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← ScienceWhich outcome reduces efficiency when an internal combustion engine operates far from optimum torque/RPM in short driving cycles?
A)Increased pumping losses at low loads✓
B)Lean misfire due to cold cylinders
C)Elevated hydrocarbon emissions from quench
D)Excessive boost causes compressor surge
💡 Explanation
Increased pumping losses reduce efficiency at low loads because throttling increases intake manifold vacuum, decreasing pressure differential during intake; therefore extra energy is wasted during each cycle operating at reduced power output rather than efficient power extraction at rated point.
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