Which item is not part of the core engine or gas generator?

• A. Inlet
• B. Compressor
• C. Propelling nozzle
• D. Exhaust

Answer: (C)

In a gas turbine, the core engine (gas generator) consists of the parts that actually generate energy: the compressor, the combustor, and the turbine. The air inlet and the exhaust path are part of the overall engine flow path, but they do not contribute to energy generation themselves.

The propelling nozzle is where the energy already produced is converted into thrust by expanding the hot gases. It sits downstream of the turbine and does not participate in compression, combustion, or energy extraction. Since its purpose is thrust generation rather than energy production, it isn’t part of the core gas generator.