NFPA 72 requires that the secondary power supply be capable of powering the fire alarm system under quiescent or supervisory loadfor 24 hours, followed by full alarm load for a minimum time (typically 5 or
15 minutes depending on system type).
NFPA 72 (2022), Section 10.6.7.2.1.1:
"The secondary power supply shall have sufficient capacity to operate the system under quiescent load (supervisory condition) for a minimum of 24 hours..." Testing should verify operation under thissupervisory (normal monitoring)condition.
Correct answer: D. Supervisory load

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

Whensite-specific software(such as logic for fire alarm control panels) is changed,100% of the devices affectedby that change must be tested to confirm correct operation. Also,10% of unaffected devicesmust be tested as a safeguard.
NFPA 72 (2022), Section 14.4.2.2.4:
"When system software is modified, 100% of the affected devices or functions and 10% of the nonaffected devices or functions shall be tested." This ensures that updates don't unintentionally compromise unrelated areas of the system.
Correct answer: D. 100% of devices affected

To verify that smoke detectors are operating within their listed sensitivity range, NFPA 72 provides three approved testing methods. These ensure proper functionality and compliance with safety requirements.
NFPA 72 (2022), Section 14.4.4.3.1:
"Sensitivity shall be checked using any of the following methods:
(1) Calibrated test method approved by the authority having jurisdiction (2) Listed control equipment arranged for the purpose (3) Calibrated sensitivity test instrument of the smoke detector manufacturer" The option "test approved by the engineer" isnot listedamong the approved sensitivity test methods in NFPA
72, and therefore is not acceptable for compliance.

Before performing any inspection or testing activities, it's critical tonotify all affected parties, including occupants, central stations, and local authorities (as applicable), toprevent accidental dispatch of emergency services. The reason for this is clearly stated inNFPA 72 (2022 Edition), Section 14.2.3.1, which requires notification of all stakeholders before any test.
NFPA 72:2022 - 14.2.3.1
"Prior to any testing,all persons and facilities receiving alarm, supervisory, or trouble signals, and all building occupantsshall benotifiedto preventunnecessary response." This is critical for avoiding disruptions like fire department rollouts or building evacuations that could be triggered by system activations during a test. That makes the correct answer:
D: Unnecessary response