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Which one of these is not one of the three operating principles used in gas-sensing fire detectors or multisensory detectors?

A. Heat
B. Smoke
C. Flame
D. Radiation

Answer :

Final answer:

The radiation is not considered as one of the key operating principles that are used in gas-sensing fire detectors or multisensory detectors.

The answer is D

Explanation:

In the context of fire detection, the three principles that are typically recognized are heat detection, smoke detection, and flame detection. Therefore, Radiation is not considered one of the key operating principles.

Let's briefly break down each choice:

  • Heat: Fire detectors sense an increase in temperature as would occur in the event of a fire.
  • Smoke: Smoke detectors recognize particles produced by a fire entering the detection chamber.
  • Flame: Flame detectors work by detecting the ultraviolet or infrared radiation emitted by fire.
  • Radiation: Although fires do emit radiation (specifically infrared), fire detectors commonly do not have a separate radiation detection principle.
  • The infrared radiation sensitivity of the skin mentioned in the figures, while interesting, doesn't directly contribute to the operating principles of gas-sensing fire detectors or multisensory detectors.

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