Question 10 of 30
What is lower flammable limit?
A
The concentration of a hydrocarbon gas in air below which there is insufficient hydrocarbon to support combustion
B
The limit where there is insufficient oxygen to support combustion
C
The limit where there is too much oxygen to support combustion
D
The limit for man entry of personnel into tanks
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Answer & Explanation
The correct answer is Option A: The concentration of a hydrocarbon gas in air below which there is insufficient hydrocarbon to support combustion.
The Lower Flammable Limit (LFL) is the lowest concentration of a gas in air that can support combustion; below this limit, the mixture is too 'lean' (insufficient fuel) to ignite.