Which component in a turbine engine is designed to produce two spray patterns?

• A. Throttle body
• B. Fuel pump
• C. Duplex fuel nozzle
• D. Combustion chamber liner

Answer: (C)

In a turbine engine, fuel is atomized and mixed with air inside the combustion chamber by the fuel nozzle. The component designed to produce two spray patterns is the duplex fuel nozzle. It provides two distinct spray modes—typically a main spray and a pilot (or secondary) spray—through separate passages or nozzles. This dual pattern enhances atomization and air-fuel mixing, improving ignition, flame stability, and combustion efficiency across operating conditions. The throttle body simply controls air flow, the fuel pump delivers fuel pressure, and the combustion chamber liner is the wall of the chamber, not a spray device.