Portable Fire Extinguishers

Class D agents work primarily by: Select one: a. penetrating the fuel. b. forming a crust over the fuel. c. suppressing vapor production. d. inhibiting the chemical chain reaction.

b. forming a crust over the fuel

The production and use of Halon extinguishing agents is limited because they are: Select one: a. mutagenic. b. harmful to the earth's ozone layer. c. a chemical asphyxiant. d. carcinogenic.

b. harmful to the earth's ozone layer

Requirements for placing and mounting portable fire extinguishers are found in NFPA: Select one: a. 10. b. 170. c. 470. d. 1201.

a. 10

Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire? Select one: a. A b. B c. D d. K

a. A

Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged? Select one: a. After any discharge b. After a discharge resulting in loss of 10 percent of pressurization c. After a discharge resulting in loss of 20 percent of pressurization d. After a discharge resulting in loss of 30 percent of pressurization

a. After any discharge

Which is used to pressurize a stored-pressure water extinguisher? Select one: a. Air b. Argon c. Water d. Carbon dioxide

a. Air

How do multipurpose dry chemical agents prevent rekindling of Class A fuel? Select one: a. By forming a crust over the fuel b. By penetrating the fuel c. By attracting and holding moisture d. By interrupting the chemical chain reaction

a. By forming a crust over the fuel

Class B foam fire extinguishers are also effective on: Select one: a. Class A fires. b. Class C fires. c. cooking oil. d. None of these is correct.

a. Class A fires

Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid? Select one: a. Cutting off the oxygen supply b. Inhibiting the chemical chain reaction c. Diluting the fuel d. Cooling the fuel

a. Cutting off the oxygen supply

Which class of fire includes combustible cooking oils and fats? Select one: a. K b. A c. B d. D

a. K

Which class of fire is depicted in the pictograph system by a fire in a frying pan? Select one: a. K b. B c. C d. D

a. K

What expels the extinguishing agent from a pump tank water extinguisher? Select one: a. Manual effort b. Pressure cartridge c. Compressed air d. Gravity

a. Manual effort

Which statement about the numerical rating of a Class K extinguisher is correct? Select one: a. There is no numerical rating for a Class K extinguisher. b. The numerical rating indicates the relative extinguishing power of the agent. c. The numerical rating indicates the relative duration of the agent. d. A numerical rating is required for commercial hood systems.

a. 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? Select one: a. They are not necessarily related b. Occupancy determines hazard c. Hazard determines occupancy d. They are different terms for the same thing

a. They are not necessarily related

Which extinguishing agent is approved for use in a Class K system? Select one: a. Wet chemical b. Aqueous film-forming foam c. Carbon dioxide d. Dry chemical

a. Wet chemical

A potential problem with application of a multipurpose dry chemical agent to a Class K fire is: Select one: a. counteraction of other agents applied to the fire. b. production of toxic gas. c. spitting and splattering of fuel. d. sudden flare-up of the fire.

a. counteraction of other agents applied to the fire

When approaching a fire with an extinguisher in hand, you should always have a(n): Select one: a. exit route. b. backup unit. c. light source. d. portable radio.

a. exit route

Bromochlorodifluoromethane is a _________ agent. Select one: a. halon b. wet chemical c. Class D d. multipurpose dry chemical

a. halon

For an extinguishing agent to be approved for use on energized electrical equipment, it must: Select one: a. not conduct electricity. b. leave no residue. c. be non-corrosive. d. be safe for use in a closed room.

a. not conduct electricity

For the purpose of extinguisher selection and placement, light hazard environments may contain a limited amount of combustibles of which class? Select one: a. K b. B c. C d. D

b. B

Which class of fire includes flammable and combustible liquids? Select one: a. A b. B c. C d. D

b. B

Which class of fire is depicted in the pictograph system by a flame and gasoline can? Select one: a. A b. B c. C d. D

b. B

Which fire extinguishing agent is best for use on sensitive electronic equipment? Select one: a. Loaded stream b. Carbon dioxide c. Aqueous film-forming foam (AFFF) d. Ammonium phosphate

b. Carbon dioxide

For the purpose of extinguisher selection and placement, what is an example of a light hazard environment? Select one: a. Self-storage building b. Classroom c. Parking garage d. Restaurant kitchen

b. Classroom

What is the term for the substance that puts out the fire? Select one: a. Propellant b. Extinguishing agent c. Dry charge d. Live load

b. Extinguishing agent

What is the term for a water-soluble flammable liquid? Select one: a. Hypergolic fuel b. Polar solvent c. Solute d. Miscible liquid

b. Polar solvent

What is the best way to extinguish a Class C fire? Select one: a. Withdraw to a safe distance and let the fire burn itself out b. Shut off the power and treat it as a Class A or B fire c. Use a Class C extinguisher d. Shut off the fuel flow at a valve

b. Shut off the power and treat it as a Class A or B fire

What does a rating of 40 on a Class B extinguisher mean? Select one: a. BTU absorption comparable to 40 gallons (150 L) of water b. Sufficient extinguishing power for 40 ft² (4.7 m²) of burning fuel c. Sufficient extinguishing power for 40 gallons (150 L) of burning fuel d. Discharge duration of at least 40 seconds

b. Sufficient extinguishing power for 40 ft² (4.7 m²) of burning fuel

Which statement is correct regarding Class D extinguishing agents? Select one: a. Application methods are similar regardless of the agent and fuel involved. b. The specific agent must be matched to the specific fuel. c. Most agents are effective on several Class D fuels. d. Some agents are also rated for other classes of fire.

b. The specific agent must be matched to the specific fuel

Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher? Select one: a. A strong pull directly outward b. Twisting motion c. Side-to-side motion d. Push, then pull

b. Twisting motion

What does it mean when a fire extinguisher has a pictograph with a red slash through it? Select one: a. Use on that class of fire would be ineffective b. Use on that class of fire could be unsafe c. The fire extinguisher has not been tested for use on that class of fire d. The fire extinguisher is rated for use on that class of fire

b. Use on that class of fire could be unsafe

For an area to qualify for the classification of "light hazard," most of the combustibles present must be: Select one: a. extinguishable by a portable fire extinguisher. b. arranged so that a fire is unlikely to spread. c. no more than moderately combustible. d. Class A only.

b. arranged so that a fire is unlikely to spread

Dry chemical extinguishers may be used on Class C fires because they: Select one: a. are chemically inert. b. do not conduct electricity. c. are noncorrosive. d. leave no residue.

b. do not conduct electricity

According to NFPA standards, the maximum floor area that can be protected by each extinguisher is specified according to: Select one: a. presence of built-in suppression systems. b. occupancy type. c. construction class. d. occupancy load.

b. occupancy type

A loaded stream extinguisher is designed to: Select one: a. prevent unnecessary water damage. b. resist freezing. c. improve fuel penetration. d. create a foam blanket.

b. resist freezing

A Class K agent's effect on the fuel is known as: Select one: a. emulsification. b. saponification. c. dissolution. d. hydrolyzation.

b. saponification

The weight of carbon dioxide is about _____ times the weight of air. Select one: a. 0.5 b. 1.0 c. 1.5 d. 2.0

c. 1.5

In general, the maximum discharge range of a CO2 extinguisher is: Select one: a. 33 ft (10 m). b. 16 ft (5 m). c. 8 ft (2.5 m). d. 5 ft (1.5 m).

c. 8 ft (2.5 m)

Which agent is rated for use on Class A fires? Select one: a. Potassium chloride b. Potassium bicarbonate c. Ammonium phosphate d. Sodium bicarbonate

c. Ammonium phosphate

Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket? Select one: a. K b. B c. C d. D

c. C

A Class B foam extinguisher is effective on all of the following fuels except one. Choose the exception. Select one: a. Gasoline b. Diesel fuel c. Cooking oil d. Paint thinner

c. Cooking oil

What is the primary extinguishing mechanism of halogenated agents? Select one: a. Suppressing vapor production b. Forming a crust over the fuel c. Disrupting the molecular chain reaction d. Displacing oxygen

c. Disrupting the molecular chain reaction

A portable fire extinguisher is bested suited for which situation? Select one: a. Car fire b. Room and contents fire c. Fire in a wastebasket d. Vegetation fire

c. Fire in a wastebasket

All portable fire extinguishers use which means for expelling their contents? Select one: a. Volume b. Vacuum c. Pressure d. Gravity

c. Pressure

Which is a disadvantage of CO2 extinguishers? Select one: a. Electrical conductivity b. Cost c. Short discharge range d. Corrosive residue

c. Short discharge range

All fire extinguishers are classified according to: Select one: a. the net weight of their contents. b. their relative extinguishing power. c. the classes of fire on which they are safe and effective. d. the type of extinguishing agent used.

c. the classes of fire on which they are safe and effective

A Class A fire extinguisher with a numerical rating of 2 contains _____ of water. Select one: a. 1.0 gal (3.8 L) b. 1.5 gal (5.7 L) c. 2.0 gal (7.6 L) d. 2.5 gal (9.5 L)

d. 2.5 gal (9.5 L)

Which compound is added to a water extinguisher to improve penetration of fuel? Select one: a. Alkali metal salt b. Alcohol c. Bicarbonate d. A wetting agent

d. A wetting agent

Which is a primary factor when determining hazard classification for extinguisher selection and placement? Select one: a. Permissible occupancy load b. Construction type c. Presence of a sprinkler system d. Amount of combustibles present

d. Amount of combustibles present

Which part of a fire extinguisher contains the extinguishing agent? Select one: a. Cartridge b. Horn c. Chamber d. Cylinder

d. Cylinder

Which class of fire includes combustible metals? Select one: a. K b. A c. B d. D

d. D

Which statement about dry chemical agents is correct? Select one: a. Dry chemical agents are noncorrosive. b. Dry chemical agents are compatible with all types of foam. c. All dry chemical agents have a multipurpose rating. d. Dry chemical agents are not subject to freezing.

d. Dry chemical agents are not subject to freezing

What is the difference between dry powder and dry chemical extinguishing agents? Select one: a. There is no difference. These are two different terms for the same thing. b. A dry powder is compatible with foam; a dry chemical is not. c. A dry powder is harmful to the environment; a dry chemical is not. d. Each is rated for a different class of fire.

d. Each is rated for a different class of fire

Which hazard category includes automotive service or repair facilities? Select one: a. Severe b. Moderate c. Ordinary d. Extra

d. Extra

Which test is required to measure the ability of an extinguisher cylinder to withstand steady internal pressure? Select one: a. Static b. Pneumatic c. Fatigue d. Hydrostatic

d. Hydrostatic

What residue does a CO2 fire extinguisher leave when discharged? Select one: a. Carbon b. Iron oxide c. Mineral salt d. None

d. None

Which is one of the three basic components required for fire? Select one: a. An ignition source b. A catalyst c. Carbon d. Oxygen

d. Oxygen

Which is a common dry chemical extinguishing agent? Select one: a. Calcium bicarbonate b. Carbon tetrachloride c. Potassium hydrate d. Potassium chloride

d. Potassium chloride

To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must: Select one: a. be fire resistive. b. be Class A or C combustibles. c. have a flash point exceeding 150°F. d. be low combustibility.

d. be low combustibility

For the purpose of extinguisher selection and placement, a woodworking shop is a(n) __________ hazard environment. Select one: a. light b. moderate c. ordinary d. extra

d. extra

Combustion begins when a fuel is heated to its: Select one: a. flash point. b. lower flammable limit. c. fire point. d. ignition temperature.

d. ignition temperature

A Class C agent must: Select one: a. be safe for use in an enclosed area. b. resist freezing. c. be compatible with foam. d. not conduct electricity.

d. not conduct electricity

For an extinguishing agent to be rated for a particular class of fire, it must: Select one: a. be effective in portable volumes. b. be noncorrosive. c. be nontoxic. d. prevent rekindling.

d. prevent rekindling

The "P" in the acronym PASS, used in reference to fire extinguisher operation, stands for: Select one: a. point. b. pick. c. pause. d. pull.

d. pull