Question id 341 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Compressor and turbine on individual shafts.
Compressor driving a turbine via a reduction gear.
Compressor and turbine mounted on a common shaft.
Turbine driving a compressor via a reduction gear.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license