G2 Gas Fitter Practice Exam

Which type of burner would normally have the hottest flame?

1. Atmospheric burner

2. Mechanical air premix

3. Raw gas nozzle mix

4. Forced draught burner

The correct answer is: Mechanical air premix

The mechanical air premix burner typically produces the hottest flame due to its design, which allows for a precise mixture of air and gas before combustion occurs. This type of burner uses a fan or blower to mix the gas with the appropriate amount of air, resulting in a more complete combustion and higher flame temperatures. By ensuring that the gas is adequately mixed with air, the combustion process is optimized, significantly increasing the efficiency of the burner. Therefore, the flame produced by a mechanical air premix burner can reach higher temperatures compared to other types of burners, which may not achieve the same level of air-gas mixing or combustion efficiency. Overall, the design and operational principles of the mechanical air premix burner contribute to its capability of achieving higher flame temperatures, making it the ideal choice for applications requiring intense heat.