Preheating of combustion air is done to ___________________?
Correct answer: D. Increase the adiabatic flame temperature
- A. Reduce its requirement for effecting the complete combustion
- B. Increase the calorific value of the fuel
- C. Complete the combustion of fuel
- D. Increase the adiabatic flame temperature
Explanation
Preheating combustion air supplies part of the sensible heat before combustion begins, raising the adiabatic flame temperature. It does not increase the fuel's calorific value or change the theoretical oxygen requirement.
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