What are the two basic types of turbine engine fuel control units?

The two basic types of turbine engine fuel control units are hydro-mechanical and electronic. Hydro-mechanical fuel control units utilize mechanical components along with hydraulic principles to regulate the flow of fuel into the engine based on various parameters, such as engine speed and pressure. This type of control system is often characterized by its reliability and simplicity, as it does not rely on electrical components.

On the other hand, electronic fuel control units use sophisticated electronic systems to manage fuel flow. These units are capable of processing a wider array of input parameters and can adjust fuel delivery with greater precision. The electronic systems often incorporate sensors that provide real-time data to optimize performance, fuel efficiency, and emissions.

The other options, chemical and manual, do not accurately represent types of fuel control units found in turbine engines. Chemical suggests a process or method unrelated to the mechanical or electronic regulation of fuel, while manual implies a level of control by human operators rather than an integrated control system within the engine. Therefore, the recognized classifications of turbine engine fuel control units focus on the hydro-mechanical and electronic systems.