FAA Powerplant Written Practice Test

Which component is essential for providing the necessary pressure for combustion in a gas turbine engine?

1. Exhaust system

2. Compressor

3. Turbine

4. Fuel injector

The correct answer is: Compressor

The compressor is a critical component in a gas turbine engine as it is responsible for increasing the pressure of the incoming air before it enters the combustion chamber. This process is essential for effective combustion because higher pressure allows for more air to mix with fuel, resulting in a more efficient and complete combustion process. The increased density of the air coming from the compressor also ensures that there is an optimal air-fuel ratio, which is vital for achieving the required power output and performance of the engine. In addition, as the air flows through the compressor, its temperature rises, which further contributes to the efficiency of the combustion process. Without the compressor functioning properly, the engine would not be able to sustain the necessary pressure for combustion, leading to poor performance and possible engine failure. Thus, the compressor plays an indispensable role in the operation of a gas turbine engine.