Which condition leads to knocking (detonation) in gasoline engines?

💡 Explanation

Knocking occurs due to end-gas auto-ignition via chain branching because unburnt fuel-air mixture ahead of the flame front spontaneously ignites as its temperature and pressure increases; therefore, auto-ignition causes knocking, rather than controlled combustion.

• Which risk increases when excessively increasing capacitive discharge into inductive ballast?
• Within a semi-metal, which outcome occurs when strain alters the band overlap?
• Which risk increases when a spacecraft shield undergoes rapid micrometeoroid bombardment?
• Which outcome arises when estimating pressure drop through a venturi meter using Bernoulli's equation without accounting for a high Reynolds number?
• Which oscillatory outcome arises when a capacitive load switches?
• Which adverse outcome happens when a subsonic aircraft exceeds its critical Mach number during flight?