Which among the following emission increases with ignition advancement?(a) Carbon monoxide (CO)(b) Sulfur(c) Nitrogen oxides (NOx)(d) Particulate matterThis question was addressed to me during an online exam.My enquiry is from Ignition Advance in portion Conventional Ignition System of Automotive Engine Design

Which among the following emission increases with ignition advancement

1.	Which among the following emission increases with ignition advancement?(a) Carbon monoxide (CO)(b) Sulfur(c) Nitrogen oxides (NOx)(d) Particulate matterThis question was addressed to me during an online exam.My enquiry is from Ignition Advance in portion Conventional Ignition System of Automotive Engine Design
Answer» Right choice is (c) Nitrogen oxides (NOx) To explain: Nitrogen oxides (NOx) emission increases with an increase in ignition advance. However, emission of CO is not much AFFECTED by ignition timing, rather the same is INFLUENCED by air/fuel RATIO. And there is very little EFFECT of ignition advance on hydrocarbon.

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