CFPS Special Hazard Suppression 4

Question 1

Which NFPA standard governs fixed dry chemical fire extinguishing systems?

Accepted Answer

NFPA 17

Answer

NFPA 17 covers dry chemical extinguishing systems, including fixed piped systems and local application systems protecting industrial and commercial hazards.

Question 2

Wet chemical extinguishing systems installed in commercial cooking hoods must comply with:

Accepted Answer

NFPA 17A (wet chemical standard)

Answer

NFPA 17A specifically covers wet chemical extinguishing systems for commercial cooking equipment, while NFPA 96 covers the overall ventilation and fire protection requirements for cooking operations.

Question 3

Potassium bicarbonate (Purple-K) dry chemical extinguishes fires primarily through:

Accepted Answer

Chain reaction interruption (chemical flame inhibition)

Answer

Purple-K is highly effective on Class B fires because potassium ions chemically interfere with the free-radical chain reaction sustaining the flame.

Question 4

In commercial kitchen wet chemical systems, the agent suppresses grease fires partly through a process called saponification, which involves:

Accepted Answer

Reacting with cooking oils to form a soapy foam that seals and cools the grease surface

Answer

Saponification is the alkaline wet chemical agent reacting with hot cooking oils to form a soapy layer that seals the grease surface and provides lasting re-ignition resistance.

Question 5

Fixed dry chemical systems are generally NOT recommended for areas containing:

Accepted Answer

Delicate electronic equipment and sensitive instrumentation

Answer

Dry chemical agents are corrosive, abrasive, and difficult to clean up, making them unsuitable for environments with sensitive electronics or precision equipment where agent residue causes damage.

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS (Certfied Fire Protection Specialist) Practice Test

CFPS Special Hazard Suppression 4