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← ScienceWhich outcome occurs when a diesel engine's EGR valve sticks in the open position during high-speed operation?
A)Increased particulate matter emissions✓
B)Reduced engine knocking tendency
C)Elevated peak combustion temperatures
D)Improved fuel conversion rate
💡 Explanation
When the EGR valve stays open, more exhaust gas recirculates as part of the EGR mechanism bypassing the turbocharger benefit because excess inert gas reduces available oxygen for the combustion reactions causing incomplete combustion, raising particulate matter (PM). Therefore, increased particulate emissions result, rather than reduced knocking, elevated temperatures, or efficiency gains, which need optimized air-fuel-EGR ratios.
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