G2 Gas Fitter Practice Exam 2025 - Free Gas Fitter Practice Questions and Study Guide

Question: 1 / 400

What could result if a flame is adjusted with too much primary air?

Flame lift

When a flame is adjusted with too much primary air, it can lead to a phenomenon known as flame lift. This occurs because the increased air supply alters the combustion dynamics by making the mixture leaner. When the air-to-fuel ratio is not optimal, the flame may become unstable and detach from the burner, resulting in the flame being lifted off the burner surface. This can cause the flame to move away from its intended position, which is not only inefficient but can also pose safety risks.

Other potential consequences of adjusting to an improper air-to-fuel ratio, such as blowout, decreased efficiency, and higher emissions, can happen in different circumstances or due to other operational issues, but in the specific context of using excessive primary air, flame lift is the most direct and immediate consequence.

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Flame blowout

Decreased efficiency

Higher emissions

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