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Which consequence results when micro-combustion gas engines operate near quenching distances?

A)Flame volume remains relatively constant
B)Heat transfer increases convectively
C)Unburned fuel slip increases sharply
D)Thermal efficiency slowly approaches unity

💡 Explanation

Increased unburned fuel slip occurs near quenching distances because flame propagation is inhibited by heat losses to the walls; the *quenching effect* prevents complete oxidation. Therefore, fuel escapes uncombusted, rather than burning completely, leading to lower efficiency under altered conditions.

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