Which type of temperature sensing system is typically used for measuring turbine engine exhaust gas temperature?

The correct choice, which is the thermocouple-type system, is widely employed for measuring turbine engine exhaust gas temperature due to its ability to withstand the extreme conditions found in such an environment. Thermocouples are made from two different metal wires joined at one end, creating a junction that generates a small voltage that is proportional to the temperature difference between the junction and the other ends of the wires. This voltage can be accurately measured and converted to a temperature reading.

In the context of turbine engines, exhaust gas temperatures can be extremely high, often exceeding the capabilities of other temperature sensing methods. Thermocouples can handle these elevated temperatures without damage and provide rapid response times, making them ideal for real-time monitoring of engine performance.

Other options, while relevant in various applications, do not offer the same reliability or suitability for high-temperature environments. For example, RTD systems utilize resistive elements and are not designed to operate at the same extreme temperatures as thermocouples. Similarly, negative temperature coefficient (NTC) systems rely on the behavior of certain semiconductors at lower temperatures and vary further from the necessary durability and responsiveness needed in turbine engines. Thermal expansion systems, which operate based on material expansion with heat, are less precise and are