FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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Prepare for the FAA AMT Airframe Exam with our comprehensive quiz. Featuring flashcards and multiple choice questions, each with hints and explanations to enhance your learning experience. Get ready to pass your exam with confidence!

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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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