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Which outcome increases when a jet afterburner mixes suboptimal fuel?

A)Increased unburnt hydrocarbon emissions
B)Turbine blade fatigue strengthens
C)Optimal stoichiometric combustion occurs
D)Mass flow rate becomes constant

💡 Explanation

Increased unburnt hydrocarbon emissions occurs because incomplete combustion takes place; the afterburner's limited mixing leads to fuel-rich zones undergoing pyrolysis, whose outcome is uncombusted hydrocarbons, therefore emissions increase; rather than completely oxidizing, it forms byproducts.

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