FF1 Chapter 6 Portable Fire
Extinguishers IFSTA
After selecting the appropriate extinguisher to use on a fire, the firefighter should: visually
inspect the extinguisher.
Wet chemical stored-pressure extinguishers are intended for use on _____ fires. Class K
What types of materials do Class B fires involve? Combustible liquids and gases
What is a characteristic of carbon dioxide (CO2) extinguishers? CO2 gas displaces oxygen to
smother the fire
How does chemical flame inhibition work to extinguish fire? Interrupts the chemical chain
reaction in the burning process
Which type of extinguishing agent is used to extinguish a Class B fire? Carbon dioxide
When applying a dry powder agent, it is important to: avoid breaking the crust that forms
over the burning material.
Which material is a Class A combustible material? Wood, plastic, paper
What is a problem with wind when using a portable fire extinguisher? Wind can limit the
reach of the extinguishing agent after it is expelled.
On which type of fires are stored-pressure water mist extinguishers safe and effective to use?
Class C
Which type of extinguisher is intended to be used on a Class B fire? Aqueous film forming
foam extinguisher
Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of
water and: duration and range of discharge used in extinguishing test fires.
Which statement about using a portable fire extinguisher on an incipient stage fire is accurate?
Operating close to the fire can scatter solid fuel or penetrate the surface of liquid fuel.
Stored-pressure water extinguishers are used on Class _____ fires. A
How would a fire containing plastics be classified? Class A
Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle
incident? Aqueous film forming foam (AFFF) extinguisher
Class C fires involve: energized electrical equipment.
When in position to attack the fire, what is the first step that should be taken when using a
portable fire extinguisher? Pull the pin and break the wire or seal.
In a(an) _____ extinguisher, compressed air or inert gas within the container forces the agent out
of the extinguisher nozzle when the operator presses the handle. stored-pressure
Which factor should be considered when selecting the appropriate type of extinguisher to use on
a given fire? Classification of the burning fuel
A Class D fire should be extinguished using a: dry powder extinguisher.
Where is a Class K fire likely to be found? Restaurant
Which method of fire extinguishment forms an oxygen-excluding soapy foam over the surface of
the burning material? saponification
The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher
produces: higher quality foam than a standard extinguisher nozzle.
, What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase
their effectiveness? Class A foam
Every portable fire extinguisher must be labeled with: letters and/or symbols that identify
the type of fire for which it is intended.
A portable fire extinguisher must be labeled with the: letters and/or symbols that designate
its class rating.
Which is a Class D combustible material? Sodium
An empty portable fire extinguisher should be: laid on its side.
When selecting the appropriate type of portable fire extinguisher to use for a situation, it is
important to consider: the class of fuel that is burning.
A _____ extinguisher requires the operator to apply pressure to a pump that increases pressure
within the container and forces the agent out the nozzle. manual pump
Which material is a Class B fuel? Gasoline
Which statement about dry chemical extinguishers is accurate? Particles of the agent may
become airborne during application.
What should be the next step after choosing the appropriate fire extinguisher for a fire? Inspect
the extinguisher to make sure it is charged and operable.
_____ is an example of a Class D fuel. Magnesium
A _____ extinguisher should be used in areas with highly sensitive computer equipment because
it will cause less damage to the equipment than other extinguishers. Clean agent
In which situation would a dry chemical extinguisher be MOST effective? Fuel spill fire at a
vehicle accident
When operating a portable fire extinguisher,:Aim the nozzle at the base of the fire.
Class K fires involve: cooking oils.
Which method of extinguishment excludes oxygen from the burning process? Smothering
Portable fire extinguishers are classified according to the: type of fire they are designed to
extinguish.
When an extinguishing agent is determined to be safe and effective for use on combustible
metals, it will: include application instructions on the faceplate.
Which extinguishing agent should be used for a Class D fire? Dry powder
When operating a portable fire extinguisher, it is safest to approach the fire: with the wind
at your back.
Where would a clean agent extinguisher likely be used? Computer room fire
What is the first step in the PASS application method of operating a portable fire extinguisher?
Pull the pin to break the thin wire or plastic seal.
Which statement about Class C fires is accurate? Once the electricity has been shut off to a
Class C fire, it may be treated as a Class A or Class B fire.
Class K rated extinguishers work because of _____, which converts fatty acids into a soapy film.
saponification
What action should be taken if an entire extinguisher is discharged but the fire is not
extinguished? Withdraw and reassess the situation
Pump-type water extinguishers are intended primarily for use on: ground cover fires.
True or false: Portable fire extinguishers are often suitable for more than one class of fire. True
C1ass c extinguishing agents will not __________________ Conduct electricity
A portable fire extinguisher should be used only for:the fire type or types for which it is
intended.
Extinguishers IFSTA
After selecting the appropriate extinguisher to use on a fire, the firefighter should: visually
inspect the extinguisher.
Wet chemical stored-pressure extinguishers are intended for use on _____ fires. Class K
What types of materials do Class B fires involve? Combustible liquids and gases
What is a characteristic of carbon dioxide (CO2) extinguishers? CO2 gas displaces oxygen to
smother the fire
How does chemical flame inhibition work to extinguish fire? Interrupts the chemical chain
reaction in the burning process
Which type of extinguishing agent is used to extinguish a Class B fire? Carbon dioxide
When applying a dry powder agent, it is important to: avoid breaking the crust that forms
over the burning material.
Which material is a Class A combustible material? Wood, plastic, paper
What is a problem with wind when using a portable fire extinguisher? Wind can limit the
reach of the extinguishing agent after it is expelled.
On which type of fires are stored-pressure water mist extinguishers safe and effective to use?
Class C
Which type of extinguisher is intended to be used on a Class B fire? Aqueous film forming
foam extinguisher
Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of
water and: duration and range of discharge used in extinguishing test fires.
Which statement about using a portable fire extinguisher on an incipient stage fire is accurate?
Operating close to the fire can scatter solid fuel or penetrate the surface of liquid fuel.
Stored-pressure water extinguishers are used on Class _____ fires. A
How would a fire containing plastics be classified? Class A
Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle
incident? Aqueous film forming foam (AFFF) extinguisher
Class C fires involve: energized electrical equipment.
When in position to attack the fire, what is the first step that should be taken when using a
portable fire extinguisher? Pull the pin and break the wire or seal.
In a(an) _____ extinguisher, compressed air or inert gas within the container forces the agent out
of the extinguisher nozzle when the operator presses the handle. stored-pressure
Which factor should be considered when selecting the appropriate type of extinguisher to use on
a given fire? Classification of the burning fuel
A Class D fire should be extinguished using a: dry powder extinguisher.
Where is a Class K fire likely to be found? Restaurant
Which method of fire extinguishment forms an oxygen-excluding soapy foam over the surface of
the burning material? saponification
The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher
produces: higher quality foam than a standard extinguisher nozzle.
, What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase
their effectiveness? Class A foam
Every portable fire extinguisher must be labeled with: letters and/or symbols that identify
the type of fire for which it is intended.
A portable fire extinguisher must be labeled with the: letters and/or symbols that designate
its class rating.
Which is a Class D combustible material? Sodium
An empty portable fire extinguisher should be: laid on its side.
When selecting the appropriate type of portable fire extinguisher to use for a situation, it is
important to consider: the class of fuel that is burning.
A _____ extinguisher requires the operator to apply pressure to a pump that increases pressure
within the container and forces the agent out the nozzle. manual pump
Which material is a Class B fuel? Gasoline
Which statement about dry chemical extinguishers is accurate? Particles of the agent may
become airborne during application.
What should be the next step after choosing the appropriate fire extinguisher for a fire? Inspect
the extinguisher to make sure it is charged and operable.
_____ is an example of a Class D fuel. Magnesium
A _____ extinguisher should be used in areas with highly sensitive computer equipment because
it will cause less damage to the equipment than other extinguishers. Clean agent
In which situation would a dry chemical extinguisher be MOST effective? Fuel spill fire at a
vehicle accident
When operating a portable fire extinguisher,:Aim the nozzle at the base of the fire.
Class K fires involve: cooking oils.
Which method of extinguishment excludes oxygen from the burning process? Smothering
Portable fire extinguishers are classified according to the: type of fire they are designed to
extinguish.
When an extinguishing agent is determined to be safe and effective for use on combustible
metals, it will: include application instructions on the faceplate.
Which extinguishing agent should be used for a Class D fire? Dry powder
When operating a portable fire extinguisher, it is safest to approach the fire: with the wind
at your back.
Where would a clean agent extinguisher likely be used? Computer room fire
What is the first step in the PASS application method of operating a portable fire extinguisher?
Pull the pin to break the thin wire or plastic seal.
Which statement about Class C fires is accurate? Once the electricity has been shut off to a
Class C fire, it may be treated as a Class A or Class B fire.
Class K rated extinguishers work because of _____, which converts fatty acids into a soapy film.
saponification
What action should be taken if an entire extinguisher is discharged but the fire is not
extinguished? Withdraw and reassess the situation
Pump-type water extinguishers are intended primarily for use on: ground cover fires.
True or false: Portable fire extinguishers are often suitable for more than one class of fire. True
C1ass c extinguishing agents will not __________________ Conduct electricity
A portable fire extinguisher should be used only for:the fire type or types for which it is
intended.
