Rate of flammability C3H8

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Prepare for the 3rd Year Electrical Trades Qualification (TQ) exam. Use flashcards and multiple choice questions to master the material. Each question comes with hints and explanations to help you succeed. Get set for your qualification!

Multiple Choice

Rate of flammability C3H8

Explanation:
Propane has a flammable vapor range in air defined by its lower and upper flammable limits. Below about 2% in air the mixture is too lean to ignite, and above about 10% it’s too rich to support combustion. Between roughly 2% and 10% propane in air, ignition is possible. Therefore, the flammability range is about 2-10%, which is why that option is the best fit (LFL ≈ 2.1%, UFL ≈ 9.5%). Other ranges either miss the lower limit or the upper limit, so they don’t match the actual propellant limits.

Propane has a flammable vapor range in air defined by its lower and upper flammable limits. Below about 2% in air the mixture is too lean to ignite, and above about 10% it’s too rich to support combustion. Between roughly 2% and 10% propane in air, ignition is possible. Therefore, the flammability range is about 2-10%, which is why that option is the best fit (LFL ≈ 2.1%, UFL ≈ 9.5%). Other ranges either miss the lower limit or the upper limit, so they don’t match the actual propellant limits.

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