CHEMCO Exit Exam • Set 8 Question 2 of 30
On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen, lying tangent to the flammability range, is called the
✓
Direct Answer
Option C: critical dilution line
The critical dilution line on a hydrocarbon flammability chart represents the minimum oxygen concentration required for combustion, indicating the point at which dilution with inert gas becomes effective in preventing fire.
All Options
A
minimum oxygen content line upper threshold limit
B
critical displacement line
C
critical dilution line
(Correct Answer)
D
upper threshold limit
Detailed Explanation & Context
The critical dilution line on a hydrocarbon flammability chart represents the minimum oxygen concentration required for combustion, indicating the point at which dilution with inert gas becomes effective in preventing fire.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).
Advertisement
Practice Full CHEMCO Set 8
Test yourself with 30 interactive questions, live timer, and instant score.