Which mechanism reduces thermal efficiency when exceeding a heat engine's design temperature limits?

💡 Explanation

When exceeding design temperature, increased heat differences induce larger, faster heat transfers occurring in an uncontrolled manner and becoming an irreversible heat leak within the engine. Therefore efficiency reduces due to parasitic losses rather than altering reaction rates, cooling, or material strength which are secondary effects.

• Which risk increases when a magnetohydrodynamic generator experiences high plasma turbulence?
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