S95 Fire Alarm System Operation 2

Question 1

During a fire alarm signal, the control unit begins a pre-signal delay before notifying occupants. What is the primary purpose of this delay?

Accepted Answer

To permit trained personnel to investigate and confirm the alarm before general evacuation

Answer

To allow time for automatic suppression systems to activate first

Answer

To give the fire department time to arrive on scene before occupants react

Answer

To reset the initiating device if it was triggered accidentally

Question 2

A smoke detector in a corridor repeatedly goes into alarm during early morning hours with no visible smoke present. The MOST likely cause is:

Accepted Answer

High humidity or condensation affecting the detector chamber

Answer

Faulty wiring in the initiating device circuit

Answer

The detector is programmed for nighttime sensitivity mode

Answer

Electromagnetic interference from HVAC startup

Question 3

According to NFPA 72, a single station smoke alarm differs from a system smoke detector primarily because it:

Accepted Answer

Contains its own integral notification appliance and is self-contained

Answer

Uses a different sensing principle that is more accurate

Answer

Must be connected to a supervising station to be code-compliant

Answer

Is only permitted in residential occupancies of less than 500 sq ft

Question 4

A fire alarm control unit (FACU) is in the 'silenced' condition. Which of the following statements is TRUE?

Accepted Answer

Audible notification has been silenced but visual indicators and alarm condition remain active

Answer

The alarm signal has been acknowledged and all initiating devices have reset

Answer

The system has been placed in a full reset and is ready for normal operation

Answer

Remote supervising station notification has been suspended until manual reset

Question 5

Which component in a fire alarm system is responsible for converting a detected condition into an electrical signal sent to the control unit?

Accepted Answer

Initiating device

Answer

Notification appliance

Answer

Signal line circuit

Answer

Annunciator panel

Question 6

A fire alarm system supervisory signal is generated when:

Accepted Answer

A sprinkler system valve is found in a partially closed position

Answer

A smoke detector enters alarm state

Answer

The control unit battery voltage drops below acceptable levels

Answer

A manual pull station is activated by a building occupant

Question 7

In a fire alarm system, Class B wiring differs from Class A wiring primarily in that Class B:

Accepted Answer

Does not provide continuity of operation when a single open fault occurs

Answer

Uses fiber optic cable instead of copper conductors

Answer

Requires end-of-line devices at each initiating device

Answer

Is only approved for use with addressable control panels