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Questions and Answers
Portable fire extinguishers are classified according to the:
Portable fire extinguishers are classified according to the:
A portable fire extinguisher must be labeled with the:
A portable fire extinguisher must be labeled with the:
How would a fire containing plastics be classified?
How would a fire containing plastics be classified?
Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and:
Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and:
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What material is a Class B fuel?
What material is a Class B fuel?
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Which type of extinguishing agent is used to extinguish Class B fire?
Which type of extinguishing agent is used to extinguish Class B fire?
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Which statement about Class C fires is accurate?
Which statement about Class C fires is accurate?
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Which is an example of Class D fuel?
Which is an example of Class D fuel?
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Which extinguishing agent should be used for Class D fire?
Which extinguishing agent should be used for Class D fire?
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When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will:
When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will:
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Class K fires involve:
Class K fires involve:
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Class K rated extinguishers work because of ___, which converts fatty acids into a soapy film.
Class K rated extinguishers work because of ___, which converts fatty acids into a soapy film.
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Which method of extinguishment excludes oxygen from the burning process?
Which method of extinguishment excludes oxygen from the burning process?
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How does chemical flame inhibition work to extinguish fire?
How does chemical flame inhibition work to extinguish fire?
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A ___ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out the nozzle.
A ___ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out the nozzle.
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Pump-type water extinguishers are intended primarily for use on:
Pump-type water extinguishers are intended primarily for use on:
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Stored pressure water extinguishers are used on Class ___ fires.
Stored pressure water extinguishers are used on Class ___ fires.
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What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness?
What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness?
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On which type of fires are stored pressure water-mist extinguishers safe and effective to use?
On which type of fires are stored pressure water-mist extinguishers safe and effective to use?
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Wet chemical stored pressure extinguishers are intended for use on fires:
Wet chemical stored pressure extinguishers are intended for use on fires:
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Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident?
Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident?
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The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces:
The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces:
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Where would a clean agent extinguisher likely be used?
Where would a clean agent extinguisher likely be used?
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What is a characteristic of carbon dioxide (CO2) extinguishers?
What is a characteristic of carbon dioxide (CO2) extinguishers?
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In which situation would a dry chemical extinguisher be MOST effective?
In which situation would a dry chemical extinguisher be MOST effective?
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Which statement about dry chemical extinguishers is accurate?
Which statement about dry chemical extinguishers is accurate?
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When applying a dry powder agent, it is important to:
When applying a dry powder agent, it is important to:
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When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider:
When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider:
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A ___ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers.
A ___ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers.
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What should be the next step after choosing the appropriate fire extinguisher for a fire?
What should be the next step after choosing the appropriate fire extinguisher for a fire?
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When operating a portable fire extinguisher, it is safest to approach the fire:
When operating a portable fire extinguisher, it is safest to approach the fire:
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What is the first step in the PASS application method of operating a portable fire extinguisher?
What is the first step in the PASS application method of operating a portable fire extinguisher?
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When operating a portable fire extinguisher:
When operating a portable fire extinguisher:
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Which statement about using a portable fire extinguisher on an incipient stage fire is accurate?
Which statement about using a portable fire extinguisher on an incipient stage fire is accurate?
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What action should be taken if an entire extinguisher is discharged but the fire is not extinguished?
What action should be taken if an entire extinguisher is discharged but the fire is not extinguished?
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Study Notes
Fire Extinguishers Classification
- Portable fire extinguishers are classified based on the type of fire they extinguish.
- Extinguishers must be labeled with letters and symbols indicating their class rating.
Fire Classes
- Class A fires involve materials like plastics, wood, and paper products.
- Class B fires pertain to flammable liquids such as gasoline and oils.
- Class C fires include energized electrical equipment and should be treated as Class A or B post deactivation.
- Class D fires involve combustible metals such as magnesium.
- Class K fires are related to cooking oils and fats.
Extinguishing Agents
- Class A extinguishers are rated from 1-A to 40-A based on test discharge duration and range.
- Carbon dioxide is effective for Class B fires by smothering and displacing oxygen.
- Dry powder is the suitable agent for Class D fires.
- Wet chemical extinguishers utilize saponification to tackle Class K fires.
Extinguishing methods
- Smothering removes oxygen from the fire's process.
- Chemical flame inhibition interrupts the reaction chain in burning materials.
Portable Extinguisher Operation
- Manual pump extinguishers require operator pressure for discharge.
- Stored pressure water extinguishers are effective on Class A fires.
- Manufacturers sometimes enhance stored-pressure water extinguishers with Class A foam for increased efficacy.
Specific Extinguisher Applications
- Aqueous film forming foam (AFFF) extinguishers are good for flammable liquid fires.
- Stored pressure water-mist extinguishers are safe for Class C fires.
- Clean agent extinguishers minimize damage to sensitive electrical equipment in computer rooms.
Operating Procedures
- Inspect extinguishers for charge and operability before use.
- Approach a fire with the wind at your back for safety.
- Follow the PASS method: Pull the pin, Aim at the base of the fire, Squeeze the handle, Sweep the nozzle.
Safety Considerations
- Operating too close to a fire can spread solid fuels or penetrate liquid surfaces.
- If an extinguisher is discharged and the fire persists, withdraw and reassess the situation.
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Description
Test your knowledge on fire classes and extinguishers with this quiz based on IFSTA Chapter 6. This chapter covers the different types of portable fire extinguishers and their classifications. Prepare to enhance your understanding of fire safety and extinguishing methods!
