Question 225Safety & Environmental - Assistant Engineer
70% to passWhich of the conditions listed is necessary for a substance to burn?
AThe mixture of vapors with air must be between the LEL and the UEL.
BThe air must contain oxygen in sufficient quantity.
CThe temperature of the substance must be equal to or above its fire point.
DAll of the above.
AI Explanation
The correct answer is D) All of the above. For a substance to burn, the following three conditions must be met: 1) The mixture of vapors from the substance with air must be between the Lower Explosive Limit (LEL) and the Upper Explosive Limit (UEL). This ensures the right fuel-to-air ratio for combustion to occur. 2) The air must contain sufficient oxygen to support the combustion reaction. 3) The temperature of the substance must be equal to or above its fire point, the minimum temperature required to initiate and sustain combustion. The other answer choices are incorrect because they only address one or two of these necessary conditions, rather than all three required for a substance to burn.
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