Chapter 6- Extinguishers

Stored-pressure water extinguishers are used on Class ______ fires. (260) [4.3.16] A B C D

A

Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident? (261) [4.3.16] Aqueous film forming foam (AFFF) extinguisher Stored-pressure water extinguisher Clean agent extinguisher Dry powder extinguisher

Aqueous film forming foam (AFFF) extinguisher

What is a characteristic of carbon dioxide (C02) extinguishers? (262) [4.3.16] C02 gas displaces oxygen to smother the fire Most effective in extinguishing Class D fires Require freeze protection due to icy discharge C02 gas cools the fire to subzero temperatures

C02 gas displaces oxygen to smother the fire

Which type of extinguishing agent is used to extinguish a Class B fire? (256) [4.3.16] Carbon dioxide Wet chemical Dry powder Deionized water

Carbon dioxide

How would a fire containing plastics be classified? (255) [4.3.16] Class A Class C Class D Class K

Class A

What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness? (261) [4.3.16] Class A foam Dry chemical Dry powder Class D foam

Class A foam

On which type of fires are stored-pressure water-mist extinguishers safe and effective to use? (261) [4.3.16] Class C Class B Combustible metal fires Combustible cooking oil fires

Class C

Wet chemical stored-pressure extinguishers are intended for use on ______ fires. (261) [4.316] Class K Class A Class C Class D

Class K

A ______ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers. (266) [4.3.16] Clean agent Class D class C Carbon dioxide (C02)

Clean agent

Where would a clean agent extinguisher likely be used? (262) [4.3.16] Computer room fire Structure fire Vehicle fire Commercial kitchen fire

Computer room fire

Which extinguishing agent should be used for a Class D fire? (257) [4.3.16] Dry powder Dry chemical Wet chemical Class D foam

Dry powder

In which situation would a dry chemical extinguisher be MOST effective? (262) [4.3.16] Fuel spill fire at a vehicle accident Titanium fire Magnesium fire Fire in a deep fryer at a restaurant

Fuel spill fire at a vehicle accident

Which material is a Class B fuel? (256) [4.3.16] Gasoline Lithium Vegetable oil Live electrical wires

Gasoline

What should be the next step after choosing the appropriate fire extinguisher for a fire? (267) [4.3.16] Inspect the extinguisher to make sure it is charged and operable. Pull the pin to break the seal. Refill the extinguisher so it is ready to operate. Pick up the extinguisher and carry it toward the fire.

Inspect the extinguisher to make sure it is charged and operable.

How does chemical flame inhibition work to extinguish fire? (258) [4.3.16] Interrupts the chemical chain reaction in the burning process Reduces burning material's temperature Excludes oxygen from the burning process Forms oxygen-excluding soapy foam surface on burning material

Interrupts the chemical chain reaction in the burning process

______ is an example of a Class D fuel. (256) [4.3.16] Magnesium Animal fat Gasoline Alcohol

Magnesium

Which statement about Class C fires is accurate? (256) [4.3.16] 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 C fires are rated from I-C through 40-C and can be extinguished using a Class C extinguisher with the same rating. Class C fires contain combustible metals and alloys such as titanium, lithium, or magnesium. Class C fires should be extinguished using a specialized wet chemical system.

Once the electricity has been shut off to a Class C fire, it may be treated as a Class A or Class B fire.

Which statement about using a portable fire extinguisher on an incipient stage fire is accurate? (268) [4.316] Operating close to the fire can scatter solid fuel or penetrate the surface of liquid fuel. After the fire diminishes, move farther away to achieve final extinguishment. Liquid fuel fires should only be fought with one portable extinguisher at a time. In order to stop the flow of the extinguishing agent, the pin must be put back in place.

Operating close to the fire can scatter solid fuel or penetrate the surface of liquid fuel.

Which statement about dry chemical extinguishers is accurate? (262) [4.3.16] Particles of the agent may become airborne during application. Dry chemical extinguishers must be used in conjunction with foam. Dry chemical agents are extremely toxic to humans. Dry chemical agents must be applied using a shovel.

Particles of the agent may become airborne during application.

What is the first step in the PASS application method of operating a portable fire extinguisher? (267) [4.3.16] Pull the pin to break the thin wire or plastic seal. Point the nozzle at the top edge of the fire. Position downwind of the fire. Pick up the extinguisher and walk toward the fire.

Pull the pin to break the thin wire or plastic seal.

Class K rated extinguishers work because of ______, which converts fatty acids into a soapy film. (258) [4.3.16] Saponification Smothering Cooling Chemical flame inhibition

Saponification

Which method of extinguishment excludes oxygen from the burning process? (258) [4.3.16] Smothering Cooling Saponification Chemical flame inhibition

Smothering

What action should be taken if an entire extinguisher is discharged but the fire is not extinguished? (268) [4.3.16] Withdraw and reassess the situation Try to use a different class of fire extinguisher Notify a supervisor and stand by for further instruction Wait a moment and try another extinguisher of the same class

Withdraw and reassess the situation

When operating a portable fire extinguisher,: (267) [4.3.16] aim the nozzle at the base of the fire. aim the nozzle at the top of the fire. move the nozzle around in the circular pattern. move the nozzle up and down near the center of the fire.

aim the nozzle at the base of the fire.

When applying a dry powder agent, it is important to: (266) [4.3.16] avoid breaking the crust that forms over the burning material. only use a wheeled unit to apply the agent. apply the agent as quickly and forcefully as possible. avoid the ice crystals that form around the discharge nozzle.

avoid breaking the crust that forms over the burning material.

Class K fires involve: (258) [4.3.16] cooking oils. combustible metals. wood and paper products. energized electrical equipment.

cooking oils.

Class A portable fire extinguishers are rated from I-A through 40-A based upon the amount of water and: (255) [4.3.16] duration and range of discharge used in extinguishing test fires. whether the portable extinguisher is certified for novice use. the weight and height of the portable extinguisher. whether the portable extinguisher is intended for indoor or outdoor use.

duration and range of discharge used in extinguishing test fires.

Pump-type water extinguishers are intended primarily for use on: (260) [4.3.16] ground cover fires. Class D fires. Class B fires. energized electrical equipment.

ground cover fires.

The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces: (262) [4.3.16] higher quality foam than a standard extinguisher nozzle. foam that is ideal for fighting Class A fires. foam that is ideal for fighting Class D fires. lower quality foam than a standard extinguisher nozzle.

higher quality foam than a standard extinguisher nozzle.

When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will: (257) [4.3.16] include application instructions on the faceplate. include the test results on the faceplate. be a different color than extinguishers designed to extinguish other classes of fire. be given a numerical rating based upon the amount of fire it can extinguish.

include application instructions on the faceplate.

A portable fire extinguisher must be labeled with the: (254) [4.3.16] letters and/or symbols that designate its class rating. type of PPE required to be worn while operating. name of the purchasing department. colors that designate its class rating.

letters and/or symbols that designate its class rating.

A ______ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out the nozzle. (260) [4.3.16] manual pump stored pressure manual cartridge pressure cartridge

manual pump

When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider: (266) [4.3.16] the class of fuel that is burning. the time of day. whether a foam agent is available. how many times the extinguisher has been refilled.

the class of fuel that is burning.

Portable fire extinguishers are classified according to the: (254) [4.3.16] type of fire they are designed to extinguish. place where they were manufactured. amount of time they have been in service. certification level required to operate them.

type of fire they are designed to extinguish.

When operating a portable fire extinguisher, it is safest to approach the fire: (267) [4.3.16] with the wind at your back. with your back to the fire. at a 45-degree angle. with the wind blowing toward you.

with the wind at your back.