Portable Fire Extinguisher Ch. 7 Quiz

Questions and Answers

What does NFPA 10 stand for?

National Fire Protection Association Safety Protocol

National Fire Prevention Association Standard

National Fire Protection Association Standard for portable fire extinguishers (correct)

National Fire Program Assessment

What type of fire does a Class A fire involve?

Ordinary combustibles such as textiles, paper, plastics, rubber, and wood.

What is a Dry Chemical extinguishing system used for?

Protecting areas containing volatile flammable liquids.

What does Class B fire involve?

Flammable and combustible liquids and gases. Signup and view all the answers

What is the main characteristic of a Class C fire?

It involves energized electrical equipment. Signup and view all the answers

What distinguishes Class D fire?

Involves combustible alloys such as lithium, magnesium, potassium, and sodium. Signup and view all the answers

What type of fire does a Class K fire involve?

Combustible cooking oils such as vegetable or animal fats. Signup and view all the answers

What is Saponification?

The formation of a soapy film during the reaction of alkaline-based chemicals with certain cooking oils. Signup and view all the answers

Air-aspirating foam nozzles are designed for high-expansion foam.

False Signup and view all the answers

What is deionized water?

Water from which ionic salts, minerals, and impurities have been removed. Signup and view all the answers

What do clean agents replace?

Halogenated extinguishing agents Signup and view all the answers

How are Class K fire extinguishers tested?

For effectiveness against 2.25 square feet of light cooking oil. Signup and view all the answers

Portable fires are identified using geometric shapes and ______.

pictographs. Signup and view all the answers

How often should portable fire extinguishers be inspected according to NFPA 10?

At least once a year. Signup and view all the answers

What are the two designs for handheld dry chemical extinguishers?

Cartridge operated and stored-pressure. Signup and view all the answers

What should be protected against freezing if exposed to temperatures below 40°F?

Water type extinguishers. Signup and view all the answers

Dry chemical agents are only for use on Class B fires.

False Signup and view all the answers

Study Notes

NFPA Standards

NFPA 10 is the standard governing portable fire extinguishers.

Fire Classifications

Class A fires: Involve ordinary combustibles (textiles, paper, wood); extinguished with water or water-based agents.
Class B fires: Involve flammable liquids (gasoline, alcohol); extinguished with CO2, dry chemical, or Class B foam.
Class C fires: Involve energized electrical equipment; water cannot be used until electrical energy is eliminated; requires non-conductive agents.
Class D fires: Involve combustible metals (lithium, magnesium); require Class D dry powder extinguishers.
Class K fires: Involve cooking oils; extinguished with wet chemical systems.

Extinguishing Agents

Dry Chemical: Used for Class A, B, and C fires; protects areas with flammable liquids.
Dry Powder: Specifically for Class D fires.
Wet Chemical: Designed for Class K fires; uses a potassium-based agent for saponification.
Clean Agents: Rapidly evaporating liquids, non-residue, effective on Class A, B, and non-conductive for C fires.
Carbon Dioxide: Effective for Class B and C fires; displaces oxygen.
Halogenated Agents: Chemical compounds containing halogens, primarily used for specialized fire suppression.

Extinguisher Designs

Handheld Dry Chemical: Two types include cartridge-operated and stored-pressure, operating under about 200 psi.
Wheeled Dry Chemical Units: Larger variant suitable for Class A, B, and C fires.

Extinguisher Ratings

Class A rating: Ranges from 1-A to 40-A based on gallons of extinguishing agent.
Class B rating: Ranges from 1-B to 640-B, based on square footage of a flammable liquid fire that can be extinguished.
Class C rating: Focuses on electrical non-conductivity; no numerical rating.
Class D rating: No numerical rating; includes application instructions.
Class K rating: Tested to combat light cooking oil; must perform saponification.

Labeling

Class A: Green triangle
Class B: Red square
Class C: Blue circle
Class D: Yellow square
Class K: Black hexagon

Inspection and Maintenance

Portable extinguishers require inspection at least once a year.
Key inspection factors: serviceability, accessibility, simplicity of operation.
Every six years, dry chemical agents should be emptied and refilled.
Water extinguishers should be protected against freezing below 40°F.

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Description

Test your knowledge on the standards and types of portable fire extinguishers with this quiz based on Chapter 7. Learn about NFPA 10 and various classes of fires, including Class A fires and dry chemical extinguishing systems. Perfect for anyone looking to enhance their fire safety knowledge.