Chapter 7

Requirements for placing and mounting portable fire extinguishers are found in NFPA:

10

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

5

Which is a disadvantage of CO 2 extinguishers?

A disadvantage of carbon dioxide fire extinguishers is that it is not suitable for outdoor use, or in environments exposed to windy conditions.

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

Be noncombustible

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

By forming a crust over the fuel

Which extinguishing agent is suitable for use on a Class C fire?

Carbon dioxide

Which fire extinguishing agent is best for use on sensitive electronic equipment?

Carbon dioxide

Class B foam fire extinguishers are also effective on:

Class A fires.

Which is used to pressurize a stored-pressure water extinguisher?

Compressed air

Which class of fire includes combustible metals?

D

All fire extinguishers are classified according to:

D. the classes of fire on which they are effective

Which test is required to measure the ability of an extinguisher cylinder to withstand steady internal pressure?

Hydrostatic testing

Combustion begins when a fuel is heated to its:

Ignition point

What residue does a CO 2 fire extinguisher leave when discharged?

None

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

Sufficient extinguishing power for 40 square feet of burning fuel

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

Water

Which extinguishing agent is approved for use in a Class K system?

Wet Chemical

A Class C agent must:

not conduct electricity

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

A Class A fire extinguisher with a numerical rating of 2 contains _____ of water.

✓ 2.5

In general, the maximum discharge range of a CO 2 extinguisher is:

✓ 8ft(2.5m)

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

✓ Amount of combustible's present

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

✓ Arrange so that fire is unlikely to spread

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

✓ Classroom

What is the primary extinguishing mechanism of halogenated agents?

✓ Disrupting the molecular chain reaction

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

The production and use of Halon extinguishing agents is limited because they are:

✓ Harmful to the earths O-Zone layer

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

✓ Kitchen

What expels the extinguishing agent from a pump tank water extinguisher?

✓ Manual effort

Which is the most appropriate use for a portable fire extinguisher?

✓ Situations in which the use of water is not recommended

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 unsafe

Which statement about dry chemical agents is correct?

✓ a. 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:

✓ b. neutralization of other agents applied to the fire

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

✓ c. a wetting agent

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

✓ c. after any discharge

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

✓ c. each is rated for a different class of fire

Which statement is correct regarding Class D extinguishing agents?

✓ c. the specific agent must be matched to the specific fuel

Which statement about the numerical rating of a Class K extinguisher is correct?

✓ c. there is no numerical rating for a class K extinguisher

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

✓ c. twisting motion

A Class B foam extinguisher is effective on all of the following fuels except one. Choose the exception.

✓ cooking oil

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

✓ d. cutting off the oxygen supply

What is the term for a water-soluble flammable liquid?

✓ d. polar solvent

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

✓ do not conduct electricity

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

According to NFPA standards, the maximum floor area that can be protected by each extinguisher is specified according to:

✓ occupancy type

The weight of carbon dioxide is about ___________ times the weight of air.

✓ one-and-a-half times

All portable fire extinguishers use which means for expelling their contents?

✓ pressure

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

✓ yellow star

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

B

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 agent is rated for use on Class A fires?

ammonium phosphate

For the purpose of extinguisher selection and placement, light hazard environments may contain a limited amount of combustibles of which class?

b

Which class of fire includes flammable and combustible liquids?

b

Which class of fire involves energized electrical equipment?

c

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

c

A Class C extinguisher is rated for use on:

energized electrical equipment

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

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

heat, 02, fuel

Which class of fire includes combustible cooking oils and fats?

k

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

k