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← ScienceWhich risk is amplified when an ICE compression ratio increases?
A)Increased fuel auto-ignition probability✓
B)Reduced exhaust NOx formation
C)Decreased cooling system efficiency
D)Lower indicated thermal efficiency
💡 Explanation
Increasing the compression ratio in an internal combustion engine raises the air temperature during compression; this raises the probability of auto-ignition because it exceeds auto-ignition temperature, therefore causing engine knocking, rather than achieving ideal combustion phasing.
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