FAA Powerplant Written Practice Test

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

1. Regulates engine temperature

2. Creates the primary and secondary fuel supplies

3. Monitors fuel flow rates

4. Increases fuel pressure

The correct answer is: Creates the primary and secondary fuel supplies

The main function of the flow divider in a turbine engine duplex fuel nozzle system is to create the primary and secondary fuel supplies. In a duplex fuel nozzle, there are typically two fuel passages that allow for improved atomization and more efficient combustion. The flow divider ensures that fuel is directed appropriately between these passages under varying engine operating conditions. This division of fuel flow is crucial because it allows for a finer control over fuel delivery, thus optimizing the combustion process. The primary fuel supply is generally provided for low power settings or initial engine start-up, while the secondary supply kicks in as power demands increase. This design helps maintain efficiency and performance across a range of operating conditions by ensuring that the nozzle can adapt to the varying needs of the engine. The other functions, such as regulating engine temperature, monitoring fuel flow rates, or increasing fuel pressure, are managed by different components of the fuel system. Each plays its own role, but the unique purpose of the flow divider specifically centers on the distribution of fuel between the nozzle's passages.