Question 37Safety & Environmental - Assistant Engineer70% to pass
The explosive range of methane is 5% to 15% by volume in air. This means a vapor/air mixture of _______________.
AI Explanation
The correct answer is B) 5 percent methane by volume will give a reading of 100 percent L.E.L. on a combustible gas indicator.
This is because the explosive range of methane is 5% to 15% by volume in air. At 5% methane by volume, the mixture is at the lower explosive limit (L.E.L.), meaning it is the minimum concentration of methane needed to sustain an explosion. A combustible gas indicator would read 100% L.E.L. at this concentration.
The other options are incorrect because: A) 3% is below the L.E.L., C) 10% is within the explosive range but not at the L.E.L., and D) 20% is above the upper explosive limit and is too lean to burn.
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