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Projected beam smoke detectors operate on the _____
principle. - Precise Answer ✔✔Light obscuration
A common listing for a commercial fi re alarm control unit
is _____. - Precise Answer ✔✔UL 864
An ionization smoke detector works by _____. - Precise
Answer ✔✔Sensing the products of combustion
The types of heat detectors that must be manually reset
once they have activated are _____. - Precise Answer
✔✔Fusible link and quick metal
The normal field of view for a UV or IR flame detector is
less than _____. - Precise Answer ✔✔90 degrees of vision
Automatic spot-type detectors may be mounted on
sidewalls, but not closer than _____ from the intersection
of the wall and ceiling. - Precise Answer ✔✔4 inches
, The document that formalizes the commissioning process
is _____. - Precise Answer ✔✔NFPA 3
To avoid service interruptions, a fi re alarm system may
be connected to the line side of the electrical main
service disconnect, but that circuit must be protected by
a fuse or circuit breaker no larger than _____ amps. -
Precise Answer ✔✔20
When two or more strobe lights are visible from a single
location, they must _____. - Precise Answer ✔✔Be
synchronized to fl ash together
A key-operated pull box is very likely to be found installed
in a(n) _____. - Precise Answer ✔✔Prison
Life safety fi re protection is concerned with protecting
and preserving _____. - Precise Answer ✔✔Human life
The circuit integrity of a Class B circuit is monitored via
_____. - Precise Answer ✔✔The end of line device
A sprinkler fl ow alarm must be initiated within _____
seconds of the flow of water. - Precise Answer ✔✔90