Projected beam smoke detectors are testednot with actual smoke, but by simulating obscuration usinglisted toolssuch as atest switchoroptical filter.
NFPA 72 (2022), Section 14.4.2.2.6.2:
"Projected beam-type smoke detectors shall be tested by introducing an obscuration in the beam path using an optical density filter or a method approved by the manufacturer." Some systems includelisted test switchesfor functional checks without disrupting alignment.
Correct answer: Using a listed test switch, Using an optical filter

NFPA 72 requires theinstallation dateof batteries to be clearly marked for maintenance and service life tracking.
NFPA 72 (2022), Section 10.6.10.1.1:
"Each battery shall be marked with the month and year of installation." This helps ensure timely testing, maintenance, and replacement based on age.
Correct answer: C. Month and year of installation

This question is referring tosupervisory signaling for control valvesin sprinkler systems. When a valve begins to move from its normal (open) position, the fire alarm system must detect and signal thisbefore it reaches too far out of position.
NFPA 72 (2022), Section 17.16.1.3:
"Off-normal signal shall be initiated during the first one-quarter (1/4) of the valve travel distance from its normal position." This ensures timely detection if someone begins to close a sprinkler valve, which could disable the fire suppression system.
Correct answer: B. 1/4

Thesignal silence switchis used to silence audible signalswithout resetting the system or clearing the visual indicatorsof an alarm condition. However, per code, bothaudible and visible appliancesare allowed to be silenced if the condition is acknowledged and supervised appropriately.
NFPA 72 (2022), Section 10.11.5.2.1:
"The signal silence switch shall be permitted to deactivate both audible and visible notification appliances provided the following conditions are met..." Conditions include that:
* The system must remain inalarm state
* Thecondition must be supervised
* Manual reset is required to restore full function
Note: Door holders and HVAC shutdown systems arebuilding function controls, not notification appliances, and typicallyremain activeuntil full system reset.
Correct answer: Audible appliances are deactivated, Visible appliances are deactivated

Signal priorities determine the order in which events are processed and displayed by the fire alarm system.
NFPA 72 (2022), Annex A.10.14.3 and system programming guidelines:
While not directly listed in a table, systems are programmed such that:
* Alarm (including pre-alarm)has the highest priority
* Followed bysupervisory, thentrouble, and finallyrestoral
Pre-alarm is part ofalarm initiation logicand is treated as high-priority due to its potential escalation.
Correct answer: A. Pre-alarm