CFPS Special Hazard Suppression 3

Question 1

AFFF (Aqueous Film Forming Foam) suppresses flammable liquid fires primarily by:

Accepted Answer

Forming a vapor-suppressing aqueous film and smothering the fuel surface

Answer

AFFF drains an aqueous film ahead of the foam blanket that seals the fuel surface, simultaneously smothering the fire and preventing vapor release.

Question 2

Which NFPA standard covers low-, medium-, and high-expansion foam fire extinguishing systems?

Accepted Answer

NFPA 11

Answer

NFPA 11 is the standard for low-, medium-, and high-expansion foam systems applied to flammable and combustible liquid hazards.

Question 3

Alcohol-resistant AFFF (AR-AFFF) is specifically required when protecting fires involving:

Accepted Answer

Polar solvents such as ethanol, acetone, and isopropanol

Answer

Polar solvents rapidly destroy the foam blanket of standard AFFF by absorbing water; AR-AFFF forms a polymeric membrane that resists solvent breakdown.

Question 4

High-expansion foam is best suited for which type of fire scenario?

Accepted Answer

Enclosed spaces such as basements, mines, or aircraft hangars

Answer

High-expansion foam with expansion ratios of 200:1 to 1000:1 rapidly fills enclosed volumes to exclude oxygen, making it ideal for confined space flooding.

Question 5

The expansion ratio range for medium-expansion foam is:

Accepted Answer

20:1 to 200:1

Answer

NFPA 11 defines low-expansion foam as up to 20:1, medium-expansion as 20:1 to 200:1, and high-expansion as 200:1 to 1000:1.

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS Special Hazard Suppression 3