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Q1. A mass of 1.55 kg of air at a pressure and temperature of 6 bar and 600℃ respectively, expands in an isothermal process.

At The end of expansion, the air is cooled at constant volume to a final pressure of 1.5 bar.

The change in specific entropy during the isothermal process is 0.166 kJ/kg K.

(a) Sketch The process on Pressure-Volume and Temperature-specific entropy diagrams.(2)

(b) Calculate EACH of the following:

(i) The network transfer; (4)

(ii) The net heat transfer; (6)

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

Note: for air R = 287 J/kg K,  1.4.