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Which outcome results when exceeding the Leidenfrost point on engine cylinders?

A)Increased engine knocking and detonation
B)Elevated oil viscosity and thickening
C)Reduced convective heat transfer rate
D)Accelerated cylinder liner surface corrosion

💡 Explanation

When exceeding the Leidenfrost point, vaporisation creates an insulating gas layer thereby reducing convective heat transfer, because the liquid coolant then inefficiently absorbs heat. Therefore, the cooling capacity diminishes rather than the given failure modes, because those rely on direct contact.

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