AMP - Aviation Maintenance Technician Powerplant Practice Exam

The main difference between turbojet and turbofan engines in terms of thrust production lies in the design and function of the engines, particularly the additional fan present in turbofans. Turbofan engines incorporate a large fan at the front of the engine that draws in a significant amount of air. This fan not only contributes to the thrust produced by the engine but also pushes a substantial volume of air, which enhances efficiency and allows for quieter operation compared to turbojets.

In turbojets, thrust is generated entirely by the high-speed exhaust gases produced from combustion. Therefore, turbojets generally have a more limited thrust production mechanism since they rely solely on the acceleration of exhaust gases, which is less efficient at lower speeds compared to the combined thrust mechanism of turbofans.

The added fan in turbofans provides extra thrust without requiring additional fuel in the same proportion, making turbofans more efficient, especially during lower-speed operations and takeoffs. This design feature allows turbofans to achieve better overall thrust-to-weight ratios and improved fuel efficiency in commercial aviation applications.

Other options do not accurately represent the differences between these two types of engines: turbofans do produce noise, they do not rely solely on internal combustion given the function of the fan, and contrary