Which outcome occurs when direct injection spark-ignition engine compression ratio exceeds octane rating limit?

💡 Explanation

When compression ratio exceeds the fuel's octane rating, autoignition occurs because the increased pressure and temperature cause uncontrolled combustion before spark ignition, resulting in engine knock caused by pressure waves. Therefore engine knock results, rather than other failures which require different operational or mechanical breakdowns.

• Which quantum mechanical phenomenon limits the minimum size of a flash memory cell?
• Which consequence results when surface oxidation depletes free electrons?
• Which outcome occurs when uranium enrichment falls too low?
• Which risk increases when simulating general relativity near black hole using Newtonian gravity?
• Which risk increases when cryogenic liquid nitrogen leaks into a closed room at standard temperature?
• Which consequence results when excessive **group velocity dispersion** distorts optical signals?