NICET Special Hazard Suppression Systems 1 — Questions and Answers
Question 1: Which NFPA standard specifically governs carbon dioxide (CO2) extinguishing systems?
- NFPA 11
- NFPA 12 (Correct answer)
- NFPA 17
- NFPA 2001
Correct answer: NFPA 12
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?
- 25%
- 34% (Correct answer)
- 50%
- 72%
Correct answer: 34%
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?
- AFFF (Aqueous Film Forming Foam)
- Protein foam
- AR-AFFF (Alcohol-Resistant AFFF) (Correct answer)
- Fluoroprotein foam
Correct answer: AR-AFFF (Alcohol-Resistant AFFF)
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?
- 10 seconds (Correct answer)
- 30 seconds
- 60 seconds
- 120 seconds
Correct answer: 10 seconds
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)?
- Lower cost per pound
- Significantly lower global warming potential (GWP of 1 vs. 3,220) (Correct answer)
- Requires a lower design concentration
- Faster discharge time
Correct answer: Significantly lower global warming potential (GWP of 1 vs. 3,220)
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.
Question 6: Wet chemical fire suppression systems installed in commercial cooking hood applications must comply with which NFPA standard?
- NFPA 11
- NFPA 12
- NFPA 17A (Correct answer)
- NFPA 750
Correct answer: NFPA 17A
NFPA 17A is the Standard for Wet Chemical Extinguishing Systems and governs design, installation, and maintenance of wet chemical systems used in commercial cooking equipment.
Question 7: Per NFPA 11, what is the typical expansion ratio range for 'high-expansion' foam?
- 2:1 to 10:1
- 10:1 to 200:1
- 200:1 to 1000:1 (Correct answer)
- 1000:1 to 5000:1
Correct answer: 200:1 to 1000:1
NFPA 11 classifies high-expansion foam as having an expansion ratio between 200:1 and 1000:1, making it suitable for flooding large enclosed spaces such as warehouses.
NICET Special Hazard Suppression Systems 1
Which NFPA standard specifically governs carbon dioxide (CO2) extinguishing systems?