Which limitation arises when real heat engine approaches Carnot cycle's theoretical efficiency limits:?

💡 Explanation

As a real engine approaches the Carnot cycle, maximizing efficiency means employing reversible processes. However, this necessitates infinitesimally slow heat exchange and minimal temperature gradients, which in practice creates unacceptable large energy loses due to irreversible heat exchange. Therefore, elevated losses result rather than lubrication problems, decrease strength, or high maintenance, which arise from other operational stresses.

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