With increase in ___________________ Knocking tendency in a spark ignition petrol engine decreases?
Correct answer: B. Engine speed
- A. Supercharging
- B. Engine speed
- C. Compression ratio
- D. Wall temperature
Explanation
Increasing engine speed reduces the time available for the unburned end-gas to undergo auto-ignition reactions, so knocking tendency generally decreases. Higher compression ratio and supercharging normally increase knocking tendency.
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