FAA Powerplant Written Practice Test

Which of the following best represents the function of an absolute pressure controller?

1. Regulates fuel injection rates

2. Manages engine exhaust temperatures

3. Controls turbocharger pressure and function

4. Monitors flight speed

The correct answer is: Controls turbocharger pressure and function

The function of an absolute pressure controller is best represented by its role in controlling turbocharger pressure and function. Turbochargers are used to increase the engine's efficiency and power output by forcing more air into the combustion chamber. The absolute pressure controller continuously monitors the pressure within the turbocharger system and adjusts the wastegate position or the turbocharger’s operation to ensure optimal pressure levels are maintained. This helps maintain the engine's performance across various operating conditions, allowing for efficient air-fuel mixture and combustion processes. While the management of fuel injection rates, engine exhaust temperatures, and monitoring flight speed are all important aspects of engine operation and performance, they are not the primary functions of an absolute pressure controller. Instead, those tasks are typically handled by other systems designed specifically for fuel management, exhaust management, and airspeed measurement.