What is the application for a temperature measuring device known as a thermocouple pyrometer?

Correct Answer: Option C — Extremely high temperature applications such as boiler or engine exhaust temperatures.

Thermocouple pyrometers operate on the Seebeck effect, generating a voltage proportional to temperature differences at a junction of dissimilar metals. This technology is specifically suited for measuring extremely high temperatures, such as diesel engine exhaust gases or boiler furnace temperatures, where traditional liquid-in-glass or bimetallic sensors would fail.