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Questions and Answers
Which class of fire involves combustible metals?
Which class of fire involves combustible metals?
D
What is one advantage of portable fire extinguishers over hose lines?
What is one advantage of portable fire extinguishers over hose lines?
They are quicker to deploy and use.
At which temperature are dry chemicals subject to freezing?
At which temperature are dry chemicals subject to freezing?
They are not subject to freezing.
What is the body of a portable fire extinguisher called?
What is the body of a portable fire extinguisher called?
What is the substance called that is contained in a portable fire extinguisher and puts out the fire?
What is the substance called that is contained in a portable fire extinguisher and puts out the fire?
What happens if normal extinguishing agents are tried on Class D fires?
What happens if normal extinguishing agents are tried on Class D fires?
What is another word for when a material begins to burn?
What is another word for when a material begins to burn?
What residue, if any, does a CO2 fire extinguisher leave when discharged?
What residue, if any, does a CO2 fire extinguisher leave when discharged?
What is the most common extinguishing agent for Class A fires?
What is the most common extinguishing agent for Class A fires?
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?
What can be added to water extinguishers to reduce the surface area of water to aid in extinguishment of fuels such as baled cotton or fibrous materials?
What can be added to water extinguishers to reduce the surface area of water to aid in extinguishment of fuels such as baled cotton or fibrous materials?
Which hazard category is represented by auto showrooms, parking garages, and retail stores?
Which hazard category is represented by auto showrooms, parking garages, and retail stores?
How many gallons of water are contained in a Class A Fire Extinguisher with a numeral rating of 2?
How many gallons of water are contained in a Class A Fire Extinguisher with a numeral rating of 2?
According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on:
According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on:
Non-rechargeable extinguishers must be replaced after any use.
Non-rechargeable extinguishers must be replaced after any use.
When approaching a fire with an extinguisher in hand, fire fighters should always have what behind them?
When approaching a fire with an extinguisher in hand, fire fighters should always have what behind them?
How are fires and fire extinguishers grouped?
How are fires and fire extinguishers grouped?
Is it ever appropriate to have two different types of fire extinguisher in the same area?
Is it ever appropriate to have two different types of fire extinguisher in the same area?
Firefighters use portable fire extinguishers to put out small fires that do not require the use of what?
Firefighters use portable fire extinguishers to put out small fires that do not require the use of what?
Which hazard category is represented by woodworking shops, service or repair facilities for cars, and cooking areas with deep fryers?
Which hazard category is represented by woodworking shops, service or repair facilities for cars, and cooking areas with deep fryers?
Bromochlorodifluoromethane should be recognized by firefighters as a certain type of extinguishing agent. Which agent?
Bromochlorodifluoromethane should be recognized by firefighters as a certain type of extinguishing agent. Which agent?
When should fire extinguishers on apparatus be inspected?
When should fire extinguishers on apparatus be inspected?
All portable fire extinguishers use what means for expelling their contents?
All portable fire extinguishers use what means for expelling their contents?
Besides putting out incipient fires, what is another use for portable fire extinguishers?
Besides putting out incipient fires, what is another use for portable fire extinguishers?
What, if anything, do the chemicals in multipurpose dry chemical extinguishers do to prevent rekindling of Class A materials?
What, if anything, do the chemicals in multipurpose dry chemical extinguishers do to prevent rekindling of Class A materials?
Why can dry chemical extinguishers be used on Class C fires?
Why can dry chemical extinguishers be used on Class C fires?
Why would a fire extinguisher class icon have a red slash through it?
Why would a fire extinguisher class icon have a red slash through it?
Which of the following is NOT an example of a light hazard environment?
Which of the following is NOT an example of a light hazard environment?
Class B foam extinguishers are not suitable for which particular type of flammable liquid fire?
Class B foam extinguishers are not suitable for which particular type of flammable liquid fire?
The classification system for fire extinguishers uses which two types of symbols?
The classification system for fire extinguishers uses which two types of symbols?
When determining what risk classification to assign a certain building area, which two factors contribute?
When determining what risk classification to assign a certain building area, which two factors contribute?
Fire extinguishers are rated for their ability to control a specific type of fire and:
Fire extinguishers are rated for their ability to control a specific type of fire and:
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?
Why is it dangerous to apply a stream of water to energized electrical equipment?
Why is it dangerous to apply a stream of water to energized electrical equipment?
The dry chemicals in fire extinguishers work in two ways. What is one of those ways?
The dry chemicals in fire extinguishers work in two ways. What is one of those ways?
Which class of fire is depicted in the pictograph system by a burning trash can beside a wood fire?
Which class of fire is depicted in the pictograph system by a burning trash can beside a wood fire?
Why is the use of halon agents strictly controlled?
Why is the use of halon agents strictly controlled?
Portable fire extinguishers have two primary uses. What is one?
Portable fire extinguishers have two primary uses. What is one?
What is one chemical used as a dry chemical extinguishing agent?
What is one chemical used as a dry chemical extinguishing agent?
Which class of fire involves ordinary combustibles, such as wood, paper, cloth, rubber, and some plastics?
Which class of fire involves ordinary combustibles, such as wood, paper, cloth, rubber, and some plastics?
What is one disadvantage of CO2 extinguishers?
What is one disadvantage of CO2 extinguishers?
What is the significance of the C in the following fire extinguisher rating? 2-A:10-B:C
What is the significance of the C in the following fire extinguisher rating? 2-A:10-B:C
What is the weight of carbon dioxide in comparison to air?
What is the weight of carbon dioxide in comparison to air?
For an area to qualify for the classification of light hazard, most of the combustibles present must meet one of two requirements. What is one of those?
For an area to qualify for the classification of light hazard, most of the combustibles present must meet one of two requirements. What is one of those?
What is one disadvantage of CO2 extinguishers compared to other extinguishers?
What is one disadvantage of CO2 extinguishers compared to other extinguishers?
Which class of fire involves combustible cooking oils and fats?
Which class of fire involves combustible cooking oils and fats?
How is the numerical rating of Class K portable fire extinguishers assigned, if there is such a rating?
How is the numerical rating of Class K portable fire extinguishers assigned, if there is such a rating?
Which class of fire is depicted on the pictograph system by a flame and an electrical plug and socket?
Which class of fire is depicted on the pictograph system by a flame and an electrical plug and socket?
A Class B extinguisher with a rating of 40-B would be expected to extinguish which size flammable liquid surface fire?
A Class B extinguisher with a rating of 40-B would be expected to extinguish which size flammable liquid surface fire?
Which statement accurately describes how relatively easy or hard it would be for a trained person to extinguish a fire in a wastebasket, with a suitable portable fire extinguisher?
Which statement accurately describes how relatively easy or hard it would be for a trained person to extinguish a fire in a wastebasket, with a suitable portable fire extinguisher?
Fire prevention programs encourage citizens to keep fire extinguishers in their homes, especially in the:
Fire prevention programs encourage citizens to keep fire extinguishers in their homes, especially in the:
Which NFPA Standard lists the requirements for placing and mounting portable fire extinguishers?
Which NFPA Standard lists the requirements for placing and mounting portable fire extinguishers?
What is the safest and surest way to extinguish a Class C fire?
What is the safest and surest way to extinguish a Class C fire?
What is the range of a 2.5-gallon water extinguisher expelled in a solid stream?
What is the range of a 2.5-gallon water extinguisher expelled in a solid stream?
How are occupancy use category and hazard classification related, if at all?
How are occupancy use category and hazard classification related, if at all?
Which traditional letter label is represented by a red square?
Which traditional letter label is represented by a red square?
What is the term for water-soluble flammable liquids such as alcohols, acetone, and others?
What is the term for water-soluble flammable liquids such as alcohols, acetone, and others?
What is generally the maximum distance a CO2 extinguisher can be expected to reach?
What is generally the maximum distance a CO2 extinguisher can be expected to reach?
Light hazard environments usually contain a limited amount of combustibles of which class?
Light hazard environments usually contain a limited amount of combustibles of which class?
What is the test used to measure the ability of a cylinder to withstand internal pressure?
What is the test used to measure the ability of a cylinder to withstand internal pressure?
Select the true statement regarding Class A and Class B foam fire extinguishers and their use on the unintended class of fire.
Select the true statement regarding Class A and Class B foam fire extinguishers and their use on the unintended class of fire.
For an area to qualify as a light hazard, the majority of materials must meet one of two requirements. What is one of those?
For an area to qualify as a light hazard, the majority of materials must meet one of two requirements. What is one of those?
What is one extinguishing agent that will not conduct electricity?
What is one extinguishing agent that will not conduct electricity?
Does it matter which type of dry powder extinguisher is used on which type of burning metal?
Does it matter which type of dry powder extinguisher is used on which type of burning metal?
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?
What is an advantage of portable fire extinguishers?
What is an advantage of portable fire extinguishers?
When operating a fire extinguisher, the acronym PASS can be used to assist you in the steps. What does the acronym stand for?
When operating a fire extinguisher, the acronym PASS can be used to assist you in the steps. What does the acronym stand for?
What one characteristic makes an extinguishing agent suitable for fighting Class C fires?
What one characteristic makes an extinguishing agent suitable for fighting Class C fires?
If a fire extinguisher containing ammonium phosphate is used on a Class K fire, not only will it be ineffective, but it can actually worsen the problem. How?
If a fire extinguisher containing ammonium phosphate is used on a Class K fire, not only will it be ineffective, but it can actually worsen the problem. How?
Which class of fire would involve energized building wiring, fuse boxes, transformers, or generators?
Which class of fire would involve energized building wiring, fuse boxes, transformers, or generators?
Do fire apparatuses usually carry portable fire extinguishers?
Do fire apparatuses usually carry portable fire extinguishers?
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?
What is the relationship, if any, between dry powder and dry chemical extinguishing agents?
What is the relationship, if any, between dry powder and dry chemical extinguishing agents?
All fires require three basic ingredients, one of which is fuel. What is another?
All fires require three basic ingredients, one of which is fuel. What is another?
Which class of fire involves flammable or combustible liquids?
Which class of fire involves flammable or combustible liquids?
Which classes of fire extinguisher include a number in their classification?
Which classes of fire extinguisher include a number in their classification?
Study Notes
Fire Classes and Extinguishing Agents
- Class D fires involve combustible metals that can ignite and burn.
- The most common extinguishing agent for Class A fires is water.
- Carbon Dioxide (CO2) fire extinguishers do not leave any residue upon discharge.
- Dry chemicals do not conduct electricity, making them suitable for Class C fires.
Functionality and Use of Extinguishers
- Portable fire extinguishers are quick to deploy compared to hose lines, enhancing emergency response.
- The expulsion of contents in all portable fire extinguishers is accomplished through pressure.
- Fire extinguishers are rated for their ability to control specific fire types and to prevent rekindling.
- An extinguisher's numerical rating reflects the amount of flammable material it can handle (e.g., a Class A extinguisher with a numeral rating of 2 contains 2.5 gallons of water).
Fire Extinguisher Composition
- The cylinder is the body of a portable fire extinguisher.
- The substance contained in extinguishers that puts out fires is called the extinguishing agent.
- Ammonium phosphate is an example of a chemical used as a dry chemical extinguishing agent.
Safety and Procedures
- NFPA 10 lists requirements for placing and mounting portable fire extinguishers.
- The safest way to extinguish a Class C fire is to turn off the power and treat it as a Class A or B fire.
- To approach a fire safely, firefighters should always have an exit behind them.
Limitations and Risks
- It is dangerous to apply water on energized electrical equipment due to the risk of electrical conduction.
- Class B foam extinguishers are unsuitable for cooking oil fires, which are classified as Class K.
- Normal extinguishing agents should not be used on Class D fires, as they may react violently.
Extinguisher Maintenance
- Non-rechargeable extinguishers must be replaced after any use to ensure effectiveness.
- Regular inspections of fire extinguishers are crucial along with apparatus equipment checks.
Fire Hazard Classification
- Occupancy type influences the maximum floor area that can be protected by extinguishers.
- Light hazard environments typically contain a limited amount of ordinary combustibles.
- There are specific classifications for fire extinguishers to identify their appropriate use, indicated by letters and numbers.
Miscellaneous
- Dry powder agents are marked for use on specific combustible metal fires, differentiating them from ordinary extinguishing agents.
- The acronym PASS (Pull, Aim, Squeeze, Sweep) is a guideline for operating fire extinguishers effectively.
- The C rating in fire extinguishers indicates suitability for use on energized electrical equipment.
Summarized Topics
- Classifications: Classes A, B, C, D, and K cover various combustibles.
- Benefits of Portability: Portable extinguishers offer an advantage in terms of ease of transportation and rapid deployment.
- Inspection and Safety Guidelines: Adhering to NFPA standards and conducting regular checks are vital for effective fire safety.
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Test your knowledge on portable fire extinguishers with these flashcards. This quiz covers various topics including classes of fire, advantages of extinguishers, and more. Perfect for fire safety training or review.
