Which phenomenon reduces efficiency when an Internal Combustion Engine runs lean?

💡 Explanation

Lean mixtures decelerate flame propagation because the reduced fuel limits the **radical chain branching** steps in combustion; therefore, unburned fuel results, rather than efficient expansion, because the flame quenches prematurely near the cylinder walls.

• Which consequence results when electron concentration exceeds gate oxide tolerance?
• Which outcome results when high voltage causes dielectric breakdown in solid barium chloride?
• Which outcome occurs when airspeed exceeds design limits on commercial aircraft wings?
• Which consequence results when normalization of quantum wave functions fails?
• Which outcome occurs when an endothermic reaction is continuously driven in a closed reaction vessel?
• Which risk increases when applying excessive voltage to a capacitor?