Fire Safety Chapter 6 Homework

Questions and Answers

Portable fire extinguishers are classified according to the?

Place where they are designed to extinguish

A portable fire extinguisher must be labeled with the?

Letters and/or symbols that designate its class rating

How would a fire containing plastics be classified?

Class A

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 Signup and view all the answers

Which material is Class B fuel?

Gasoline Signup and view all the answers

Which type of extinguishing agent is used to extinguish a Class B fire?

Carbon dioxide Signup and view all the answers

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 Signup and view all the answers

_____ is an example of a Class D fuel.

Magnesium Signup and view all the answers

Which extinguishing agent should be used for a Class D fire?

Dry powder Signup and view all the answers

When an extinguishing agent is determined to be safe and effective for use on combustible metals, it will?

Include application instructions on the faceplate Signup and view all the answers

Class K fires involve?

Cooking oils Signup and view all the answers

Class K rated extinguishers work because of _______, which converts fatty acids into a soapy film.

Saponification Signup and view all the answers

Which method of extinguishment excludes oxygen from the burning process?

Smothering Signup and view all the answers

How does chemical flame inhibition work to extinguish fire?

Interrupts the chemical chain reaction in the burning process Signup and view all the answers

A ______ extinguisher requires the operator to apply pressure to a pump that increases pressure within the container and forces the agent out of the nozzle.

Manual pump Signup and view all the answers

Pump-type water extinguishers are intended primarily for use on?

Ground cover fires Signup and view all the answers

Stored-pressure water extinguishers are used on Class _____ fires.

A Signup and view all the answers

What do manufacturers sometimes add to stored-pressure water extinguishers in order to increase their effectiveness?

Class A foam Signup and view all the answers

On which type of fires are stored-pressure water-mist extinguishers safe and effective to use?

Class C Signup and view all the answers

Wet chemical stored-pressure extinguishers are intended for use on ___ fires.

Class K Signup and view all the answers

Which extinguisher would be effective for use on a burning puddle of gasoline at a vehicle incident?

Aqueous film forming foam (AFFF) extinguisher Signup and view all the answers

The air-aspirating foam nozzle used with an aqueous film forming foam (AFFF) extinguisher produces?

Higher quality foam than a standard extinguisher nozzle Signup and view all the answers

Where would a clean agent extinguisher likely be used?

Computer room fire Signup and view all the answers

What is a characteristic of a carbon dioxide (CO2) extinguisher?

CO2 gas displaces oxygen to smother the fire Signup and view all the answers

In which situation would a dry chemical extinguisher be most effective?

Fuel spill fire at a vehicle accident Signup and view all the answers

Which statement about dry chemical extinguishers is accurate?

Particles of the agent may become airborne during application Signup and view all the answers

When applying a dry powder agent, it is important to?

Avoid breaking the crust that forms over the burning material Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

When operating a portable fire extinguisher, it is safest to approach the fire?

With the wind at your back Signup and view all the answers

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 Signup and view all the answers

When operating a portable fire extinguisher?

Aim the nozzle at the base of the fire Signup and view all the answers

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 Signup and view all the answers

What action should be taken if an entire extinguisher is discharged but the fire is not extinguished?

Withdraw and reassess the situation Signup and view all the answers

Study Notes

Portable Fire Extinguishers

Classified based on the type of fire they are designed to extinguish.
Must display letters/symbols indicating class rating for clear identification.

Fire Classifications

Class A fires involve ordinary combustibles like plastics and wood.
Class B fires include flammable liquids, such as gasoline.
Class C fires pertain to fires involving electrical equipment and may revert to Class A or B once power is disconnected.
Class D fires involve combustible metals, such as magnesium.
Class K fires are related to cooking oils.

Extinguishing Agents

Class A extinguishers are rated 1-A to 40-A based on water effectiveness in tests.
Carbon dioxide is the effective agent for Class B fires.
Dry powder is used specifically for Class D fires.
Class K extinguishers utilize saponification to turn fatty acids into a soapy film for effective suppression.
Clean agents are useful in sensitive environments like computer rooms as they minimize damage.

Operating Procedures

Smothering is an effective method that excludes oxygen from the fire.
Chemical flame inhibition interrupts the chemical chain reaction, aiding in fire suppression.
Manual pump extinguishers require user-operated pressure to expel the agent.

Specific Extinguisher Types

Stored-pressure water extinguishers target Class A fires, sometimes enhanced with Class A foam for better effectiveness.
Wet chemical stored-pressure extinguishers are designated for Class K fires.
Aqueous Film Forming Foam (AFFF) extinguishers are suitable for gasoline-related incidents.

Important Considerations

Examine the class of fuel burning to select the proper extinguisher.
Ensure extinguishers are charged and operational before use.
Approach fires with wind at your back for safety.
Follow the PASS method: Pull the pin, Aim the nozzle, Squeeze the handle, and Sweep side to side.

Safety Precautions

Be cautious as dry chemical particles may scatter during application.
Avoid breaking through any crust formed on burning materials when using a dry powder agent.
If a discharged extinguisher fails to extinguish the fire, withdraw and reassess the situation.

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