Which component in the fire detection system is described as optic detectors?

• A. Optic detectors
• B. Inconel loop
• C. Photoelectric cell devices
• D. Helium

Answer: (A)

Optic detectors are sensing elements that detect fire by using light or radiant energy. In a fire detection system, this type of detector relies on optical principles to notice smoke or flame through light transmission or scattering. The option that literally names this category—optic detectors—fits the description you’re being asked about, making it the best choice because it directly identifies the sensor type that operates via optics.

The other components aren’t light-based detectors: the Inconel loop is a metallic sensing element used for other methods of detection (not optical), and helium is a gas, not a sensor. Photoelectric cell devices are indeed optical detectors, but they’re a specific implementation of the broader optic-detector concept, whereas the term optic detectors is the descriptor in the question.