AFJROTC Commercial and General Aviation Take Off Practice Exam

Which type of jet propulsion connects the engine to a propeller?

1. Turbojet

2. Turbocharged

3. Turbofan

4. Turboprop

The correct answer is: Turboprop

The type of jet propulsion that connects the engine to a propeller is known as a turboprop. In turboprop engines, the gas turbine engine drives a propeller, allowing for efficient propulsion at lower speeds compared to turbojets or turbofans. This system works by using a turbine to generate the necessary power to turn the propeller, making it particularly well-suited for shorter flights and regional aircraft where efficient fuel consumption and effective takeoff and landing performance are important. Turboprop engines combine the benefits of both jet propulsion and traditional propeller systems, maximizing efficiency for specific flight profiles. They are commonly found in smaller commercial aircraft and military transport planes where short takeoff distances and better performance at lower altitudes are advantageous. In contrast, turbojet engines expel exhaust gases at high speed for thrust but do not drive a propeller, turbofans use a fan to increase thrust while also compressing air into the engine core, and turbocharged refers to an internal combustion engine enhanced by a turbine-driven forced induction system rather than a direct connection to a propeller. Thus, turboprop remains the clear answer as it directly relates to the engine-propeller connection.