Question

A slight ___________ in lean mixture makes the engine operation irregular and intermittent.

(a) increase

(b) reduction

(c) heat

(d) none of the mentioned

This question was posed to me in an international level competition.

My doubt stems from Effects of Supercharging in chapter Supercharging of IC Engine

Answer 1

Answer: (b) reduction

Explanation: A slight reduction in the lean mixture (a decrease in the fuel-to-air ratio) can make the engine operation irregular and intermittent. Lean mixtures have less fuel relative to air, which can cause misfire, instability, and irregular combustion, especially in supercharged or turbocharged engines. This can affect engine smoothness and efficiency.