Podcast
Questions and Answers
A Class A fire extinguisher with a numerical rating of 2 contains __ gallon of water
A Class A fire extinguisher with a numerical rating of 2 contains __ gallon of water
2.5
A Class B foam extinguisher is not rated for which fuel?
A Class B foam extinguisher is not rated for which fuel?
Cooking oil
A Class C agent must
A Class C agent must
not conduct electricity
A Class C extinguisher is rated for use on
A Class C extinguisher is rated for use on
A Class K agent's effect on the fuel is known as
A Class K agent's effect on the fuel is known as
A fire extinguisher's agent is stored within its
A fire extinguisher's agent is stored within its
A loaded stream extinguisher is designed to
A loaded stream extinguisher is designed to
A portable fire extinguisher is best suited for which situation?
A portable fire extinguisher is best suited for which situation?
A potential problem with application of a multipurpose dry chemical agent to a Class K fire is
A potential problem with application of a multipurpose dry chemical agent to a Class K fire is
According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on the
According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on the
All fire extinguishers are classified according to
All fire extinguishers are classified according to
All portable fire extinguishers use which means for expelling their contents?
All portable fire extinguishers use which means for expelling their contents?
Bromochlorodifluoromethane is a ___ agent
Bromochlorodifluoromethane is a ___ agent
Class D agents work primarily by
Class D agents work primarily by
Combustion begins when a fuel is heated to its
Combustion begins when a fuel is heated to its
Dry chemical extinguishers may be used on Class C fires because they
Dry chemical extinguishers may be used on Class C fires because they
For an area to qualify for the classification of 'light hazard,' most of the combustible present must be
For an area to qualify for the classification of 'light hazard,' most of the combustible present must be
For an extinguishing agent to be approved for use on energized electrical equipment, it must
For an extinguishing agent to be approved for use on energized electrical equipment, it must
For an extinguishing agent to be rated for a particular class of fire, it must
For an extinguishing agent to be rated for a particular class of fire, it must
For the purpose of extinguisher selection and placement, a woodworking shop is a(n) ___ hazard environment
For the purpose of extinguisher selection and placement, a woodworking shop is a(n) ___ hazard environment
For the purpose of extinguisher selection and placement, light hazard environments usually contain amount of combustibles of which class?
For the purpose of extinguisher selection and placement, light hazard environments usually contain amount of combustibles of which class?
For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?
For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?
For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?
For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?
How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
If a private residence has a single fire extinguisher, where should it be located?
If a private residence has a single fire extinguisher, where should it be located?
In general, the maximum reach of CO2 extinguisher is __ feet
In general, the maximum reach of CO2 extinguisher is __ feet
Requirements for placing and mounting portable fire extinguishers are found in NFPA
Requirements for placing and mounting portable fire extinguishers are found in NFPA
The 'P' in the acronym PASS, used in reference to fire extinguisher operation, stands for
The 'P' in the acronym PASS, used in reference to fire extinguisher operation, stands for
The hydrostatic test interval for a dry chemical extinguisher with a stainless steel shell is every __ years
The hydrostatic test interval for a dry chemical extinguisher with a stainless steel shell is every __ years
The traditional symbol for a Class D fire extinguisher is a(n)
The traditional symbol for a Class D fire extinguisher is a(n)
The use of Halon 1211 is strictly controlled because it is
The use of Halon 1211 is strictly controlled because it is
The weight of carbon dioxide is about __ the weight of air
The weight of carbon dioxide is about __ the weight of air
To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must
To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must
What does a rating of 40 on a Class B extinguisher mean?
What does a rating of 40 on a Class B extinguisher mean?
What does it mean when a fire extinguisher has a pictograph with a red slash through it?
What does it mean when a fire extinguisher has a pictograph with a red slash through it?
What expels the extinguishing agent from a pump tank water extinguisher?
What expels the extinguishing agent from a pump tank water extinguisher?
What is a correct use for a portable fire extinguisher?
What is a correct use for a portable fire extinguisher?
What is a primary factor when determining hazard classification for extinguisher selection and placement?
What is a primary factor when determining hazard classification for extinguisher selection and placement?
What is an advantage of portable fire extinguishers over hose lines?
What is an advantage of portable fire extinguishers over hose lines?
What is one disadvantage of CO2 extinguishers?
What is one disadvantage of CO2 extinguishers?
What is the best way to extinguish a Class C fire?
What is the best way to extinguish a Class C fire?
What is the difference between dry powder and dry chemical extinguishing agents?
What is the difference between dry powder and dry chemical extinguishing agents?
What is the most commonly used extinguishing agent for Class A fires?
What is the most commonly used extinguishing agent for Class A fires?
What is the primary extinguishing mechanism of dry chemical agent?
What is the primary extinguishing mechanism of dry chemical agent?
What is the term for a water-soluble flammable liquid?
What is the term for a water-soluble flammable liquid?
What is the term for the substance that puts out the fire?
What is the term for the substance that puts out the fire?
What is used to pressurize a stored-pressure water extinguisher?
What is used to pressurize a stored-pressure water extinguisher?
What residue does a CO2 fire extinguisher leave when discharged?
What residue does a CO2 fire extinguisher leave when discharged?
When approaching a fire with an extinguisher in hand, you should always have a(n)
When approaching a fire with an extinguisher in hand, you should always have a(n)
Which agent is approved for use in a Class K system?
Which agent is approved for use in a Class K system?
Which agent is rated for use on Class A fires?
Which agent is rated for use on Class A fires?
Which class of fire extinguisher includes a number in its classification?
Which class of fire extinguisher includes a number in its classification?
Which class of fire includes cloth?
Which class of fire includes cloth?
Which class of fire includes flammable and combustible liquids?
Which class of fire includes flammable and combustible liquids?
Which class of fire involves combustible cooking oils and fats?
Which class of fire involves combustible cooking oils and fats?
Which class of fire involves combustible metals?
Which class of fire involves combustible metals?
Which class of fire involves energized electrical equipment?
Which class of fire involves energized electrical equipment?
Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
Which class of fire is depicted in the pictograph system by a fire in a frying pan?
Which class of fire is depicted in the pictograph system by a fire in a frying pan?
Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?
Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?
Which class of fire is depicted in the pictograph system by a flame and gasoline can?
Which class of fire is depicted in the pictograph system by a flame and gasoline can?
Which compound is added to a water extinguisher to improve penetration of fuel?
Which compound is added to a water extinguisher to improve penetration of fuel?
Which extinguishing agent is suitable for use on a Class C fire?
Which extinguishing agent is suitable for use on a Class C fire?
Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
Which feature of some carbon dioxide extinguishers makes them dangerous for use on Class C fires?
Which feature of some carbon dioxide extinguishers makes them dangerous for use on Class C fires?
Which fire extinguishing agent is best for use on sensitive electronic equipment?
Which fire extinguishing agent is best for use on sensitive electronic equipment?
Which hazard category includes automotive service or repair facilities?
Which hazard category includes automotive service or repair facilities?
Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?
Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?
Which of the following is commonly used as a dry chemical extinguishing agent?
Which of the following is commonly used as a dry chemical extinguishing agent?
Which of the following is one of the three basic components required for fire?
Which of the following is one of the three basic components required for fire?
Which statement about dry chemical agents is correct?
Which statement about dry chemical agents is correct?
Which statement about foam fire extinguishers is correct?
Which statement about foam fire extinguishers is correct?
Which statement about the numerical rating of a Class K is correct?
Which statement about the numerical rating of a Class K is correct?
Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?
Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?
Which statement is correct regarding Class D extinguishing agents?
Which statement is correct regarding Class D extinguishing agents?
Study Notes
Fire Extinguisher Classifications and Usage
- Class A fire extinguishers combat ordinary combustibles like wood and cloth; a numerical rating of 2 indicates it can hold 2.5 gallons of water.
- Class B extinguishers are used for flammable liquids and are ineffective against cooking oil.
- Class C extinguishers are specifically designed for energized electrical equipment and must not conduct electricity.
- Class K extinguishers target combustible cooking oils and fats; their action is termed saponification.
- Class D extinguishers are specialized for combustible metals, bringing unique challenges in firefighting.
Extinguisher Components and Functionality
- The extinguishing agent in fire extinguishers is stored within a cylinder and is expelled using pressure.
- A loaded stream extinguisher is resistant to freezing temperatures for reliable operation in cold conditions.
- CO2 extinguishers typically have a maximum effective range of 8 feet and leave no residue upon discharge.
Extinguisher Placement and Hazard Classification
- Proper placement of extinguishers depends on occupancy type, with light hazard environments containing fewer combustibles.
- Areas with a lot of combustibles require extra caution, hence possibly needing extra extinguishing equipment.
- For safety, a fire extinguisher should be located in the kitchen if found in a private residence.
Fire Chemistry and Safety Measures
- Combustion begins when fuel reaches its ignition point, emphasizing the importance of heat management.
- In tackling a Class C fire, the recommended approach is to shut off power sources and treat the scene as a Class A or B fire.
- Understanding the relationship between occupancy type and hazard classification is crucial; they do not always correlate.
Agent Specifications and Handling
- Multipurpose dry chemical agents effectively prevent rekindling Class A fuels by forming a crust over them.
- Each extinguishing agent has distinct properties; for example, halogenated agents like Bromochlorodifluoromethane are highly effective yet environmentally harmful.
- The hydrostatic testing for certain extinguishers, such as those with stainless steel, occurs every 5 years to ensure integrity.
Extinguisher Operation and Maintenance
- The acronym PASS (Pull, Aim, Squeeze, Sweep) is essential for proper extinguisher operation, with "P" representing "pull" for removing the pin.
- A dry chemical extinguisher must be serviced after any use, ensuring readiness for future incidents.
- Class K extinguishers do not follow a numerical rating system, highlighting their unique safety specifications.
Pictograph Recognition and Chemical Properties
- Pictographs indicate fire types represented by symbols: a burning trash can for Class A, a frying pan for Class K, and a flame with a gas can for Class B.
- Understanding the correct extinguishing method, such as using foam for liquid fires, is crucial for effective firefighting.
- Carbon dioxide extinguishing agents are safe for sensitive electronic equipment due to their non-residuum nature.
Risks and Limitations
- The use of CO2 extinguishers can be risky on Class C fires due to the potential hazards posed by their metal horns.
- Some dry chemical agents can interrupt the chemical chain reaction necessary for fire, illustrating their effectiveness; however, they may not be suited for all situations.
- Advantages of portable extinguishers, including quicker deployment compared to hose lines, should be recognized during selection and training.
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Description
This quiz reviews the classifications and usage of various fire extinguishers. It covers essential details about Class A, B, C, K, and D extinguishers, as well as their components and functionality. Test your knowledge on how to effectively combat different types of fires and the mechanics behind fire extinguishers.
