Which thermodynamic cycle serves as the ideal reversible heat engine operating between two thermal reservoirs, establishing the theoretical upper limit for conversion efficiency?

💡 Solution & Explanation

The Carnot cycle represents an idealized thermodynamic cycle composed of reversible isothermal and adiabatic expansions and compressions, yielding the maximum possible thermal efficiency between hot and cold temperature reservoirs. The Rankine cycle models vapor power plants utilizing working fluid phase changes. The Otto cycle approximates spark-ignition internal combustion engines. The Diesel cycle describes compression-ignition internal combustion engines.