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Questions and Answers
A Class A fire extinguisher with a numerical rating of 2 contains _____ of water.
A Class A fire extinguisher with a numerical rating of 2 contains _____ of water.
2.5
A Class B foam extinguisher is effective on all of the following fuels except one. Choose the exception.
A Class B foam extinguisher is effective on all of the following fuels except one. Choose the exception.
What must a Class C agent do?
What must a Class C agent do?
not conduct electricity
A Class C extinguisher is rated for use on:
A Class C extinguisher is rated for use on:
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What is the effect of a Class K agent on the fuel?
What is the effect of a Class K agent on the fuel?
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What is a loaded stream extinguisher designed to do?
What is a loaded stream extinguisher designed to do?
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A portable fire extinguisher is best suited for which situation?
A portable fire extinguisher is best suited for which situation?
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What is a potential problem with applying a multipurpose dry chemical agent to a Class K fire?
What is a potential problem with applying a multipurpose dry chemical agent to a Class K fire?
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According to NFPA standards, the maximum floor area that can be protected by each extinguisher is specified according to:
According to NFPA standards, the maximum floor area that can be protected by each extinguisher is specified according to:
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All fire extinguishers are classified according to:
All fire extinguishers are classified according to:
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All portable fire extinguishers use which means for expelling their contents?
All portable fire extinguishers use which means for expelling their contents?
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Bromochlorodifluoromethane is a _________ agent.
Bromochlorodifluoromethane is a _________ agent.
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Class B foam fire extinguishers are also effective on:
Class B foam fire extinguishers are also effective on:
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Class D agents work primarily by:
Class D agents work primarily by:
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Combustion begins when a fuel is heated to its:
Combustion begins when a fuel is heated to its:
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Dry chemical extinguishers may be used on Class C fires because they:
Dry chemical extinguishers may be used on Class C fires because they:
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For an area to qualify for the classification of 'light hazard,' most of the combustibles present must be:
For an area to qualify for the classification of 'light hazard,' most of the combustibles present must be:
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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:
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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.
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For the purpose of extinguisher selection and placement, light hazard environments may contain a limited amount of combustibles of which class?
For the purpose of extinguisher selection and placement, light hazard environments may contain a limited amount of combustibles of which class?
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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?
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For the purpose of extinguisher placement, what is the relationship between occupancy use category and hazard classification?
For the purpose of extinguisher placement, what is the relationship between occupancy use category and hazard classification?
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How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
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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?
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In general, the maximum discharge range of a CO2 extinguisher is:
In general, the maximum discharge range of a CO2 extinguisher is:
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Requirements for placing and mounting portable fire extinguishers are found in NFPA:
Requirements for placing and mounting portable fire extinguishers are found in NFPA:
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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.
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The production and use of Halon extinguishing agents is limited because they are:
The production and use of Halon extinguishing agents is limited because they are:
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The traditional symbol for a Class D fire extinguisher is a(n):
The traditional symbol for a Class D fire extinguisher is a(n):
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The weight of carbon dioxide is about ___________ times the weight of air.
The weight of carbon dioxide is about ___________ times the weight of air.
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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:
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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:
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What does a rating of 40 on a Class B extinguisher mean?
What does a rating of 40 on a Class B extinguisher mean?
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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?
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What expels the extinguishing agent from a pump tank water extinguisher?
What expels the extinguishing agent from a pump tank water extinguisher?
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What is an advantage of portable fire extinguishers over hose lines?
What is an advantage of portable fire extinguishers over hose lines?
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What is the best way to extinguish a Class C fire?
What is the best way to extinguish a Class C fire?
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What is the difference between dry powder and dry chemical extinguishing agents?
What is the difference between dry powder and dry chemical extinguishing agents?
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What is the most commonly used extinguishing agent for Class A fires?
What is the most commonly used extinguishing agent for Class A fires?
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What is the primary extinguishing mechanism of halogenated agents?
What is the primary extinguishing mechanism of halogenated agents?
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What is the term for a water-soluble flammable liquid?
What is the term for a water-soluble flammable liquid?
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What is the term for the substance that puts out the fire?
What is the term for the substance that puts out the fire?
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What residue does a CO2 fire extinguisher leave when discharged?
What residue does a CO2 fire extinguisher leave when discharged?
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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):
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Which agent is rated for use on Class A fires?
Which agent is rated for use on Class A fires?
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Which class of fire extinguisher includes a number in its classification?
Which class of fire extinguisher includes a number in its classification?
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Which class of fire includes cloth?
Which class of fire includes cloth?
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Which class of fire includes combustible cooking oils and fats?
Which class of fire includes combustible cooking oils and fats?
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Which class of fire includes combustible metals?
Which class of fire includes combustible metals?
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Which class of fire includes flammable and combustible liquids?
Which class of fire includes flammable and combustible liquids?
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Which class of fire involves energized electrical equipment?
Which class of fire involves energized electrical equipment?
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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?
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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?
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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?
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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?
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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?
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Which extinguishing agent is approved for use in a Class K system?
Which extinguishing agent is approved for use in a Class K system?
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Which extinguishing agent is suitable for use on a Class C fire?
Which extinguishing agent is suitable for use on a Class C fire?
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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?
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Which fire extinguishing agent is best for use on sensitive electronic equipment?
Which fire extinguishing agent is best for use on sensitive electronic equipment?
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Which hazard category includes automotive service or repair facilities?
Which hazard category includes automotive service or repair facilities?
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Which is a disadvantage of CO2 extinguishers?
Which is a disadvantage of CO2 extinguishers?
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Which is a primary factor when determining hazard classification for extinguisher selection and placement?
Which is a primary factor when determining hazard classification for extinguisher selection and placement?
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Which is one of the three basic components required for fire?
Which is one of the three basic components required for fire?
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Which is the most appropriate use for a portable fire extinguisher?
Which is the most appropriate use for a portable fire extinguisher?
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Which is used to pressurize a stored-pressure water extinguisher?
Which is used to pressurize a stored-pressure water extinguisher?
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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?
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Dry chemical agents are not subject to freezing.
Dry chemical agents are not subject to freezing.
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There is no numerical rating for a Class K extinguisher.
There is no numerical rating for a Class K extinguisher.
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A dry chemical extinguisher should be serviced and recharged after any discharge.
A dry chemical extinguisher should be serviced and recharged after any discharge.
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The specific agent must be matched to the specific fuel in Class D extinguishing.
The specific agent must be matched to the specific fuel in Class D extinguishing.
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Which test is required to measure the ability of an extinguisher cylinder to withstand steady internal pressure?
Which test is required to measure the ability of an extinguisher cylinder to withstand steady internal pressure?
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Study Notes
Fire Extinguisher Classifications and Ratings
- Class A fire extinguisher with a rating of 2 contains 2.5 gallons of water.
- Class B foam extinguishers are ineffective against cooking oils.
- Class C extinguishers are for energized electrical equipment and must not conduct electricity.
- Class K extinguishing agents utilize saponification to affect fuels.
Fire Extinguisher Functionality
- Loaded stream extinguishers are designed to resist freezing.
- All portable fire extinguishers operate by release through pressure.
- Class B foam extinguishers can also tackle Class A fires.
- Dry chemical extinguishers do not conduct electricity, making them suitable for Class C fires.
Fire Hazard Classifications
- NFPA standards dictate maximum floor area covered by extinguishers based on occupancy type.
- Light hazard areas must have combustibles arranged to minimize fire spread.
- Extra hazard environments, like woodworking shops, require careful extinguisher selection due to increased combustibles.
Extinguishing Techniques and Agents
- Multi-purpose dry chemical agents can neutralize other agents on Class K fires.
- For a single extinguisher in a private residence, placement is best in the kitchen.
- CO2 extinguishers typically have a maximum discharge range of 8 feet (2.5m).
- Halogenated agents extinguish fires through disrupting molecular chain reactions.
Fire Extinguisher Inspection and Maintenance
- Hydrostatic testing on dry chemical extinguishers with stainless-steel shells is required every 5 years.
- Portable extinguishers should be serviced and recharged after any discharge.
- Class K extinguishers do not have a numerical rating; their efficacy is predefined by their specific use.
Fire Classes Overview
- Class D fire extinguishers are marked with a yellow star and are used for combustible metals.
- Class A fires involve ordinary combustibles like cloth, while Class B fires involve flammable liquids.
- Class K fires pertain to cooking oils and fats, and Class C fires involve energized electrical equipment.
- The weight of CO2 is approximately one-and-a-half times that of air.
Operational Use and Safety
- The acronym PASS stands for Pull, Aim, Squeeze, and Sweep, guiding the operation of extinguishers.
- It is vital to always maintain an exit route when approaching a fire with an extinguisher.
- Using water is not recommended in certain situations where portable extinguishers are more effective.
Special Considerations
- A wetting agent added to water extinguishers enhances their penetration power.
- CO2 extinguishers leave no residue but are unsuitable in windy outdoor conditions.
- Dry chemical agents can handle various fire classes, but the specific agent must match the fuel type for Class D fires.
Conclusion
- Understanding the types, ratings, functions, and maintenance of fire extinguishers is essential for effective fire safety management.
- Proper extinguisher placement, operation techniques, and awareness of fire classes can greatly enhance safety protocols.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on fire extinguisher classes with these flashcards from Chapter 7. Each card presents crucial information about the usage and properties of different types of extinguishers. Perfect for anyone looking to enhance their fire safety skills.
