FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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A thermocouple in a fire detection system triggers the warning system because it

  1. Detects smoke particles

  2. Generates a small current when heated

  3. Changes color with temperature

  4. Expands with heat

The correct answer is: Generates a small current when heated

The correct answer is B. A thermocouple in a fire detection system triggers the warning system because it generates a small current when heated. Thermocouples are temperature sensors that work based on the principle that when two dissimilar metals are joined together, a voltage is created that is proportional to the temperature difference between the hot junction (where the thermocouple is exposed to heat) and the cold junction. When a fire heats the thermocouple, it generates a small current due to the temperature difference, which then triggers the warning system to alert of a potential fire hazard. Options A, C, and D are incorrect because a thermocouple does not detect smoke particles, change color with temperature, or expand with heat.

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