Chapter 6

Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident? Select one: a. Aqueous film forming foam (AFFF) extinguisher b. Stored-pressure water extinguisher c. Clean agent extinguisher d. Dry powder extinguisher

Aqueous film forming foam (AFFF) extinguisher

On which type of fires are stored-pressure water mist extinguishers safe and effective to use? Select one: a. Combustible metal fires b. Combustible cooking oil fires c. Class C d. Class B

Class C

A _____ extinguisher should be used in areas with highly sensitive computer equipment because it will cause less damage to the equipment than other extinguishers. Select one: a. Class D b. Carbon dioxide (CO2) c. Clean agent d. Class C

Clean agent

Which extinguishing agent should be used for a Class D fire? Select one: a. Wet chemical b. Class D foam c. Dry powder d. Dry chemical

Dry powder

In which situation would a dry chemical extinguisher be MOST effective? Select one: a. Fuel spill fire at a vehicle accident b. Titanium fire c. Magnesium fire d. Fire in a deep fryer at a restaurant

Fuel spill fire at a vehicle accident

Which material is a Class B fuel? Select one: a. Live electrical wires b. Gasoline c. Vegetable oil d. Lithium

Gasoline

What should be the next step after choosing the appropriate fire extinguisher for a fire? Select one: a. Refill the extinguisher so it is ready to operate. b. Inspect the extinguisher to make sure it is charged and operable. c. Pull the pin to break the seal. d. 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? Select one: a. Forms oxygen-excluding soapy foam surface on burning material b. Reduces burning material's temperature c. Interrupts the chemical chain reaction in the burning process d. Excludes oxygen from the burning process

Interrupts the chemical chain reaction in the burning process

_____ is an example of a Class D fuel. Select one: a. Gasoline b. Magnesium c. Animal fat d. Alcohol

Magnesium

Which statement about Class C fires is accurate? Select one: a. Once the electricity has been shut off to a Class C fire, it may be treated as a Class A or Class B fire. b. Class C fires should be extinguished using a specialized wet chemical system. c. Class C fires are rated from 1-C through 40-C and can be extinguished using a Class C extinguisher with the same rating. d. Class C fires contain combustible metals and alloys such as titanium, lithium, or magnesium.

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? Select one: a. After the fire diminishes, move farther away to achieve final extinguishment. b. Operating close to the fire can scatter solid fuel or penetrate the surface of liquid fuel. c. Liquid fuel fires should only be fought with one portable extinguisher at a time. d. 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? Select one: a. Particles of the agent may become airborne during application. b. Dry chemical agents must be applied using a shovel. c. Dry chemical extinguishers must be used in conjunction with foam. d. Dry chemical agents are extremely toxic to humans.

Particles of the agent may become airborne during application.

Which method of extinguishment excludes oxygen from the burning process? Select one: a. Smothering b. Saponification c. Cooling d. Chemical flame inhibition

Smothering

The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces: Select one: a. lower quality foam than a standard extinguisher nozzle. b. foam that is ideal for fighting Class D fires. c. higher quality foam than a standard extinguisher nozzle. d. foam that is ideal for fighting Class A fires.

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: Select one: a. include the test results on the faceplate. b. include application instructions on the faceplate. c. be a different color than extinguishers designed to extinguish other classes of fire. d. be given a numerical rating based upon the amount of fire it can extinguish.

include application instructions on the faceplate.

How would a fire containing plastics be classified? Select one: a. Class C b. Class A c. Class K d. Class D

Class A

Wet chemical stored-pressure extinguishers are intended for use on _____ fires. Select one: a. Class K b. Class A c. Class B d. Class D

Class K

Where would a clean agent extinguisher likely be used? Select one: a. Structure fire b. Commercial kitchen fire c. Vehicle fire d. Computer room fire

Computer room fire

What is the first step in the PASS application method of operating a portable fire extinguisher? Select one: a. Position downwind of the fire. b. Pull the pin to break the thin wire or plastic seal. c. Pick up the extinguisher and walk toward the fire. d. Point the nozzle at the top edge of the fire.

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

Pump-type water extinguishers are intended primarily for use on: Select one: a. energized electrical equipment. b. Class B fires. c. ground cover fires. d. Class D fires.

ground cover fires.

Class K rated extinguishers work because of _____, which converts fatty acids into a soapy film. Select one: a. cooling b. saponification c. smothering d. chemical flame inhibition

saponification

When selecting the appropriate type of portable fire extinguisher to use for a situation, it is important to consider: Select one: a. how many times the extinguisher has been refilled. b. the class of fuel that is burning. c. whether a foam agent is available. d. the time of day.

the class of fuel that is burning.

Portable fire extinguishers are classified according to the: Select one: a. certification level required to operate them. b. type of fire they are designed to extinguish. c. amount of time they have been in service. d. place where they were manufactured.

type of fire they are designed to extinguish.

When operating a portable fire extinguisher, it is safest to approach the fire: Select one: a. with the wind blowing toward you. b. with your back to the fire. c. with the wind at your back. d. at a 45-degree angle.

with the wind at your back.

Stored-pressure water extinguishers are used on Class _____ fires. Select one: a. D b. B c. A d. C

A

What is a characteristic of carbon dioxide (CO2) extinguishers? Select one: a. CO2 gas cools the fire to subzero temperatures b. Most effective in extinguishing Class D fires c. Require freeze protection due to icy discharge d. CO2 gas displaces oxygen to smother the fire

CO2 gas displaces oxygen to smother the fire

Which type of extinguishing agent is used to extinguish a Class B fire? Select one: a. Wet chemical b. Deionized water c. Dry powder d. Carbon dioxide

Carbon dioxide

What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness? Select one: a. Class D foam b. Dry powder c. Class A foam d. Dry chemical

Class A foam

What action should be taken if an entire extinguisher is discharged but the fire is not extinguished? Select one: a. Notify a supervisor and stand by for further instruction b. Try to use a different class of fire extinguisher c. Wait a moment and try another extinguisher of the same class d. Withdraw and reassess the situation

Withdraw and reassess the situation

When operating a portable fire extinguisher,: Select one: a. move the nozzle around in a circular pattern. b. aim the nozzle at the top of the fire. c. move the nozzle up and down near the center of the fire. d. aim the nozzle at the base of the fire.

aim the nozzle at the base of the fire.

When applying a dry powder agent, it is important to: Select one: a. only use a wheeled unit to apply the agent. b. avoid the ice crystals that form around the discharge nozzle. c. avoid breaking the crust that forms over the burning material. d. apply the agent as quickly and forcefully as possible.

avoid breaking the crust that forms over the burning material.

Class K fires involve: Select one: a. combustible metals. b. cooking oils. c. wood and paper products. d. energized electrical equipment.

cooking oils.

Class A portable fire extinguishers are rated from 1-A through 40-A based upon the amount of water and: Select one: a. the weight and height of the portable extinguisher. b. whether the portable extinguisher is intended for indoor or outdoor use. c. duration and range of discharge used in extinguishing test fires. d. whether the portable extinguisher is certified for novice use.

duration and range of discharge used in extinguishing test fires.

A portable fire extinguisher must be labeled with the: Select one: a. type of PPE required to be worn while operating. b. colors that designate its class rating. c. letters and/or symbols that designate its class rating. d. name of the purchasing department.

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. Select one: a. stored pressure b. manual pump c. pressure cartridge d. manual cartridge

manual pump