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