Texas Fire Alarm License Practice Test

What is the primary function of a smoke detector?

1. A device that prevents fire outbreaks

2. A device that detects both visible and invisible combustion particles

3. A device that measures temperature changes

4. A device that activates sprinklers

The correct answer is: A device that detects both visible and invisible combustion particles

The primary function of a smoke detector is to identify the presence of smoke, which can indicate a fire. It does this by detecting combustion particles in the air. Smoke detectors generally work by sensing either visible particles, which are often produced by larger flames, or invisible particles that are present in the smoke produced by smoldering materials. This capability allows the device to provide an early warning of a potential fire, enabling occupants to take safety precautions and evacuate if necessary. This choice highlights the essential role of smoke detectors in fire safety by monitoring specific indicators of combustion. While other devices play roles in fire prevention or suppression, the smoke detector's unique capacity to detect combustible particles directly relates to its primary function.