_____________ fuels require the maximum percentage of 'excess air' for complete combustion ?
Correct answer: D. Solid
- A. Nuclear
- B. Liquid
- C. Gaseous
- D. Solid
Explanation
Solid fuels generally need the greatest excess air because their fuel-air mixing is less uniform and combustion is slower than with liquid or gaseous fuels. Extra air helps ensure complete combustion.
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