Which efficiency constraint arises if a heat engine operates with an irreversible cycle?

💡 Explanation

When a heat engine's cycle is irreversible, processes generate entropy because friction, rapid expansion and non-equilibrium heat transfer violate ideal reversible conditions, making the Carnot efficiency unattainable. Therefore the Carnot limit becomes unattainable, rather than simply lowering power or altering peak pressure, which could theoretically still reach Carnot efficiency under ideal/isothermal conditions.

• Which mechanism causes embrittlement of high-strength steel when welded underwater?
• Which consequence results when excessive vacancies concentrate within a metal's lattice?
• Which failure results when sodium chloride experiences hydrolytic cleavage?
• Which outcome occurs when the energy of an incident electron matches a molecule's unoccupied molecular orbital energy?
• Which mechanism initiates epoxy thermoset polymer degradation under prolonged UV exposure?
• Which changes in the reaction will occur when excess reactant continuously removes a product in a reversible esterification?