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← ScienceWhich 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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