G2 Gas Fitter Practice Exam

Which flame characteristic is typically found with a nozzle mix burner?

1. Short and loud flame

2. Long, quiet, low flame temperature

3. Very bright blue flame

4. Rapid flickering flame

The correct answer is: Long, quiet, low flame temperature

The characteristic of a long, quiet, low flame temperature is typically associated with a nozzle mix burner. This type of burner operates by mixing fuel and air in the nozzle before they exit and ignite, creating an efficient combustion process. The design allows for controlled combustion, resulting in a longer and more stable flame. The "quiet" aspect stems from the efficient mixing and combustion process, which minimizes turbulence and the sound produced. Additionally, the lower flame temperature is a result of the effective air-fuel mixing that leads to a more efficient burning process, often producing less heat than other types of burners that operate with excess fuel. In contrast, a short and loud flame usually indicates incomplete combustion or a different burner design, while a very bright blue flame suggests high efficiency typically associated with complete combustion rather than the characteristics of a nozzle mix burner. A rapid flickering flame might indicate instability in the combustion process or inconsistent fuel supply, which also wouldn't be typical of a well-functioning nozzle mix burner.