How is the air oil ratio effectively adjusted in a rotary cup burner?

• A. By altering the fuel viscosity
• B. With the setting of the metering valve and air controls
• C. Through manual ignition control
• D. By modifying the burner size

Answer: (B)

In a rotary cup burner, the air-oil ratio is primarily adjusted through the setting of the metering valve and air controls. This method allows for a precise regulation of the fuel and air that are mixed in the burner before combustion takes place. The metering valve controls the flow rate of the oil, while the air controls dictate the amount of air introduced into the system. This careful balancing of air and fuel is essential to achieve optimal combustion efficiency and maintain desired operational parameters.

Altering fuel viscosity influences how the fuel atomizes but does not directly control the air-oil mixing process. Manual ignition control is related to the starting process of the burner rather than the ongoing adjustment of the air-fuel ratio. Modifying the burner size impacts the overall capacity and the range of output but does not effectively adjust the specific ratio of air to oil within a given burner configuration. Therefore, the most effective and accurate method for managing the air-oil ratio in a rotary cup burner is by using the metering valve and air controls.