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Which of the following is one of the major exhaust emissions from CI engines compared to SI engines?

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Which of the following is one of the major exhaust emissions from CI engines compared to SI engines?

(a) Oxides of nitrogen

(b) Particulates

(c) CO and CO2

(d) Unburnt hydrocarbon

I got this question in exam.

My query is from Engine Emissions in section Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

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Correct answer is (b) Particulates

For explanation I would say: Unburnt hydrocarbons are one of the major exhaust emissions from CI engines. The components in diesel fuel have higher molecular weight.

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