What is caused by incomplete combustion of fuels?
A. Smoke
B. NOx
C. CO
D. SOx
A. Correct. Smoke is caused by incomplete combustion of fuels.
B. Incorrect. Nitrogen oxides (NOx) are byproducts of the combustion of fuel at high temperatures or with fuel containing nitrogen (N2) compounds.
C. Incorrect. Carbon monoxide (CO) typically forms from the incomplete combustion of a fuel containing carbon.
D. Incorrect. SOx is sulphur oxide.
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