Question 6 of 30
"Below lower flammable limit" means:
A
The vapor mixture is highly volatile and ready to explode
B
It is a mixture of hydrocarbon gases which is not sufficient to initiate a fire (too lean)
C
The atmosphere is completely saturated with fuel vapors (too rich)
D
There is insufficient structural oxygen available for combustion
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Answer & Explanation
The correct answer is Option B: It is a mixture of hydrocarbon gases which is not sufficient to initiate a fire (too lean).
"Below lower flammable limit" means the concentration of flammable vapor in the air is too low to sustain combustion. The mixture is too lean, and an ignition source will not cause it to burn or explode.