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Q1. A perfect gas at a temperature of 50℃ is compressed according to the law PV^1.28 = constant. The volume compression ratio is 18: 1.

It is then heated at constant volume at the end of which, the specific entropy has changed by 0.4188 kJ/ kg K.

(a) Calculate EACH of the following:

(i) The overall change in specific internal energy;(3)

(ii) The net specific heat transfer; (4)

(iii) The overall change in specific entropy. (4)

(b) Sketch the process on a Temperature – specific entropy diagram showing:

(i) The temperatures;(2)

(ii) The value of EACH specific entropy. (3)

Note: for the gas C_V = 0.718 kJ/ kg K, R = 0.287 kJ/ kg K