AFF Exit Exam • Set 5 Question 8 of 30
"Below lower flammable limit" means:
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Direct Answer
Option C: 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.
All Options
A
The vapor mixture is highly volatile and ready to explode
B
There is insufficient structural oxygen available for combustion
C
It is a mixture of hydrocarbon gases which is not sufficient to initiate a fire (too lean)
(Correct Answer)
D
The atmosphere is completely saturated with fuel vapors (too rich)
Detailed Explanation & Context
"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.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).
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