Technical Standards and Safety Authority (TSSA) G3 Practice Exam

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Prepare for the TSSA G3 Exam. Study with quizzes, flashcards, and multiple-choice questions. Each provides valuable hints and detailed explanations to ensure readiness for your exam!

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What is the minimum amount of air required for complete combustion to burn 1 cubic foot of natural gas?

  1. 5.0 ft3 (0.14 m3)

  2. 10.0 ft3 (0.28 m3)

  3. 12.0 ft3 (0.34 m3)

  4. 25.0 ft3 (0.71 m3)

The correct answer is: 10.0 ft3 (0.28 m3)

To determine the minimum amount of air required for the complete combustion of natural gas, it is essential to understand the stoichiometry of combustion. For natural gas, which is primarily methane (CH₄), the stoichiometric equation indicates that complete combustion requires a specific ratio of air to gas. For every cubic foot of natural gas, approximately 10 cubic feet of air are needed to achieve complete combustion. This includes the oxygen content of air, which is necessary to oxidize the methane into carbon dioxide and water. The correct answer reflects this stoichiometric need for air: it shows that 10.0 cubic feet of air provide the appropriate amount of oxygen for every cubic foot of natural gas to ensure the reaction proceeds fully without the formation of carbon monoxide or unburned hydrocarbons. Considering the other options, they either significantly overestimate or underestimate the necessary air supply. The burn process needs just enough air to ensure that all the combustible gas is utilized efficiently, making the understanding of the correct air-to-fuel ratio vital in applications involving combustion systems.