G2 Gas Fitter Practice Exam

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Prepare for the G2 Gas Fitter Test. Study using flashcards and multiple choice questions, with hints and detailed explanations for each question. Ensure your success!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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In a natural gas and air mixture, what are the approximate lower and upper limits of flammability?

1-5%
4-14%
10-20%
15-25%

The correct answer is: 4-14%

The correct choice identifies that the lower and upper limits of flammability for a natural gas and air mixture are approximately 4-14%. Understanding flammability limits is crucial in ensuring safety when working with natural gas, as it indicates the concentration range within which the mixture can ignite and support combustion. The lower flammability limit (LFL) indicates the minimum concentration of gas in the air that is required to support combustion, which is around 4% for natural gas. This means that if the concentration of natural gas falls below this level, it is too lean to ignite. Conversely, the upper flammability limit (UFL) signifies the maximum concentration, which for natural gas is around 14%. Concentrations above this limit are too rich to ignite effectively. Knowledge of these limits helps in assessing risks when handling natural gas and forming protocols for safe operation, maintenance, and emergency responses in environments where gas might accumulate. The other options do not accurately reflect the known concentration ranges for natural gas and air mixtures.