S95 Fire Alarm System Operation 4

Question 1

A fire alarm system's secondary power supply (battery) must be capable of operating the system in standby mode for a minimum of how many hours, per NFPA 72?

Accepted Answer

24 hours

Answer

NFPA 72 requires secondary power sufficient to operate the system in standby mode for 24 hours, followed by 5 minutes of alarm operation.

Question 2

A duct smoke detector installed in an HVAC system is PRIMARILY intended to:

Accepted Answer

Detect smoke in the air stream and shut down the air handling unit to prevent smoke spread

Answer

Duct smoke detectors are designed to prevent HVAC systems from recirculating smoke throughout a building by shutting down the air handler upon detection.

Question 3

Under NFPA 72, which entity has final authority over the installation and operation of a fire alarm system?

Accepted Answer

The authority having jurisdiction (AHJ)

Answer

The AHJ, typically the local fire marshal or building official, has final authority over fire alarm system compliance and operation under NFPA 72.

Question 4

A waterflow switch on a wet-pipe sprinkler system sends a signal to the fire alarm control unit when:

Accepted Answer

Water flows through the system due to sprinkler operation or pipe break

Answer

A waterflow switch is activated by water movement in the sprinkler pipe, typically caused by a sprinkler head operating or a pipe failure.

Question 5

When a fire alarm system is tested, notification appliances in occupied spaces must be:

Accepted Answer

Coordinated with occupants in advance and the AHJ notified before testing

Answer

Pre-notification of occupants and the AHJ before testing prevents unnecessary panic, unnecessary fire department dispatch, and undue disruption.

(S95) Supervision of Fire Alarm System Practice Test

(S95) Supervision of Fire Alarm System Practice Test

S95 Fire Alarm System Operation 4