Ch 8 Fire

Which class of fire is depicted in the pictograph system by a burning trashcan beside a wood fire? A) A B) D C) M D) R

A) A

Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid? A) Cutting off the oxygen B) Cooling the fuel below its kindling temperature C) Chemically converting the fuel to a non-fuel D) Reflecting evolved heat back into the fire

A) Cutting off the oxygen

Which traditional letter label is represented by a red square? A) A B) B C) C D) D

B) B

Why can dry chemical extinguishers be used on Class C fires? A) Because dry chemicals are chemically similar to water B) Because dry chemicals do not conduct electricity C) Because dry chemicals never actually touch the fuel D) Because dry chemicals are themselves electrically static

B) Because dry chemicals do not conduct electricity

Why would a fire extinguisher class icon have a red slash through it? A) Because using the extinguisher on that class of fire would be ineffective B) Because using the extinguisher on that class of fire would create additional risk C) Because the use of that type of extinguisher on that class has not been tested D) Because it is illegal to use that type of extinguisher on that class of fire for environmental reasons

B) Because using the extinguisher on that class of fire would create additional risk

How are fires and fire extinguishers grouped? A) Both are grouped into types. B) Both are grouped into classes. C) Fires are grouped into classes and extinguishers into types. D) Extinguishers are grouped into classes and fires into types.

B) Both are grouped into classes.

What is one extinguishing agent that will not conduct electricity? A) Carbon tetrachloride B) Carbon dioxide C) Aluminum powder D) Water with Class A foam added

B) Carbon dioxide

When operating a fire extinguisher, the acronym PASS can be used to assist you in the steps. What does the acronym stand for? A) Point, aim, shoot, stream B) Point, arms length, sweep, side C) Push, aim, side, side D) Pull, aim, squeeze, sweep

D) Pull, aim, squeeze, sweep

What can be added to water extinguishers to reduce the surface area of water to aid in extinguishment of fuels such as baled cotton or fibrous materials? A) Alkali metal salt B) Alcohol C) Quick water D) Wetting agent

D) Wetting agent

When approaching a fire with an extinguisher in hand, fire fighters should always have what behind them? A) An exit B) The wind C) A light source D) A backup extinguisher

A) An exit

Select the true statement regarding Class A and Class B foam fire extinguishers and their use on the unintended class of fire.

A) Class B extinguishers may be used to some effect on Class A fires.

What is the test used to measure the ability of a cylinder to withstand internal pressure? A) Hydrostatic testing B) Hydromatic testing C) Load testing D) Capacity testing

A) Hydrostatic testing

If a fire extinguisher containing ammonium phosphate is used on a Class K fire, not only will it be ineffective, but it can actually worsen the problem. How? A) It can counteract the foaming properties of any alkaline agent applied to the fire. B) It will emit hydrogen cyanide gas, a deadly and penetrating poison. C) It will cause a rapid polymerization, resulting in a near-BLEVE expansion of the fuel. D) It can cause the fuel to heat up internally to reacquire its flash point.

A) It can counteract the foaming properties of any alkaline agent applied to the fire.

Which class of fire involves combustible cooking oils and fats? A) K B) A C) B D) D Fundamentals of Fire Fighter Skills, Third Edition, page 201

A) K

Which of the following is NOT an example of a light hazard environment? A) Self-storage B) Classrooms C) Assembly halls D) Hotel guest rooms

A) Self-storage

How are occupancy use category and hazard classification related, if at all? A) They are not necessarily related. B) Occupancy determines hazard. C) Hazard determines occupancy. D) They are the same thing.

A) They are not necessarily related.

What, if anything, do the chemicals in multipurpose dry chemical extinguishers do to prevent rekindling of Class A materials? A) They form a crust over the fuel. B) They form a blanket of foam over the fuel. C) They chemically bond to the fuel making it noncombustible. D) They do nothing to prevent rekindling.

A) They form a crust over the fuel.

What is the most common extinguishing agent for Class A fires? A) Water B) CO2 C) Dry chemical D) Carbon tetrachloride

A) Water

Do fire apparatuses usually carry portable fire extinguishers? A) Yes, at least one and sometimes more. B) Yes, but only in non-hydranted areas. C) No, but they can and sometimes do. D) No, and they are prohibited from doing so.

A) Yes, at least one and sometimes more.

Which class of fire is depicted in the pictograph system by a flame and gasoline can? A) A B) B C) C D) D

B) B

Why is it dangerous to apply a stream of water to energized electrical equipment? A) Because burning electricity intensifies when struck by water B) Because water can conduct electricity back to the extinguisher C) Because electricity extracts the oxygen from the water and uses it as more fuel D) Because cyanide gas is evolved when water hits electricity

B) Because water can conduct electricity back to the extinguisher

Light hazard environments usually contain a limited amount of combustibles of which class? A) Class D B) Class A C) Class M D) Class B

B) Class A

What is the substance called that is contained in a portable fire extinguisher and puts out the fire? A) Propellant B) Extinguishing agent C) Dry charge D) Anhydrous material

B) Extinguishing agent

What residue, if any, does a CO2 fire extinguisher leave when discharged? A) Powdered carbon dioxide. B) It does not leave any residue. C) Selenium oxide. D) Simple salt.

B) It does not leave any residue.

What is the significance of the C in the following fire extinguisher rating? 2-A:10-B:C A) It means that the agent contained therein is of the cyanoacrylate-base family. B) It means that this extinguisher can be used on energized electrical equipment. C) The lack of a number following the C means it is not suitable for use on any electrical fire. D) It means that the agent contained therein is of the carbon-tetrachloride base family.

B) It means that this extinguisher can be used on energized electrical equipment.

The classification system for fire extinguishers uses which two types of symbols? A) Bar code and letters B) Letters and numbers C) Numbers and dots D) Dots and bar code

B) Letters and numbers

Which NFPA Standard lists the requirements for placing and mounting portable fire extinguishers? A) NFPA 5 B) NFPA 10 C) NFPA 15 D) NFPA 20

B) NFPA 10

What is the term for water-soluble flammable liquids such as alcohols, acetone, and others? A) Volatile fuels B) Polar solvents C) Flammable surfactants D) Three-dimensional liquids

B) Polar solvents

What is an advantage of portable fire extinguishers? A) Versatility B) Portability C) Amount of agent D) Stand-off distance from fire

B) Portability

For an area to qualify for the classification of light hazard, most of the combustibles present must meet one of two requirements. What is one of those? A) They must be extinguishable by a portable fire extinguisher. B) They must be arranged so that a fire is unlikely to spread. C) They must be composed of intrinsically safe elements. D) They must not react hypergolically to each other.

B) They must be arranged so that a fire is unlikely to spread.

What is the safest and surest way to extinguish a Class C fire? A) Drench it with copious amounts of water. B) Turn off the power and treat it as a Class A or Class B fire. C) Smother it with a treated carbon-fire blanket. D) Evacuate the air in the location of the fire.

B) Turn off the power and treat it as a Class A or Class B fire.

Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher? A) Slow, steady pull B) Twisting motion C) Side-to-side motion D) Push, then pull

B) Twisting motion

Does it matter which type of dry powder extinguisher is used on which type of burning metal? A) Yes, each type of metal is marked with which type of dry powder to use in case of fire. B) Yes, each dry powder-extinguishing agent is marked for use on specific combustible metal fires. C) No, one dry powder extinguisher will work on any kind of metal. D) No, one type of metal will respond to any type of dry powder.

B) Yes, each dry powder-extinguishing agent is marked for use on specific combustible metal fires.

According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on: A) the water supply. B) the occupancy type. C) the skill of the user. D) the building's history of fire.

B) the occupancy type.

What is the weight of carbon dioxide in comparison to air? A) 0.5 B) 1 C) 1.5 D) 2

C) 1.5

A Class B extinguisher with a rating of 40-B would be expected to extinguish which size flammable liquid surface fire? A) 40 cubic feet B) 40 cubic meters C) 40 square feet D) 40 square inches

C) 40 square feet

What is generally the maximum distance a CO2 extinguisher can be expected to reach? A) 32 feet B) 16 feet C) 8 feet D) 4 feet

C) 8 feet

Which class of fire involves ordinary combustibles, such as wood, paper, cloth, rubber, and some plastics? A) C B) B C) A D) 1

C) A

Which class of fire involves flammable or combustible liquids? A) K B) A C) B D) D

C) B

Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket? A) K B) B C) C D) D

C) C

Besides putting out incipient fires, what is another use for portable fire extinguishers? A) Wetting exposures to keep them from igniting from radiated heat B) Controlling large flammable liquids fires that are not yet dammed or diked C) Controlling fires where traditional methods of suppression are not recommended D) Serving as an alternate forcible entry device through standard wooden residential doors

C) Controlling fires where traditional methods of suppression are not recommended

Class B foam extinguishers are not suitable for which particular type of flammable liquid fire? A) Gasoline B) Diesel fuel C) Cooking oil D) Jet A or B fuels

C) Cooking oil

Fire fighters use portable fire extinguishers to put out small fires that do not require the use of what? A) The fire department B) Protective clothing C) Hose lines D) A run report

C) Hose lines

Which hazard category is represented by the following: auto showrooms, parking garages, and retail stores? A) Severe B) Light C) Ordinary D) Extra

C) Ordinary

All portable fire extinguishers use what means for expelling their contents? A) Springs B) Vacuum C) Pressure D) Gravity

C) Pressure

What is one disadvantage of CO2 extinguishers compared to other extinguishers? A) Electrical conductivity B) Expensive chemical inside C) Short discharge range D) Messy residue

C) Short discharge range

What is one disadvantage of CO2 extinguishers? A) Electrical conductivity B) Expensive chemical inside C) Short discharge range D) Messy residue

C) Short discharge range

The dry chemicals in fire extinguishers work in two ways. What is one of those ways? A) They form an oxygen barrier between the air and the fuel. B) They chemically convert the fuel to a non-fuel isotope. C) They interrupt the chemical chain reactions of combustion. D) They imitate the oxygen molecules a fire needs to burn.

C) They interrupt the chemical chain reactions of combustion.

Portable fire extinguishers have two primary uses. What is one? A) To defuse possible backdraft conditions B) To reach rollover gases C) To extinguish incipient fires D) To provide emergency air

C) To extinguish incipient fires

Is it ever appropriate to have two different types of fire extinguisher in the same area? A) No, this sets up the possibility of opposing streams. B) No, this risks laypeople selecting the wrong one. C) Yes, there may be more than one type of combustible. D) No, this is prohibited by the building code.

C) Yes, there may be more than one type of combustible.

Fire prevention programs encourage citizens to keep fire extinguishers in their homes, especially in the: A) garage. B) bedrooms. C) kitchen. D) areas near the exits.

C) kitchen.

How many gallons of water are contained in a Class A fire extinguisher with a numerical rating of 2? A) 1 B) 1.5 C) 2 D) 2.5

D) 2.5

What is the range of a 2.5-gallon water extinguisher expelled in a solid stream? A) 5-10 feet B) 15-20 feet C) 25-30 feet D) 35-40 feet

D) 35-40 feet

Which classes of fire extinguisher include a number in their classification? A) B and C B) C and M C) M and A D) A and B

D) A and B

When should fire extinguishers on apparatus be inspected? A) Monthly B) Annually C) When there is evidence the extinguisher has been used D) Along with regular apparatus equipment checks

D) Along with regular apparatus equipment checks

What is one chemical used as a dry chemical extinguishing agent? A) Ammonium nitrate B) Trinitrotoluene C) Methyl isocyanate D) Ammonium phosphate

D) Ammonium phosphate

When determining what risk classification to assign a certain building area, which two factors contribute? A) Direction and density of pedestrian traffic flow B) Elevation and configuration of the given area C) Volume and pressure capacity of sprinklers D) Amount and type of combustibles present

D) Amount and type of combustibles present

Which class of fire would involve energized building wiring, fuse boxes, transformers, or generators? A) F B) E C) D D) C

D) C

Which class of fire involves combustible metals? A) K B) A C) B D) D

D) D

Which hazard category is represented by the following: woodworking shops, service or repair facilities for cars, and cooking areas with deep fryers? A) Severe B) Consumer C) Regular D) Extra

D) Extra

Bromochlorodifluoromethane should be recognized by fire fighters as a certain type of extinguishing agent. Which agent? A) Carbon tet B) MetalX C) CO2 D) Halon 1211

D) Halon 1211

All fires require three basic ingredients, one of which is fuel. What is another? A) Nitrogen B) Surfactant C) Water D) Heat

D) Heat

What is another word for when a material begins to burn? A) Flash point B) Evolution temperature C) Liquefaction temperature D) Ignition point

D) Ignition point

Why is the use of halon agents strictly controlled? A) It is mutagenic. B) It is carcinogenic. C) It pollutes ground water. D) It damages the ozone layer.

D) It damages the ozone layer.

What one characteristic makes an extinguishing agent suitable for fighting Class C fires? A) It must absorb more heat that water does. B) It must absorb only minimal heat. C) It must not catalyze a polymer reaction. D) It must not conduct electricity.

D) It must not conduct electricity.

Which statement accurately describes how relatively easy or hard it would be for a trained person to extinguish a fire in a wastebasket, with a suitable portable fire extinguisher? A) It would be hard with success unlikely. B) It would be touch and go; the outcome would be unpredictable. C) It would be tough, but would likely succeed. D) It would be easy.

D) It would be easy.

Which class of fire is depicted in the pictograph system by a fire in a frying pan? A) A B) B C) C D) K

D) K

Which of the following statements is accurate regarding fire extinguishers? A) Maintenance is required if the pressure exceeds 3000 psi. B) Servicing is not required if it was discharged for less than 5 seconds. C) 2.5-gallon, stored-pressure extinguishers cannot be recharged by fire fighters. D) Non-rechargeable extinguishers must be replaced after any use.

D) Non-rechargeable extinguishers must be replaced after any use.

What is the body of a portable fire extinguisher called? A) The bell B) The horn C) The agent D) The cylinder

D) The cylinder

How is the numerical rating of Class K portable fire extinguishers assigned, if there is such a rating? A) On the basis of square feet of burning fuel extinguished by an expert. B) On the basis of square feet of burning fuel extinguished by a layperson. C) On the basis of a mathematical formula and the net weight of agent. D) There is no such rating assigned.

D) There is no such rating assigned.

What is the relationship, if any, between dry powder and dry chemical extinguishing agents? A) They are two different names for the same substance with the same application. B) Dry chemical is one of the many types of dry powder. C) Dry powder is one of the many types of dry chemical. D) They are entirely different substances with entirely different applications.

D) They are entirely different substances with entirely different applications.

At which temperature, if at all, are dry chemicals subject to freezing? A) At the same temperature as fresh water. B) At the same temperature as salt water. C) At the same temperature as n-heptane. D) They are not subject to freezing.

D) They are not subject to freezing.

What is one advantage of portable fire extinguishers over hose lines? A) They pack more suppression punch. B) They have controllable rates of flow. C) They don't run out as quickly. D) They are quicker to deploy and use.

D) They are quicker to deploy and use.

What happens if normal extinguishing agents are tried on Class D fires? A) Typically, nothing happens at all. B) They put out the fire, but produce poisonous gases. C) They work, but only when delivered at great pressure. D) They may react violently, even explosively.

D) They may react violently, even explosively.

For an area to qualify as a light hazard, the majority of materials must meet one of two requirements. What is one of those? A) They must be necessary for the work of the area. B) They must be UL listed. C) They must have ignition temperatures in excess of 451ºF. D) They must be noncombustible.

D) They must be noncombustible.

Fire extinguishers are rated for their ability to control a specific type of fire and:

D) ability to prevent rekindling.