The flammable limits of Benzene are 1.4% to...

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Question 1 of 205eccef9ebacbc34ba4d465ac

The flammable limits of Benzene are 1.4% to 8% by volume in air. If a combustible gas indicator is used to sample a tank that contains a Benzene vapor/air mixture of 0.7% Benzene vapor by volume in air, which of the listed indications will be observed on the meter?

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🔍 Key Concepts

• Lower flammable limit (LFL) and upper flammable limit (UFL) and what they mean in % by volume • How combustible gas indicators usually display readings (often as a % of the LFL, not as an absolute % volume in air) • The relationship between an actual gas concentration (like 0.7%) and the stated flammable range (1.4% to 8%)

💭 Think About

• Compare the 0.7% Benzene concentration to the lower flammable limit of 1.4%. Is 0.7% below, equal to, or above the LFL? What does that imply about flame propagation? • Think about how a meter calibrated in % of LFL would respond when the actual concentration is only half of the LFL. • Consider whether a combustible gas indicator will show a strong explosive reading, no reading, or a partial reading when the sample is below the lower flammable limit.

✅ Before You Answer

• Calculate what fraction of the lower flammable limit (1.4%) the 0.7% concentration represents. • Confirm whether a combustible gas indicator typically detects and displays readings below the LFL, and if so, how (e.g., as a percentage of LFL). • Eliminate any option that would require the sample to be at or above the LFL to make sense.

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