A thermodynamic cycle in the pressure P -volume V plane is given below: AB and CD are isothermal processes while BC and DA are adiabatic processes. The same cycle in the temperature T - entropy S plane is :

Step-by-step solution

AB is isothermal reversible expansion process i.e. ΔT = 0 and S increases as there is increase in volume. BC is adiabatic reversible expansion process q rev = 0 i.e. temperature decreases and ΔS = 0 CD is isothermal reversible compression process i.e. ΔT = 0 and S decreases as there is decrease in volume. DA is adiabatic reversible compression process q res = 0 i.e. temperature decreases and ΔS = 0