HKIE Professional Assessment - Gas Discipline Practice Questions - HKIE Professional Assessment - Gas Discipline (Hong Kong Institution Of Engineers) Exam

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What are the approximate Lower Flammable Limit (LFL) and Upper Flammable Limit (UFL) of Methane (CH4) in air by volume at standard conditions?

LFL = 5%, UFL = 15% LFL = 2.1%, UFL = 9.5% LFL = 1.8%, UFL = 8.4% LFL = 12.5%, UFL = 74%

Correct Answer:

LFL = 5%, UFL = 15%

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