What type of temperature transmitter would be most suitable for measuring diesel engine exhaust and boiler stack temperatures and generates its own electromotive force?

Correct Answer: Option D — Thermocouple pyrometer

Thermocouples operate on the Seebeck effect, where two dissimilar metals joined at a junction generate a measurable electromotive force proportional to temperature. This self-generating characteristic makes them robust and suitable for high-temperature applications like diesel exhaust and boiler stacks, where external power is not required at the sensor.