FPFF Exit Exam • Set 3 Question 25 of 30
The highest concentration of hydrocarbon gas in air below which there is sufficient amount of hydrocarbon gas to support combustion is called:
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Direct Answer
Option B: Upper Flammable limit
The Upper Explosive Limit (UEL) or Upper Flammable Limit (UFL) is the highest concentration of hydrocarbon gas in air that can support combustion; above this concentration, the mixture is too rich to burn.
All Options
A
Lower Flammable limit
B
Upper Flammable limit
(Correct Answer)
C
Ignitable mixture
D
None of the above
Detailed Explanation & Context
The Upper Explosive Limit (UEL) or Upper Flammable Limit (UFL) is the highest concentration of hydrocarbon gas in air that can support combustion; above this concentration, the mixture is too rich to burn.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Fire Prevention & Fire Fighting (FPFF).
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