S95 Fire Alarm System Components 3

Question 1

Per NFPA 72, what is the minimum sound pressure level required for audible notification appliances in sleeping areas?

Accepted Answer

75 dB at the pillow

Answer

NFPA 72 requires audible notification appliances in sleeping areas to produce at least 75 dB at the pillow level to awaken sleeping occupants.

Question 2

Visible notification appliances (strobes) are required in locations where:

Accepted Answer

Ambient noise levels may prevent audible signals from being heard

Answer

Strobes are required where high ambient noise could mask audible signals, and in areas used by people with hearing impairments, to ensure effective notification.

Question 3

The candela (cd) rating of a strobe used in a fire alarm system refers to its:

Accepted Answer

Light intensity measurement

Answer

Candela is the SI unit of luminous intensity; the candela rating of a strobe defines how bright the light output is, which determines its effective coverage area.

Question 4

Per NFPA 72, at what flash rate must visible notification appliances (strobes) operate?

Accepted Answer

1 to 2 flashes per second

Answer

NFPA 72 requires strobe flash rates between 1 Hz and 2 Hz to be effective for notification while avoiding frequencies that could trigger photosensitive seizures.

Question 5

Which circuit type connects notification appliances to the fire alarm control panel?

Accepted Answer

Notification Appliance Circuit (NAC)

Answer

The Notification Appliance Circuit (NAC) is the dedicated circuit used to power and activate horns, strobes, and other audible/visible devices.

(S95) Supervision of Fire Alarm System Practice Test

(S95) Supervision of Fire Alarm System Practice Test

S95 Fire Alarm System Components 3