For compression work to be minimum, what should be process of compression? Is it used din practice?

Question

(i) 0.5 m³ of gas at kPa and 130⁰C expands adiabatically to 1 kPa. It is then isothermally compressed to its original volume.

C_p = 1.005 kJ/kg-K and C_v = 0.718 kJ/kg-K. Represent these processes on P-V diagram. Find final temperature and pressure of gas.

(ii) For compression work to be minimum, what should be process of compression? Is it used din practice?