For inspection purposes (not testing), projected beam detectors arevisually checkedforobstructions, alignment issues, and cleanlinessof lenses.
NFPA 72 (2022), Table 14.3.1 - Inspection Frequencies:
"Projected beam smoke detectors" # Inspect quarterly
Method: Check for obstruction, alignment, cleanliness
Testing uses an optical filter, butinspectionis visual.
Correct answer: A. Check for obstruction

If smoke detectors are installed during construction, they are likely exposed to dust or debris. NFPA 72 requires that these becleaned and tested for sensitivitybeforefinal commissioningof the system.
NFPA 72 (2022), Section 17.7.1.11:
"Where detectors are used for protection during construction, they shall be cleaned or replaced prior to final system commissioning." This ensures proper performance and prevents false alarms.
Correct answer: B. Final commissioning

Radio transmitters used in fire alarm systems for off-premises signal transmission must be inspected to verify physical condition, connections, and proper operation. The requiredinspection interval is quarterly.
NFPA 72 (2022), Table 14.3.1 - Inspection Frequencies:
"Radio transmitters" # Frequency: Quarterly
Correct answer: B. Quarterly

When a system monitors sprinklerwaterflow(alarm) andvalve tamper switches(supervisory), the system must send the following to the supervising station:
* Alarm signals(from flow)
* Trouble signals(e.g., open circuits)
* Supervisory signals(e.g., valve partially closed)
NFPA 72 (2022), Section 26.2.2.1:
"A fire alarm system connected to a supervising station shall transmit alarm, trouble, and supervisory signals..." There isno requirementfor phone line failure or primary power loss to be transmitted unless required by local code.
Correct answer: B. Alarm, trouble, and supervisory

NFPA 72 places amaximum allowable sound pressure levelto prevent hearing damage or discomfort in occupied areas.
NFPA 72 (2022), Section 18.4.1.5:
"The total sound pressure level produced by the fire alarm system, including ambient noise, shall not exceed
105 dBA at the minimum hearing distance from the audible appliance."
This ensures alarm audibilitywithout causing harm.
Correct answer: B. 105 dBA