The optimum percentage of excess air for combustion depends upon the _______________ of the fuel?
Correct answer: A. Type (solid, liquid or gaseous)
- A. Type (solid, liquid or gaseous)
- B. Calorific value
- C. Sulphur content
- D. Ignition temperature
Explanation
Solid fuels generally need more excess air than liquid fuels, while gaseous fuels need the least because mixing with air is more uniform. Thus, the required excess-air percentage depends mainly on the physical type of fuel.
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