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Which emissions does incomplete combustion produce?

  • A.Carbon monoxide and unburnt hydrocarbons
  • B.Nitrogen oxides, which are formed by the combination of nitrogen and oxygen at the high combustion temperature
  • C.Carbon dioxide only
  • D.Carbon monoxide from insufficient oxygen and hydrocarbons from fuel that has not burnt at all within the cylinder

Answer: A

Insufficient oxygen or poor mixing leaves carbon monoxide and raw fuel. The last option explains exactly both mechanisms, which makes it a correct and more instructive version. Nitrogen oxides come from high temperature instead. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Checking which component actually carries the load settles most questions of this kind at once.

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