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← ScienceWhich outcome results when fuel injection pressure decreases in a diesel engine?
A)Increased unburnt hydrocarbon formation✓
B)Reduced nitrogen oxides production
C)Enhanced fuel atomization efficiency
D)Higher combustion chamber temperatures
💡 Explanation
Lower injection pressure reduces fuel atomization and increases unburnt hydrocarbons because it decreases the Reynolds number, creating a less turbulent flow during atomization. Therefore, unburnt hydrocarbons increase rather than decrease, as efficient combustion needs smaller droplet sizes at higher pressures.
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