The _____________ ___________ turbine drives the compressor.

• A. Power turbine
• B. Gas generator
• C. Turbine shaft
• D. Auxiliary turbine

Answer: (B)

In a gas turbine engine, the compressor is driven by a turbine that is part of the gas generator section. The gas generator turbine uses energy from the hot gases produced after combustion to turn the compressor, providing the needed air pressure for continuous operation. The power turbine, by contrast, drives a load such as a propeller or an external generator, and is not what turns the compressor. The turbine shaft is the rotating shaft, not its own turbine, and an auxiliary turbine serves other, non-compressor tasks. So, the turbine that drives the compressor is the gas generator turbine.