NICET Special Hazard Suppression Systems

Question 1

Which NFPA standard specifically governs carbon dioxide (CO2) extinguishing systems?

Accepted Answer

NFPA 12

Answer

NFPA 12 is the Standard on Carbon Dioxide Extinguishing Systems, covering design, installation, testing, and maintenance of CO2 systems.

Question 2

Per NFPA 12, what is the minimum total flooding design concentration of CO2 required to extinguish Class A surface fires?

Accepted Answer

34%

Answer

NFPA 12 specifies a minimum CO2 concentration of 34% by volume for total flooding protection of Class A surface fire hazards.

Question 3

Which foam concentrate is specifically formulated to suppress fires involving polar solvents such as alcohols and ketones?

Accepted Answer

AR-AFFF (Alcohol-Resistant AFFF)

Answer

AR-AFFF forms a polymeric membrane on polar solvent surfaces that prevents the solvent from breaking down the foam blanket, unlike standard AFFF.

Question 4

Per NFPA 2001, what is the maximum time allowed to achieve the minimum design concentration in a total flooding clean agent system protecting a normally occupied space?

Accepted Answer

10 seconds

Answer

NFPA 2001 requires that the design concentration be achieved within 10 seconds in normally occupied enclosures to minimize personnel exposure before evacuation.

Question 5

What is the primary environmental advantage of Novec 1230 (FK-5-1-12) over HFC clean agents such as FM-200 (HFC-227ea)?

Accepted Answer

Significantly lower global warming potential (GWP of 1 vs. 3,220)

Answer

Novec 1230 has a GWP of just 1 and an atmospheric lifetime of about 5 days, compared to FM-200's GWP of 3,220 and ~34-year lifetime.

NICET - National Institute for Certification in Engineering Technologies Practice Test

NICET - National Institute for Certification in Engineering Technologies Practice Test

NICET Special Hazard Suppression Systems