FAA Powerplant Written Practice Test

Which two engine parameters are essential for computing takeoff power in a turboprop engine?

1. Tachometer and EGT

2. Torque meter pressure and EGT

3. Fuel flow and N1

4. RPM and manifold pressure

The correct answer is: Torque meter pressure and EGT

To compute takeoff power in a turboprop engine, it's essential to monitor both the torque output and the exhaust gas temperature (EGT). The torque meter provides a direct measurement of the engine's thrust-producing capability at takeoff, which is critical for assessing whether the engine can deliver the required power for a safe and efficient takeoff. Meanwhile, EGT serves as an important parameter for ensuring that the engine operates within its thermal limits during high-power operations. High exhaust gas temperatures can indicate that the engine is pushing against its performance boundaries, which could lead to potential damage or failure if not managed properly. Combining these two parameters allows for a comprehensive assessment of the engine’s performance and limits during critical phases of flight, such as takeoff. This understanding is crucial for pilots and engineers to ensure safety and performance in turboprop operations, particularly under varying load conditions and environmental factors.