Chapter 8 Portable Fire Extinguishers

Requirements for placing and mounting portable fire extinguishers are sound in NFPA

10

A Class A fire extinguisher with a numerical rating of 2 contains __ gallon of water

2.5

The hydrostatic test interval for a dry chemical extinguisher with a stainless steel shell is every __ years

5

In general , the maximum reach of CO2 extinguisher is __ feet

8

Which class of fire extinguisher includes a number in its classification

A

Which class of fire includes cloth

A

Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire

A

Which compound is added to a water extinguisher to improve penetration of fuel

A wetting agent

How do multipurpose dry chemical agents prevent rekindling of Class A fuel

By forming a crust over the fuel

Which class of fire depicted in the pictograph system by a flame and an electrical plug and socket

C

Which class of fire involves energized electrical equipment

C

Which extinguishing agent i suitable for use on a class C fire

Carbon dioxide

Which fire extinguishing agent is best for use on sensitive electronic equiment

Carbon dioxide

Which statement about foam fire extinguishers is correct

Class B foam extinguisher may be used to some effect on Class A fires

What is used to pressurize a stored-pressure water extinguisher

Compressed air

A Class B foam extinguisher is not rated for which fuel

Cooking oil

Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid

Cutting off the oxygen supply

Which class of fire involves combustible metals

D

What is the difference between dry powder and dry chemical extinguishing agents

Each is rated for a different class of fire

What is the term for the substance that puts out the fire

Extinguishing agent

What is an advantage of portable fire extinguishers over hose lines

Faster deployment

A portable fire extinguisher is bested suited for which situation

Fire in a wastebasket

What is the primary extinguishing mechanism of dry chemical agent

Interrupting the chemical chain reaction

Which class of fire involves combustible cooking oils and fats

K

Which class of fire is depicted in the pictograph system by a fire in a frying pan

K

If a private residence has a single fire extinguisher, where should it be located

Kitchen

Which feature of some carbon dioxide extinguisher makes them dangerous for use on class C fires

Metal horn

What residue does a CO2 fire extinguisher leave when discharged; A)Carbon B)Iron oxide C)Mineral salt D)None

None

What is the term for a water-soluble flammable liquid

Polar solvent

What is one disadvantage of CO2 extinguishers

Short discharge range

What is the best way to extinguish a Class C fire

Shut off the power and treat it as a Class A or B fire

What is a correct use for a portable fire extinguisher

Situations in which the use of water is no recommended

What does a rating of 40 on a Class B extinguisher mean

Sufficient extinguishing power for 40 square feet of burning fuel

Which statement is correct regarding Class D extinguishing agents

The specific agent must be matched to the specific fuel

Which statement about the numerical rating of a Class K

There is no numerical rating for a Class K extinguisher

For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification

They are not necessarily related

What does it mean when a fire extinguisher has a pictograph with a red slash through it

Use on that class of fire could be hazardous

What is the most commonly used extinguishing agent for Class A fires

Water

Which agent is approved for use in a Class K system

Wet Chemical

For the purpose of extinguisher selection and placement, what is an example of a light hazard environment

classroom

A fire extinguisher's agent is stored within its

cylinder

Which statement about dry chemical agents is correct

dry chemical agents are not subject to freezing

A potential problem with application of a multipurpose dry chemical agent to a Class K fire is

neutralization of other agents applied to the fire

A Class C agent must

not conduct electricity

According of NFPA 10, the maximum floor area that can be protected by each extinguisher depends on the

occupancy type

The weight of carbon dioxide is about __ the weight of air

one-and-a-half times

Which of the following is one of the three basic components required for fire

oxygen

All portable fire extinguishers use which means for expelling their contents

pressure

For an extinguishing agent to be rated for a particular class of fire, it must

prevent rekindling

The "P" in the acronym PASS, used in reference to fire extinguisher operation, stands for

pull

A loaded stream extinguisher is designed to

resist freezing

A Class K agent's effect on the fuel is known as

saponification

All fire extinguishers are classified according to

the classes of fire on which they are effective

Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher

twisting motion

The traditional symbol for a Class D fire extinguisher is a(n)

yellow star

Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged

After any discharge

Which agent is rated for use on Class A fires

Ammonium phosphate

What is a primary factor when determining hazard classification for extinguisher selection and placement

Amount of combustibles present

For the purpose of extinguisher selection and placement, light hazard environments usually contain amount of combustibles of which class

B

Which class of fire includes flammable and combustible liquids

B

Which class of fire is depicted in the pictograph system by a flame and gasoline can

B

Which of the following is commonly used as a dry chemical extinguishing agent

ammonium phosphate

For an area to qualify for the classification of "light hazard", most of the combustible present must be

arranged so that a fire is unlikely to spread

For an extinguishing agent to be approved for use on energized electrical equipment, it must

be electrically nonconductive

To qualify as a light hazard for the purpose of extinguisher election and placement, the majority of materials in the area must

be noncombustible

Dry chemical extinguishers may be used on Class C fires because they

do not conduct electricity

A Class C extinguisher is rated for use on

energized electrical equipment

When approaching a fire with an extinguisher in hand, you should always have a(n)

exit route

For the purpose of extinguisher selection and placement, a woodworking shop is a(n) ___ hazard environment

extra

Which hazard category includes automotive service or repair facilities

extra

Class D agents work primarily by

forming a crust over the fuel

Bromochlorodifluoromethane is a ___ agent

halogenated

The use of Halon 1211 is strictly controlled because it is

harmful to the environment

Combustion begins when a fuel is heated to its

ignition point

What expels the extinguishing agent from a pump tank water extinguisher

manual effort