FAA Powerplant Written Practice Test

What is the role of the flow divider in a turbine engine duplex fuel nozzle system?

1. To create primary and secondary fuel supplies

2. To regulate fuel pressure

3. To filter fuel impurities

4. To monitor fuel temperature

The correct answer is: To create primary and secondary fuel supplies

The flow divider in a turbine engine duplex fuel nozzle system serves the important function of creating primary and secondary fuel supplies. This separation of fuel flow is essential for ensuring that the fuel is atomized effectively as it enters the combustion chamber. By dividing the fuel flow, the system can achieve more precise control over the fuel-air mixture, which leads to better combustion efficiency and improved engine performance. In a duplex nozzle system, the flow divider allows for different rates of fuel flow to each of the nozzle's injectors, optimizing the mixing of the fuel with air. This configuration enhances the overall combustion process, especially during varying operational conditions. By fostering an ideal air-fuel ratio, the flow divider contributes to more stable engine operation and reduces the likelihood of issues like flameouts or excessive emissions. While regulating fuel pressure, filtering fuel impurities, and monitoring fuel temperature are all crucial aspects of fuel system functionality, these roles are handled by other components within the engine's fuel system. The flow divider is specifically focused on managing the distribution of fuel flow to achieve the desired conditions for combustion.