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

Cooling the fuel below its flash point through water application only

Answer

Chemically inhibiting the combustion chain reaction at the flame front

Answer

Diluting oxygen concentration below 15% above the fuel surface

Question 2

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

Accepted Answer

NFPA 11

Answer

NFPA 13

Answer

NFPA 16

Answer

NFPA 15

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

Hydrocarbon fuels such as gasoline and diesel

Answer

Halogenated hydrocarbons like carbon tetrachloride

Answer

Flammable compressed gases

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

Open outdoor flammable liquid spill fires

Answer

Three-dimensional flowing liquid fires on vertical surfaces

Answer

Class A ordinary combustibles in open-air storage yards

Question 5

The expansion ratio range for medium-expansion foam is:

Accepted Answer

20:1 to 200:1

Answer

Up to 20:1

Answer

200:1 to 1000:1

Answer

Greater than 1000:1

Question 6

Protein foam concentrate is derived from:

Accepted Answer

Hydrolyzed natural protein material such as animal hooves and horns

Answer

Synthetic petrochemical surfactants

Answer

Fluorochemical surfactants bonded to a polymer base

Answer

Synthetic polymer compounds and glycol mixtures

Question 7

When designing a foam-water deluge system for a flammable liquid storage area, the minimum application rate is determined by:

Accepted Answer

NFPA 11 requirements based on fuel type, foam type, and application method

Answer

The type of foam concentrate alone

Answer

Local fire department specifications regardless of NFPA

Answer

The diameter of the largest storage tank only