Question 9 of 30
What is Upper flammable limit?
A
The limit for man entry of personnel into tanks
B
The concentration of a hydrocarbon gas in air above which there is insufficient oxygen to support combustion
C
The limit where there is insufficient inert gas to support combustion
D
The limit where there is too much inert gas to support combustion
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Answer & Explanation
The correct answer is Option B: The concentration of a hydrocarbon gas in air above which there is insufficient oxygen to support combustion.
The Upper Flammable Limit (UFL) is the maximum concentration of a hydrocarbon gas in air above which the mixture is too 'rich' (insufficient oxygen) to support combustion.