Three moles of an ideal gas $\left( {{C_P} = \frac{7}{2}R} \right)$ at pressure ${P_A}$ and temperature ${T_A}0$ 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 its original pressure ${P_A}.$ The correct $P-V$ and $P-T$ diagrams indicating the process are
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(a) Let the process start from initial pressure ${P_A},$ volume ${V_A}$ and temperature ${T_A}$.
(i) Isothermal expansion $(PV = {\rm{constant)}}$ at temperature ${T_A}$ to twice the initial volume ${V_A}$
Compression at constant pressure $\frac{{{P_A}}}{2}$ to original volume ${V_A}\,(i.e.\,V \propto T)$
(iii)Isochoric process (at volume ${V_A}$) to initial condition $(i.e.\,P \propto T)$
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