FAA Powerplant Written Practice Test

What is a common feature of turbofan engine inlets?

1. They are designed for fuel efficiency.

2. They contain sound-reducing materials.

3. They increase thrust at low speeds.

4. They enhance fuel combustion.

The correct answer is: They contain sound-reducing materials.

A common feature of turbofan engine inlets is that they contain sound-reducing materials. This design characteristic is particularly important for meeting strict noise regulations at airports and for enhancing the comfort of passengers onboard. The materials and configurations used in the inlet help to mitigate the noise generated by the engine, especially during takeoff and landing phases. While turbofan inlets are designed with various considerations in mind, such as aerodynamics and efficiency, the emphasis on noise reduction is a key aspect of modern aircraft design, reflecting the industry's commitment to environmental concerns and regulatory compliance. Each of the other options reflects benefits associated with turbofan engines, but they do not specifically characterize the design feature of the inlets in the same way that noise reduction does.