IFE Level 4 Fire Engineering Science Practice Questions - IFE Level 4 Certificate In Fire Engineering Science Exam

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If a fuel gas has a Lower Flammable Limit (LFL) of 4% and an Upper Flammable Limit (UFL) of 15% in air, which of the following concentration mixtures is too rich to support flame propagation?

2.5% 8.0% 12.5% 18.0%

Correct Answer:

18.0%

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