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Which outcome results when an adiabatic diesel engine compression ratio increases?

A)Increased peak combustion temperature
B)Decreased exhaust NOx formation
C)Reduced engine thermal efficiency
D)Elevated unburned hydrocarbon emissions

💡 Explanation

When the compression ratio increases, adiabatic compression causes elevated temperatures because work done compresses the air, with minimal heat loss increasing internal energy. Therefore peak combustion temperature rises from reduced cooling, as compression causes molecules to cluster, rather than alternatives involving diminished performance.

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