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A gas undergoes a cyclic process a-b-c-a...

A gas undergoes a cyclic process a-b-c-a which is as shown in the PV diagram. The process a-b is isothermal, b-c is adiabatic and c-a is a straight line on P-V diagram. Work done in process ab and bc is 5 J and 4 J respectively. Calculate the efficiency of the cycle, if the area enclosed by the diagram abca in the figure is 3 J.

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