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← ScienceWhich risk increases when a bimetallic strip is used in a fire alarm and overheats?
A)False alarm due to thermal expansion✓
B)Sensor failure from material fatigue
C)Delayed response from thermal lag
D)Increased accuracy from high sensitivity
💡 Explanation
When a bimetallic strip overheats, differential thermal expansion occurs because the two metals have different coefficients, causing the strip to bend excessively and trigger the alarm prematurely. Therefore a false alarm results, rather than fatigue, delay or accuracy, which require different conditions.
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