FST Smoke Detection 3

Question 1

In a duct smoke detector installation, where should the sampling tube inlet be positioned relative to airflow?

Accepted Answer

Downstream of filters and coils, upstream of branch takeoffs

Answer

Sampling tubes should be positioned downstream of filters and coils but upstream of branch takeoffs to sample representative air without filter interference.

Question 2

Which NFPA 72 category requires smoke detectors to be tested using 'canned smoke' or a listed aerosol during acceptance testing?

Accepted Answer

Operational test using a listed test method

Answer

NFPA 72 requires an operational test using a listed smoke entry test method (such as canned smoke) during acceptance to verify detector response.

Question 3

What is the PRIMARY purpose of a smoke detector's 'alarm verification' feature?

Accepted Answer

To introduce a time delay before transmitting an alarm to reduce false alarms

Answer

Alarm verification introduces a programmed delay and re-sampling period before an alarm is transmitted, reducing false alarms from transient conditions.

Question 4

According to NFPA 72, how often must the sensitivity of system smoke detectors be tested after the first required test?

Accepted Answer

Every 2 years or per manufacturer recommendation

Answer

NFPA 72 requires sensitivity testing within one year of installation and then at intervals not exceeding two years or per manufacturer recommendations.

Question 5

A smoke detector installed on a pitched ceiling with a slope greater than 1 foot in 8 feet should be placed how far from the peak?

Accepted Answer

Within 36 inches of the peak

Answer

NFPA 72 requires that on sloped ceilings steeper than 1:8, detectors be located within 36 inches of the peak measured horizontally, where hot gases accumulate.

(FST) Fire Safety Technician Certification Practice Test

(FST) Fire Safety Technician Certification Practice Test

FST Smoke Detection 3