Fire Extinguisher
Requirements for placing and mounting portable fire extinguishers are found in NFPA ____.
10
Class A fire extinguisher with a numerical rating of 2 contains ___ gallons of water.
2.5
The hydrostatic test interval for a dry chemical extinguisher with a stainless steel shell in every ___ years.
5
In general, the maximum reach of a Co2 extinguisher is ___ feet.
8
What compound is added to a water extinguisher to improve penetration of fuel?
A wetting agent
To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must ________.
Be noncombustible
The traditional symbol for a class C fire extinguisher is a(n) ___.
Blue circle
Aqueous Film Forming Foam (AFFF) Extinguishing agents are applicable to ___ fires.
Both Class A and B
How do multipurpose dry chemical agents prevent rekindling of Class A fuel?
By forming a crust over the fuel
What extinguishing agents is suitable for use on a Class C Fire?
Carbon dioxide
What fire extinguishing agent is best for use on sensitive electronic equipment ?
Carbon dioxide
There are two basic designs for hand held dry chemical extinguishers:
Cartridge and stored pressure
A green triangle containing a letter would indicate an extinguisher to be used on ____ fires.
Class A
What class of fire extinguisher includes a number in its classification?
Class A
What class of fire includes cloth?
Class A
What class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?
Class A
For the purpose of extinguisher selection and placement, light hazard environments usually contain a limited amount of combustibles of which class?
Class B
What class of fire includes flammable and combustible liquids?
Class B
What class of fire is depicted in the pictograph system by a flame and gasoline can?
Class B
Halon fire extinguishers are primarily designed for use on ____ fires
Class B and C
Regular dry chemicals (sodium bicarbonate-based and potassium-based) work on __________ fires.
Class B and C
What statement about foam fire extinguishers is correct?
Class B foam extinguishers may be used to some effect on class A fires
What class of fire involves energized electrical equipment?
Class C
What class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?
Class C
Fire involving combustible metals such as magnesium, titanium, zirconium, sodium and potassium, are ____ fires.
Class D
What class of fire involves combustible metals?
Class D
What class of fire involves combustible cooking oils and fats?
Class K
What class of fire is depicted in the pictograph system by a fire in a frying pan?
Class K
What advantage does a Co2 have over a dry chemical extinguisher?
Co2 does not leave a residue or corrode electical contacts
The Aqueous Film Forming Foam (AFFF) portable fire extinguishers use what means for expelling their contents?
Compressed air
A Class B foam extinguisher is not rated for ___.
Cooking oil
What extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?
Cutting off the oxygen supply
A fire extinguisher's agent is stored within its ___.
Cylinder
The use of halon agents is strictly controlled because it:
Damages the ozone layers
What is the preferred method of applying dry chemical agents to flammable liquid spill fires to:
Direct the stream at the base of the fire using a sweeping motion
What type of portable fire extinguishers is least likely to expose the operator to electrical shock?
Dry chemical
What statement is correct about dry chemical agents?
Dry chemical agents are not subject to freezing
What is the difference between dry powder and dry chemical extinguishing agents?
Each is rated for a different class of fire
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
What is the term for the substance that puts out the fire?
Extinguishing agent
For the purpose of extinguisher selection and placement, a woodworking shop is a(n) ___ hazard environment.
Extra
What hazard category includes automative service or repair facilities?
Extra
What is an advantage of portable fire extinguishers over hose lines?
Faster deployment
A portable fire extinguisher is best suited for which situation?
Fire in a wastebasket
Class D agents work primarily by ____.
Forming a crust over the fuel
The skill of operating a fire extinguisher is fairly easy in ___ basic steps?
Four
The traditional symbol for a class A fire extinguisher is a(n) ____.
Green triangle
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
How should an extinguisher with a fixed nozzle be carried when approaching a fire?
In the favored hand
Halogenated agents extinguish fire by
Interrupting chain reaction
What is the primary extinguishing mechanism of dry chemical agents?
Interrupting the chemical chain reaction
What feature of some carbon dioxide extinguishers makes them makes them dangerous for use on class c fires ?
Metal horn
What residue does a Co2 fire extinguisher leave when discharged?
None
According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on the ____.
Occupancy type
Class K fire involve:
Oils and greases found in commercial kitchens
What is one of the three basic components required for Fire?
Oxygen
The acronym the four step process for proper use of fire extinguishers is:
PASS
What is the term for a water soluble flammable liquid?
Polar solvent
The "P" in the acronym PASS, used in reference to fire extinguisher operation, stands for ____.
Pull
The traditional symbol for a class B fire extinguisher is a(n) ___.
Red square
A loaded stream extinguisher is designed to ______.
Resist freezing
A class K agent's effect on the fuel is known as _______.
Saponification
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 not recommended
A carbon dioxide (co2) extinguisher's means of discharge is:
Stored liquefied compressed gas
What does a rating of 40 on a Class B extinguisher mean?
Sufficient extinguishing power for 40 square feet of burning fuel
What does a rating of 40 on a class B extinguisher mean?
Sufficient extinguishing power for 40 square feet of burning fuel
All fire extinguishers are classified according to ______.
The classes of fire on which they are effective
The greatest concern associated with selecting too small of an extinguisher is that:
The operator has to get closer to the fire
What about class D extinguishing agents is correct?
The specific agent must be matched to the specific fuel
What statement about the numerical rating of a class k extinguisher is correct?
There is no numerical rating for a class k extinguisher
What about fire extinguishers and combustible metals is correct?
There no single agent will control or extinguish fires in all combustible metals.
For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?
They are not necessarily related
Fire fighters should only rely on fire extinguishers carried on fire apparatus.
True
What motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?
Twisting motion
What is the best position to attack a fire with a portable extinguisher?
Upwind, with exit path behind you
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 agents for class A fires?
Water
What agent is approved for use in a class K system?
Wet chemical
The traditional symbol for a class D fire extinguisher is a(n) ___.
Yellow star
The traditional symbol for a class D fire extinguishers is a(n) ____.
Yellow star
Extinguishing agents safe for use on fires in or near energized electrical equipment include:
carbon dioxide and dry chemical
For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?
classroom
What is used to pressurize a stored-pressure water extinguisher?
compressed air
Dry chemical extinguishers may be used on class C fires because they ___.
do not conduct electricity
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
The weight of carbon dioxide is about ___ the weight of air.
one and a half times
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
Pump tank extinguishers are used to apply:
water
When a dry chemical extinguisher should be serviced and charged?
After any discharge
When approaching a fire stored- pressure water extinguishers are designed to be discharged with the nozzles:
Aimed at the bases of the fire
What is a substance commonly used as a dry chemical extinguishing agent?
Ammonium phosphate
What is the agent 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
Water type extinguishers exposed to weather below 40 degrees require ___ to be added.
Anti- freeze
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
Bromochlorodifluoromethane is a _________ agent.
halogenated
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