Which of the following is NOT a gas turbine configuration?

• A. Turbocharger
• B. Turbojet
• C. Turbofan
• D. Turboprop

Answer: (A)

Gas turbine configurations describe complete propulsion or power-creation architectures that use a gas turbine core to deliver thrust or shaft power. A turbocharger is not such a configuration. It’s a turbine-driven compressor attached to a piston engine to force more air into the cylinders, using exhaust energy to spin the compressor and boost power. It doesn’t form its own propulsion cycle. The turbojet, turbofan, and turboprop are all self-contained gas-turbine propulsion setups: turbojet produces thrust from hot exhaust after the core, turbofan adds a large bypass airflow for additional thrust, and turboprop uses the turbine to drive a propeller through a reduction gear. So the turbocharger isn’t a gas-turbine propulsion configuration.