. One giam mole of LG. is taken through a four-step cycle. The gas is subjected to isothermal expansion (A to B) at 600 K from 5 to 4 bar, an adiabatic expansion to 3 bar (B to C), constant pressure cooling (C to D), and constant volume heating (D to A). Cp is constant at 30 kJ/kg mole K, and it is irreversible process with 80 % efficiency. Calculate Q, W, AU and AH for each step and entire cycle