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← ScienceWhich risk increases when an Otto cycle engine operates with high intake air temperature?
A)Increased likelihood of engine knocking✓
B)Decrease in exhaust valve efficiency
C)Reduction in cylinder compression ratio
D)Elevation of oil pump lubrication failure
💡 Explanation
High intake air temperature causes premature fuel-air mixture auto-ignition via thermal runaway; this is because of uncontrolled rapid oxidation prior to spark ignition, therefore engine knocking risk elevates, rather than optimized combustion.
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