FAA AMT (Aviation Maintenance Technician) Airframe Practice Exam

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How are the thermal switches of a bimetallic thermal switch type fire detection system connected?

In series with each other and parallel with the indicator lights.

In parallel with each other and in series with the indicator lights.

A bimetallic thermal switch type fire detection system works by using multiple thermal switches connected in parallel with each other and in series with the indicator lights. This allows for one or more of the switches to be triggered by the increase in temperature caused by a fire, while still keeping the circuit closed and the indicator lights on. Options A, C, and D are incorrect as they do not correctly describe the correct series and parallel connections needed for the system to function properly.

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All in series.

All in parallel.

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