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Academics – Applied Heat : 2014/APR/01
Question

Q7. A perfect gas expands reversibly in a cylinder according to the law pV1.13 = constant and is then cooled at constant volume. The initial pressure is 60 bar, the initial temperature is 1500°C and the final pressure is 2.8 bar. The final volume is five times the initial volume.

(a) Sketch the processes on p-V and T-S diagrams.

(b) Calculate EACH of the following:

(i) The temperature after expansion

(ii) The final temperature

(iii) The total heat transfer per kg

(iv) The total change in specific entropy.

Note: For the gas, R = 0.189 kJ/kg K and g = 1.23

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