temperature after expansion; (2)

(ii) the final temperature; (2)

(iii) the net change in specific entropy. (8)

Note: For the gas R = 0.287 kJ/kg K and γ = 1.33