30 Questions
Which classification of fire occurs in kitchens with cooking oils and grease?
Class K
Which classification of fire occurs in combustible metals such as magnesium and titanium?
Class D
Which classification of fire occurs in ordinary combustible materials such as wood and paper?
Class A
Which type of fire extinguishing agent is effective on class B and C type fires only?
Gaseous
What is the primary mechanism of extinguishment by water?
Cooling the fuel and oxidizing agent mixture below the ignition temperature
Which type of dry chemical fire extinguishing agent is based on ammonium phosphates and is effective on class A fires?
Multi-Purpose
Which type of foam extinguishing agent is mostly obsolete in North America?
Chemical foams
What is the dilution ratio for the two most common mechanical foam solutions?
3% foam concentrate to 97% water
Which type of foam concentrate is derived from a naturally-occurring chemical found in the hoofs and horns of animals?
Protein foam
Which type of foam concentrate was developed to provide very rapid-fire extinguishment capabilities?
Aqueous film forming foam (AFFF)
Which type of fire extinguishing agent is effective on class B and C type fires only?
Gaseous
What is the primary mechanism of extinguishment by water?
Cooling the fuel and oxidizing agent
Which type of foam concentrate is derived from a naturally-occurring chemical found in the hoofs and horns of animals?
Protein
Which classification of fire occurs in the vapour-air mixture over the surface of flammable liquids such as greases, gasoline, and lubricating oils?
Class B
What is the primary purpose of a fire protection system?
To protect people and property from loss due to fire
Which type of fire extinguishing agent is effective on class K fires that occur in kitchens with cooking oils and grease?
Wet chemical
Which type of foam concentrate is derived from a naturally-occurring chemical found in the hoofs and horns of animals?
Protein foam concentrate
Which classification of fire occurs in ordinary combustible materials such as wood and paper?
Class A fire
Which type of foam extinguishing agent is effective on class B and C type fires only?
Protein foam
Which type of dry chemical fire extinguishing agent is based on ammonium phosphates and is effective on class A fires?
Monammonium phosphate
Which classification of fire occurs in energized electrical equipment?
Class C
Which type of fire extinguishing agent is effective on class B and C type fires only?
Foam
What is the primary purpose of a fire protection system?
To extinguish fires
Which type of fire extinguishing agent is effective on class A, B, and C type fires?
Dry chemicals
Which type of fire extinguishing agent is mainly used in portable and wheeled extinguishers?
Dry chemicals
Which type of fire extinguishing agent is effective on class D combustibles such as sodium and potassium?
Dry powders
Which type of foam concentrate is commonly used in both topside and subsurface applications for the protection of flammable and combustible liquid storage tanks?
Aqueous film forming foam (AFFF)
Which type of foam concentrate is effective on non-water-soluble fuels such as gasoline, diesel fuel, crude oil, kerosene, and toluene?
Protein foam
Which type of foam concentrate is formulated to be used on water-soluble fuels such as methyl alcohol or acetone?
Alcohol-Resistant Concentrates (ARC)
What is the expansion ratio for high expansion foam?
200:1 or greater
Study Notes
Fire Protection Systems and Extinguishing Agents
- Fires are classified based on the material burning and each type requires a specific extinguishing media.
- The five classifications of fires are Class A (ordinary combustibles), Class B (flammable liquids), Class C (energized electrical equipment), Class D (combustible metals), and Class K (cooking oils and grease).
- Fire protection systems are essential for preventing loss from fires and include fire detection and alarm systems, standpipe systems, sprinkler systems, and firewater systems.
- The most common types of fire extinguishing agents are dry chemicals, gaseous agents, dry powders, water, and foams.
- Dry chemical agents are effective in extinguishing fires and are used in portable and wheeled extinguishers, with sodium bicarbonate and potassium bicarbonate being commonly used.
- Gaseous extinguishing agents, such as nitrogen or carbon dioxide, are used on class C fires to prevent electric shock, while halons have been banned due to ozone layer depletion.
- Dry powders are specifically developed for class D combustibles, such as reactive and combustible metals.
- Water is used on class A fires and works by cooling the fuel and removing heat through steam displacement.
- Foam is created by adding certain materials to water and is used on class B flammable and combustible liquids. There are two types: chemical foams and mechanical foams.
- Mechanical foam agents separate the fuel and oxidizing agent, while also producing a cooling effect through boiling water.
- Protein foam is derived from animal hoofs and horns, while fluoroprotein foam and aqueous film-forming foam (AFFF) are more effective alternatives.
- Synthetic foam concentrates are based on synthetic surfactants and are categorized by their expansion ratio: low, medium, and high expansion foam.
Test your knowledge of fire classification and extinguishing media with this quiz. Learn about the different types of fires and the appropriate methods to safely extinguish them.
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