G2 Gas Fitter Practice Exam

What is the primary purpose of a burner in a forced air system?

1. To provide heat

2. To mix the air and gas

3. To increase pressure

4. To filter impurities

The correct answer is: To mix the air and gas

The primary purpose of a burner in a forced air system is to provide heat. Burners are designed to ignite fuel and produce a flame, which generates the necessary heat that is then transferred to the air passing through the system. This heated air is circulated throughout the space to maintain comfortable temperatures. While mixing air and gas is a critical function of the burner, enabling efficient combustion and optimizing heat output, the most direct role of the burner in the context of a forced air system is to provide heat. The other options do not appropriately address the primary function of a burner in this setup. Burners do not primarily increase pressure; rather, they create a combustion reaction. Filter impurities is not a function of a burner, but rather pertains to other components that ensure clean air or gas is fed into the system. Thus, while mixing air and gas is part of the combustion process, the essential purpose is heat generation.