FAA Powerplant Written Practice Test

Which type of fuel control is predominantly found in modern turbine engines?

1. A Manual hydraulic control

2. B Hydro mechanical or electrical

3. C Pneumatic control

4. D Analog fuel control

The correct answer is: B Hydro mechanical or electrical

The predominant type of fuel control found in modern turbine engines is hydro-mechanical or electrical control. This choice reflects the advancements in fuel control systems that have improved performance, efficiency, and reliability. Hydro-mechanical fuel control systems utilize a combination of mechanical components and hydraulic pressure to manage fuel flow based on various engine parameters, such as thrust demand and environmental conditions. These systems allow for precise control of fuel delivery, which is essential for maintaining optimal engine performance and efficiency. Electrical fuel control systems, often integrated with engine electronic control units (ECUs), further enhance the precision and responsiveness of fuel management. By using electronic signals to regulate fuel flow, these systems can adapt rapidly to changing conditions, improving both performance and fuel economy. This evolution towards hydro-mechanical or electrical control reflects the trend in aviation towards greater automation, reduced pilot workload, and enhanced engine performance. Manual hydraulic controls, pneumatic controls, and analog fuel controls lack the sophistication and adaptability of hydro-mechanical or electrical systems, which is why they are less commonly employed in contemporary turbine engine design. This shift towards advanced fuel control technologies is critical for meeting modern performance requirements and regulatory standards in aviation.