Question

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

Answer 1

Unburnt hydrocarbons are one of the major exhaust emissions from CI engines.

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Answer 2

Answer:

Unburnt hydrocarbons are one of the major exhaust emissions from CI engines compared to SI engines.

Explanation:

• SI engine is internal combustion engine . SI engine operates on the principle of spark ignition. It uses petrol and utilizes the Otto cycle.

• The diesel (CI) engine is also an internal combustion engine and it uses diesel fuel and operates on diesel cycle.

• Drawback to CI engines is the emissions signature. There is significant stratification between the fuel and air, as opposed to the homogeneity of gasoline/air mixtures in SI engines. This stratification creates particulate matter (PM) and oxides of nitrogen (NOx). These undesired products of CI combustion is a health hazard and environmentally harmful.