FAA Powerplant Written Practice Test

Which two engine parameters are used to compute takeoff power for a turboprop engine?

1. EGT and torque meter pressure

2. RPM and fuel flow

3. Torque meter pressure and oil temperature

4. Fuel flow and atmospheric pressure

The correct answer is: EGT and torque meter pressure

In computing takeoff power for a turboprop engine, the relevant parameters are Exhaust Gas Temperature (EGT) and torque meter pressure. EGT is critical because it reflects the engine's performance and combustion efficiency during operation. Elevated exhaust gas temperatures can indicate the engine's operational limits and performance characteristics at full power, which is crucial during takeoff when maximum thrust is needed. Torque meter pressure is essential as well because it measures the engine's output torque, which directly correlates with the power being produced. In turboprop engines, torque output is a primary factor in determining the actual power generated by the engine, especially since these engines work by turning a propeller to generate thrust. Together, these parameters provide a comprehensive picture of the engine's capability to deliver the required power during takeoff.