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Q1. A mass of 1 kg of argon at a pressure and temperature of 20 bar and 127℃ respectively, expands in an isentropic process to a pressure of 2 bar.

It is then compressed to the original pressure according to the law PV_n = constant. The overall decrease in entropy is 0.217 kJ/K.

(a) Sketch the processes on Pressure-Volume and Temperature-specific entropy diagrams. (2)

(b) Calculate EACH of the following:

(i) The temperature at the end of compression; (3)

(ii) The polytropic index of compression; (4)

(iii) The net work transfer;(4)

(iv) The net heat transfer. (3)

Note: For Argon γ = 1.67 , C_P = 520.3  J⁄(kg K)