NCIDQ IDFX Practice Exam

What triggers a rise-of-temperature detector to activate an alarm?

1. Presence of smoke

2. Rapid increase in CO2 levels

3. Specific temperature threshold

4. Water accumulation

The correct answer is: Specific temperature threshold

The activation of a rise-of-temperature detector is specifically linked to reaching a predetermined temperature threshold. These detectors are designed to monitor the ambient temperature of an environment and will trigger an alarm when the temperature exceeds the set limit, indicating a potential fire condition. This is based on the principle that fires typically result in rapid increases in temperature, and the detector is calibrated to respond to such changes. While the presence of smoke or other signs of a fire are often indicators that a situation may be dangerous, they don’t directly cause a rise-of-temperature detector to activate. Similarly, a rapid increase in CO2 levels may suggest combustion or a fire is occurring, but it is not the functional basis for how temperature detectors operate. Water accumulation, while potentially hazardous in other contexts, does not play a role in the activation of temperature threshold detectors.