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← ScienceWhich consequence results when an exhaust catalyst degrades?
A)Increased uncombusted hydrocarbon emissions✓
B)Decreased air-fuel mixture equivalence ratio
C)Elevated engine oil viscosity breakdown
D)Premature oxygen sensor fouling
💡 Explanation
Increased uncombusted hydrocarbon emissions results because catalyst surface area diminishes via sintering, leading to reduced active sites for oxidation; therefore, hydrocarbons bypass the catalytic converter, rather than being converted to less harmful substances under ideal catalyst function.
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