Question id 219 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Clear the burnt gases, the expansion of which provide the thrust.
Compress the air in order to provide a better charge of the combustion chamber.
Drive the compressor by using part of the energy from the exhaust gases.
Drive devices like pumps, regulator, generator.

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