Which statement describes the role of the duplex nozzle in turbine engines?

• A. Provides primary and secondary fuel flow to dual-line duplex nozzles
• B. Provides single line fuel flow
• C. Reduces air intake
• D. Controls ignition timing

Answer: (A)

Duplex nozzle systems are designed to deliver two separate fuel streams to the combustion area, enabling primary and secondary fuel flow to dual-line injectors. This dual-feed arrangement lets the engine meter fuel differently for ignition and main combustion, helping atomization and flame stability across a wide range of operating conditions. The other ideas don’t fit because one fuel line doesn’t support both feeds, and the nozzle isn’t responsible for reducing air intake or dictating ignition timing—the inlet and ignition system handle those aspects.