Question

Consider a cycle followed by an engine as shown in fig



• Process 1 - 2 is isothermal
• Process 2 - 3 is adiabatic
• Process 3 - 1 is adiabatic
Such a cycle does not exist because :

• A. Mechanical energy is completely converted to heat, which is not possible
• B. Curves representing two adiabatic processes don't intersect.
• C. Curve representing an adiabatic and an isothermal process don't intersect.
• D. Efficiency of this cycle is more than the Carnot cycle, which is not possible.

Answer 1

The correct option is B Curves representing two adiabatic processes don't intersect.

Two adiabatic curves can not intersect otherwise it will violate the Kelvin-Plank statement