During combustion of gaseous fuels, deficiency of air_________________?
Correct answer: B. Lengthens the flame
- A. Tends to shorten the flame
- B. Lengthens the flame
- C. Does not affect the flame length
- D. Increases the flame temperature
Explanation
A deficiency of air causes incomplete mixing and combustion, so the flame generally becomes longer and more luminous. Increasing flame temperature would require better, not deficient, combustion conditions.
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