Question 624 Deck Safety

70% to pass

The minimum concentration of a vapor in air which can form an explosive mixture is called the _______________.

A flash point
B auto-ignition point
C threshold limit value (TLV)
D lower explosive limit (LEL)
AI Explanation

The correct answer is D) lower explosive limit (LEL). The lower explosive limit (LEL) is the minimum concentration of a vapor in air that can form an explosive mixture. This is a critical safety consideration for the operation of vessels, as exceeding the LEL can lead to the risk of explosions or fires. The LEL is defined by regulations and industry standards to help ensure safe operations. The other options are incorrect because they do not directly refer to the minimum explosive concentration. The flash point and auto-ignition point are related to the ignition of the vapor, while the threshold limit value (TLV) refers to the maximum safe exposure limit for personnel, not the explosive range.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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