FDNY P-99 Low PSI Oil Burner Operator Practice Test 2025 – Complete Exam Prep

Question: 1 / 400

If the oil spray mixture contacts the walls of the combustion chamber, what can occur?

Increase combustion efficiency

Produces a smoky fire

When the oil spray mixture contacts the walls of the combustion chamber, it can lead to incomplete combustion. This is primarily because the walls may cool the oil droplets that come into contact with them, preventing those droplets from vaporizing properly. When oil does not vaporize completely, it combusts less efficiently, which results in the production of soot and unburned hydrocarbons. The accumulation of these byproducts creates a smoky fire.

In a properly functioning oil burner, the oil should be atomized and mixed well with air to ensure complete combustion. If there is a failure in this process, such as improper atomization or the mixture hitting cooler surfaces, it disrupts the ideal conditions for combustion. This not only produces smoke but may also lead to other issues, such as reduced heat output and increased emissions, which can impact the overall efficiency of the burner system.

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Enhances flame color

Reduces smoke output

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