Which of the following is an advantage of the bypass fan in jet engines?

The advantage of the bypass fan in jet engines significantly contributes to reduced engine noise. Bypass fans work by directing a larger volume of air around the combustion core of the engine rather than through it. This design results in quieter operation because much of the noise generated during flight emanates from the bypass airflow, which is generally at a lower speed compared to the high-velocity exhaust from traditional turbojet engines.

As a result, aircraft equipped with high-bypass ratio engines—notably those often used in commercial aviation—tend to have a quieter cabin environment and conform to stricter noise regulations in many urban areas. The design innovations that come with bypass fans not only enhance efficiency but also facilitate a more favorable acoustic profile, making air travel more comfortable for passengers and reducing the environmental impact of noise.

In contrast, choices related to increased maximum takeoff weight, increased engine temperature, and higher operational cost do not represent advantages associated with the bypass fan and are typically considered drawbacks in various engineering contexts.