In a fire warning system, what mechanical fault could lead to false alarms?

• A. Overheating of the detector element
• B. Moisture ingress causing corrosion
• C. Kinks in the sensing element
• D. Surface dust accumulation only

Answer: (C)

A false alarm can be caused by a mechanical fault that distorts how the sensing element responds. A bend or kink in the sensing element changes its geometry, which alters its readings—for example, by changing electrical resistance, heat transfer, or the optical path. That altered response can mimic the signal of a fire, triggering an alarm even when there is no fire. Other issues described are more about environmental effects or component degradation than a direct mechanical distortion of the sensor, so they’re less likely to produce a false alarm in this context. Regular inspection should ensure the sensing element is free from bends or kinks to prevent nuisance alarms.