OCTCO/OCTF Exit Exam • Set 9 Question 1 of 30
The minimum oxygen required for combustion?
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Direct Answer
Option B: 16%
Combustion of typical hydrocarbon vapours cannot be sustained when the oxygen concentration in the mixture falls below approximately 11% by volume (16% being the minimum required for open free-burning flames in air).
All Options
A
5%
B
16%
(Correct Answer)
C
8%
D
21%
Detailed Explanation & Context
Combustion of typical hydrocarbon vapours cannot be sustained when the oxygen concentration in the mixture falls below approximately 11% by volume (16% being the minimum required for open free-burning flames in air).
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Oil and Chemical Tanker Cargo Operations (OCTCO/OCTF).
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