G2 Gas Fitter Practice Exam

A bunsen-type flame is identified by which appearance?

1. A yellow flame

2. A blue flame

3. A green flame

4. A red flame

The correct answer is: A blue flame

A bunsen-type flame is identified by its blue appearance. This blue flame indicates complete combustion of gas, which produces a higher temperature flame and is more efficient for heating purposes. The presence of a blue flame shows that there is an adequate supply of oxygen, allowing for the efficient burning of fuel. In contrast, other colored flames, such as yellow or red, typically signify incomplete combustion, which is less efficient and may produce soot or other undesirable byproducts. Therefore, the blue flame is characteristic of the optimal operation of a bunsen burner, making it the correct choice in identifying this type of flame.