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← ScienceWhich inefficiency increases when combustion timing drifts from optimal during diesel engine cycles?
A)Increased exhaust gas recirculation
B)Reduced boundary layer separation
C)Elevated unburned fuel emissions✓
D)Improved heat exchanger effectiveness
💡 Explanation
Delayed combustion timing causes incomplete fuel oxidation during each cycle because available oxygen decreases as the piston moves, therefore, unburned fuel emissions increase, rather than other effects, because the expansion stroke's efficiency diminishes.
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