What two fuel adjustments can be made to a turbojet engine?

In a turbojet engine, the two fuel adjustments that can significantly impact engine performance are related to max RPM and idle RPM. Adjusting the fuel flow at different operating conditions allows for better control of engine thrust and efficiency.

At idle RPM, where the engine operates at a lower speed, fine-tuning the fuel flow ensures that there is enough thrust to keep the engine running smoothly without causing it to stall. Conversely, at maximum RPM, increasing the fuel flow is essential to achieving maximum thrust. This adjustment allows the engine to respond to the increasing demand for power during takeoff and acceleration.

Other options do not accurately represent the adjustments made to turbojet engines. For instance, throttle position alone does not directly modify the fuel flow; rather, it alters airflow and indirectly influences fuel flow based on existing engine parameters. Fuel density, while important for overall fuel composition, does not represent a direct adjustment scenario but rather a characteristic of the fuel being used. Lastly, while compressor speed is crucial for overall engine performance, it is not a direct fuel adjustment but rather a result of the operational parameters of the engine.