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← TechnologyWhich outcome occurs when an internal combustion engine piston approaches top dead center with excessive carbon accumulation?
A)Increased connecting rod bending stress
B)Reduced volumetric efficiency of cylinder
C)Premature detonation from hot spots✓
D)Elevated oil consumption indicated by blue smoke
💡 Explanation
When the piston approaches TDC with carbon buildup, autoignition occurs because the carbon deposits retain heat. This creates hot spots in the cylinder that ignite the air-fuel mixture before the spark, leading to premature detonation. Therefore, premature detonation results, rather than bending; efficiency drop or burning, which require different failure mechanisms.
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