FAA Powerplant Written Practice Test

Which instrument is used to monitor the mechanical integrity of turbines and check operating conditions of a turbine engine?

1. Oil pressure gauge

2. Exhaust gas temperature (EGT)

3. Fuel flow meter

4. Tachometer

The correct answer is: Exhaust gas temperature (EGT)

The exhaust gas temperature (EGT) instrument is crucial for monitoring the mechanical integrity and performance of a turbine engine. It provides valuable information about the temperature of the gases exiting the turbine section of the engine. By analyzing EGT readings, engineers can assess the overall health of the engine, as fluctuations or abnormal readings may indicate potential issues, such as problems with the combustion process or abnormal wear on components. EGT is especially critical during various phases of engine operation, including takeoff, cruise, and landing. High EGT values can suggest excessive fuel flow, inefficient combustion, or malfunctioning components, while low values may indicate insufficient fuel delivery or air intake problems. By keeping EGT within its recommended limits, operators can ensure that the turbine is functioning correctly and avoid damage that could arise from overheating or operating outside safe parameters. Other instruments, like the oil pressure gauge, fuel flow meter, and tachometer, provide important information as well but focus on different aspects of engine performance. The oil pressure gauge measures lubrication system performance, the fuel flow meter indicates fuel delivery rates, and the tachometer tracks engine revolutions. While all these instruments contribute to a comprehensive understanding of engine health, the EGT specifically provides direct insight into combustion efficiency and the thermal state of