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Which of the following is an incorrect characteristic of a smoke-activated detector?

Which of the following is an incorrect characteristic of a smoke-activated detector?

PrepAway - Latest Free Exam Questions & Answers

A.
Can be used to sound a warning alarm before the suppression system activates

B.
Can be configured to sound an alarm either when a predefined temperature is reached or when the temperature increases over a period of time

C.
A photoelectric device is an example of a smoke-activated detector

D.
Good for early-warning devices

Explanation:
Smoke-activated detectors are good for early-warning devices. They
can be used to sound a warning alarm before the suppression system activates. A
photoelectric device, also referred to as an optical detector, detects the variation
in light intensity. The detector produces a beam of light across a protected area,
and if the beam is obstructed, the alarm sounds. Heat-activated detectors can be
configured to sound an alarm either when a predefined temperature (fixed
temperature) is reached or when the temperature increases over a period of time
(rate-of-rise).


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