1.

Three moles of an ideal gas C_(p) = 7//2 R at pressure P_(A) and temperature T_(A) is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally the gas is compressed at constant volume to the original pressureP_(A).The correct P-V and P-T diagram indicating the process are

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SOLUTION :LET the PROCESS starts from initial pressure `P_(A)`,volume `V_(A)`and temperature `T_(A)`.
I. Isothermal expansion (PV = CONSTANT) at temperature `T_(A)`to twice the initial volume `V_(A)` II. Compression at constant pressure `P_(A)//2` to original volume `V_(A) (i.e., V propto T)`
III. Isochoric process (at volume `V_(A)`) to initial conditions `(i.e., P propto T)`.


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