Firefighter 1 Part 25
What class of fire involves combustible cooking media, such as oils and grease?
Class K
Regular dry chemicals (sodium bicarbonate-based and potassium based) work on --------- fires.
Classes B and C
Class K fires involve:
Combustible cooking oils
The Aqueous Film Forming Foam (AFFF) portable fire extinguishers use what means for expelling their contents?
Compressed air
Which is true regarding fire extinguishers? -Firefighters should only rely on fire extinguishers carried on fire apparatus - Firefighters should only rely on fire extinguishers found in occupancies -NFPA 1901 requires one fire extinguisher - NFPA 1901 requires a pressurized water fire extinguisher
Firefighters should only rely on fire extinguishers carried on fire apparatus
Which is an advantage of power inverters?
Fuel efficiency
What extinguishing agents are being replaced because they have been banned for destroying the Earths ozone layer?
Halons or halogenated hydrocarbons
How should an extinguisher with a fixed nozzle be carried when approaching a fire?
In the favored hand
Which statement is correct regarding fire extinguishers and combustible metals?
No single agent will control or extinguish fires in all combustible metals
What residue does a CO2 fire extinguisher leave when discharged?
None
Class K fires involve:
Oils and greases found in commercial kitchens
The acronym for the four step process for proper use of fire extinguishers is:
PASS
What is the term for water-soluble flammable liquids such as alcohols, acetone, and others?
Polar solvents
Statement 1: Slow oxidation, such as rust, generates enough heat to become self-sustained. Statement 2: Extinguishing agents deprive the combustion process of fuel, oxygen, or sufficient heat to sustain the reaction. Statement 3: Halon-replacement extinguishing agents interfere with the chemical chain reaction and terminates the combustion process
Statements 1 is false, statements 2 and 3 are true
Clean agents are:
gases that do not conduct electricity or leave a residue and are nonvolatile
A disadvantage of a mounted generator is that:
generator engines are noisy
Class K fires involve:
high temperature cooking oils, such as vegetable or animal oils and fats
There are two basic designs for handheld dry chemical extinguishers?
Cartridge and stored pressure
What factors should be considered when selecting a fire extinguisher?
The fuel
What is the relationship between dry powder and dry chemical extinguishing agents?
They are entirely different substances with entirely different applications.
Which is true regarding Aqueous Film Forming Foam (AFFF) fire extinguishers?
They are most effective on static pools of flammable liquids
What is the significance of the C in the fire extinguisher rating of 2-A:10-B:C
This extinguisher can be used on energized electrical equipment
What extinguisher may be required to extinguish a restaurant kitchen fire involving the fryers?
Type K
The organization charged with independently testing and certifying fire extinguishers is:
Underwriters Laboratories (UL)
Which is the best position to attack a fire with a portable extinguisher?
Upwind, with exit path behind you
Water type extinguishers exposed to weather below 40 degrees require ------- to be added.
ant-freeze
For an area to qualify as a light hazard, the majority of materials must meet one of tow requirements. One of those is that they must:
be noncombustible
Aqueous Film Forming Foam (AFFF) extinguishing agents are applicable to --------- fires.
both Class A and B
Halon-replacement extinguishing agents interfere with the:
chemical chain reaction and terminates the combustion process
One method fire extinguishers extinguish is by:
cooling
The use of halon agents is strictly controlled because it:
damages the ozone layer
Water-mist fire extinguishers are safe to use on energized electrical equipment because the water they use is:
deionized
Dry chemical extinguishers can be used on Class C fires because dry chemicals:
do not conduct electricity
Class C fires involve:
energized electrical equipment
Halogenated agents extinguish fire by:
interrupting chain reaction
Electrical cables used in conjunction with power plants and lighting equipment should be:
intrinsically safe
An advantage of portable generator os that it:
is small enough to be carried into the fire scene
Class C fires can be extinguished using:
multipurpose dry chemicals
Class K fires involve:
oils and greases found in commercials kitchens
The National Fire Protection Association (NFPA) requires portable fire extinguishers be inspected at least --------- to ensure that they are accessible and operable.
once a year
A loaded-stream fire extinguisher:
prevents freezing by adding an anti-freezing agent
The first step for using a fire extinguisher is to:
pull the pin
Fixed lights are usually mounted so they can be:
raised, lowered, and turned
A phenomenon that occurs when mixtures of alkaline-based chemicals and certain cooking oils come into contact resulting in the formation of a soapy film is called:
saponification
The greatest concern associated with selecting too small of an extinguisher is that:
the operator has to get closer to the fire
When applying dry powder to a Class D fire, the operator will need to:
use large amounts of dry powder to completely cover the burning material
The reason a fire extinguisher class icon would have a slash through it is because:
using the extinguisher on that class of fire would create additional risk
Pump tank extinguishers are used to apply:
water
When using a fire extinguisher, always approach the fire:
with an exit behind you