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