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Which outcome manifests in a jet engine's exhaust when fuel combustion deviates from a stoichiometric mixture at high altitude?

A)Increased unburned hydrocarbon emissions
B)Elevated turbine operating temperatures
C)Reduction in nitrogen oxide formation
D)Increased propulsive efficiency

💡 Explanation

Increased unburned hydrocarbons result from incomplete fuel combustion. Partial oxidation occurs because 'insufficient residence time' limits complete reactions in the lean mixtures prevalent at altitude; therefore increased unburned hydrocarbons are emitted, rather than complete combustion or altered NOx formation.

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