Question 990Deck General70% to pass
On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen, lying tangent to the flammability range, is called the _______________.
AI Explanation
The correct answer is B) critical dilution line.
The critical dilution line on a hydrocarbon flammability chart represents the minimum oxygen concentration required to maintain a flammable mixture. This line extends from 0% to 21.8% oxygen and is tangent to the flammability range, indicating the boundary between flammable and non-flammable mixtures. Below this line, the oxygen concentration is too low to support combustion, while above this line, the mixture is not flammable.
The other options are incorrect because:
A) The minimum oxygen content line is not the same as the critical dilution line.
C) The critical displacement line is a different concept related to the displacement of oxygen by an inert gas.
D) The upper threshold limit is not a specific term used in the context of hydrocarbon flammability charts.
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