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!

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What are the major constituents of flue gases from natural gas combustion?

CO2, H2, CO, and N2
CO2, H2O, N2, O2, and heat
H2, O2, N2, and NOx
CO, O2, N2, and unburned hydrocarbons

The correct answer is: CO2, H2O, N2, O2, and heat

The major constituents of flue gases from natural gas combustion primarily include carbon dioxide (CO2), water vapor (H2O), nitrogen (N2), oxygen (O2), and heat. When natural gas, which is primarily methane (CH4), burns in an oxygen-rich environment, it produces CO2 and H2O as the main byproducts of combustion. In addition to these, there is typically nitrogen present because it composes about 78% of the Earth's atmosphere. During combustion, some oxygen may remain unutilized, which is accounted for in the flue gases as well. The heat generated from the combustion process is also a critical aspect, contributing to the energy output of the system. This comprehensive understanding of the composition of flue gases is essential for gas fitters, as it affects everything from system design to environmental considerations, ensuring efficiency and compliance with regulations. The other choices contain elements that either do not form major constituents during the combustion of natural gas or mix gases that are not standard byproducts in typical combustion scenarios.