Fire alarm system thermostats are actuated by:
Direct Answer
Option D: The difference in thermal expansion of two dissimilar metals
Thermostats used in fire alarm systems, particularly bimetallic types, operate based on the principle that two different metals expand at different rates when heated. This differential expansion causes the strip to bend, closing an electrical contact and triggering an alarm.
All Options
Detailed Explanation & Context
Thermostats used in fire alarm systems, particularly bimetallic types, operate based on the principle that two different metals expand at different rates when heated. This differential expansion causes the strip to bend, closing an electrical contact and triggering an alarm.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Fire Fighting (AFF).
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