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Which outcome is implied when a diesel engine operates above designed boost?

A)Increased unburned hydrocarbon emissions
B)Enhanced convective heat transfer
C)Improved adiabatic flame temperature
D)Reduced engine knock tendency

💡 Explanation

Exceeding designed boost pressure increases cylinder air density, which leads to fuel-rich combustion and incomplete burning. This happens because of incomplete Autoignition, therefore increased unburned hydrocarbon emissions result, rather than improved combustion or adiabatic flame temperature at each cycle.

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