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Q1. A mass of 0.5 kg of gas is at a pressure and temperature of 4 bar and 60℃ respectively.

It is heated at constant volume until the pressure is 12 bar and then cooled at constant pressure to the initial temperature. It then undergoes isothermal expansion to the initial pressure.

The change in specific entropy for the isothermal process is 2.282 kJ/kg K.

(a) Sketch the processes on EACH of the following:

(i) A Pressure-volume diagram; (1)

(ii) A Temperature-specific entropy diagram. (2)

(b) Calculate EACH of the following:

(i) The maximum and minimum volume of the gas; (5)

(ii) The net work transfer; (3)

(iii) The change in entropy for the constant pressure process. (5)

Note: for the gas C_V = 3.116 kJ/kg K.