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Q1. Air at 8.1bar, 0.024 m³ and 490 K with a mass of 0.138 kg of air is expanded isothermally to 5.2 bar.

The system is then further expanded polytropically to 2.8 bar and 416 K.

(a) Calculate EACH of the following:

(i) the polytropic index of expansion;

(ii) the net work;

(iii) the net heat;

(iv) the total change in entropy.

(b) Sketch the PV and TS diagrams.

Note: C_v, C_p and Rare 718 J/kgK, 1005 J/kgK and 287 J/kgK respectively.