Question

Incomplete burning might take place when -

• A. the oxygen supply is limited.
• B. there are inflammable impurities in the fuel.
• C. certain fuel components burn too fast.
• D. there is excess oxygen.

Answer 1

The correct option is A

the oxygen supply is limited.

Incomplete burning might take place when there is a limited supply of oxyge or when the fuel has components which just don't burn. When there are non-inflammable components, they will not burn and will result in ash or suspended particles.

If the oxygen supply is limited, the entire fuel may not get used up an some parts will remain unburnt.