What is a characteristic of turbofan engines at higher thrust settings?

A characteristic of turbofan engines at higher thrust settings is that they produce more noise compared to turboprop engines. This is primarily due to the larger fan and higher overall flow rates of air through the engine, which leads to increased noise levels during operation, especially at takeoff and climb phases when thrust is maximized.

In comparison, turboprop engines typically produce less noise for similar power outputs because they operate on a different principle, using a propeller that generates noise in a different frequency range and at a lower overall volume.

The other characteristics mentioned, such as longer spool-up times, maintaining thrust despite atmospheric changes, and fuel consumption comparisons, are less representative of typical turbofan performance. Turbofans generally have a faster response time to throttle changes than turboprops, can experience variations in thrust with atmospheric changes, and while they can be more fuel-efficient at cruise than some other engine types, this efficiency parameter can vary widely depending on operational conditions and specific engine design.