Which of the following types of fire detectors uses rateofri

Which of the following types of fire detectors uses rate-of-rise sensors?

A. Flame activated

B. Heat activated

C. Smoke activated

D. Ion activated

Solution

B. Heat-activated sensors can be either rate-of-rise or fixed-temperature sensors. Answer A is incorrect because flame-activated sensors respond to the infrared energy that emanates from a fire. Answer C is incorrect because smoke-activated sensors use a photoelectric device. Answer D is incorrect because there is no category of fire detector known as ion activated.