Chapter 6

Question 1

How are portable fire extinguishers classified? (254) [4.3.16]

A. By their size and weight
B. By where they were manufactured
C. According to the amount of time they have been in service
D. According to the type of fire they are designed to extinguish

Answer 1

D. According to the type of fire they are designed to extinguish

Question 2

How are the different classes of portable fire extinguishers distinguished from one another? (254) [4.3.16]

A. Color-coded paint
B. Numerical barcode labels
C. Letter and/or symbol labels
D. Extinguishing agent capacity

Answer 2

C. Letter and/or symbol labels

Question 3

What is an example of a Class A combustible material? (255) [4.3.16]

A. Paper
B. Gasoline
C. Magnesium
D. Vegetable oil

Answer 3

A. Paper

Question 4

A fire involving _______ would be considered a Class A fire. (255) [4.3.16]

A. Halon
B. Rubber
C. Cooking oil
D. Computer equipment

Answer 4

A. Halon

Question 5

Which extinguishing agent is used to extinguish a Class A fire? (255) [4.3.16]

A. Halon
B. Water
C. Dry powder
D. Wet chemical

Answer 5

B. Water

Question 6

Class B fires involve: (256) [4.3.16]

A. Energized electrical equipment.
B. Flammable or combustible metals.
C. Flammable or combustible liquids and gases.
D. Ordinary combustibles such as wood and paper.

Answer 6

C. Flammable or combustible liquids and gases.

Question 7

_______ is a Class B fuel. (256) [4.3.16]

A. Rubber
B. Alcohol
C. Sodium
D. Lithium

Answer 7

C. Sodium

Question 8

What would be classified as a Class B fire? (256) [4.3.16]

A. Tire fire
B. Wildland fire
C. Fuel storage tank fire
D. Commercial kitchen fire

Answer 8

C. Fuel storage tank fire

Question 9

If a small diesel fuel spill catches on fire, the most effective extinguishing agent would be: (256) [4.3.16]

A. Dry powder.
B. Class A foam.
C. Colonized water.
D. Carbon dioxide (CO₂).

Answer 9

D. Carbon dioxide (CO₂).

Question 10

What is an example of a Class C fire? (256) [4.3.16]

A. Kitchen fire
B. Electrical fire
C. Fire involving yard waste
D. Fire involving magnesium

Answer 10

B. Electrical fire

Question 11

What would be the safest action for an incipient fire in a circuit breaker box if the electricity cannot be turned off? (256) [4.3.16]

A. Use a Class C extinguisher.
B. Use a stored-pressure water extinguisher.
C. Treat it the same as a Class A or Class B fire.
D. Combine dry powder and Class A foam to fight it.

Answer 11

A. Use a Class C extinguisher.

Question 12

What is an example of a Class D fuel? (256) [4.3.16]

A. Rubber
B. Alcohol
C. Titanium
D. Petroleum

Answer 12

C. Titanium

Question 13

Which type of extinguisher is designed for a fire involving magnesium? (257) [4.3.16]

A. Dry powder
B. Class A foam
C. Wet chemical
D. Dry chemical

Answer 13

A. Dry powder

Question 14

What statement about Class D extinguisher ratings is accurate? (257) [4.3.16]

A. Class D extinguishers are labeled with a rating showing which other classes of fire they are able to extinguish.

B. Class D extinguishers are labeled with a numerical rating that tells how much area the extinguisher is rated to cover.

C. Instead of a numerical rating, Class D extinguishers include application instructions on the faceplate of the extinguisher.

D. Class D extinguishers are not labeled with a rating for other classes of fire because they are automatically assumed safe to use on all classes.

Answer 14

C. Instead of a numerical rating, Class D extinguishers include application instructions on the faceplate of the extinguisher.

Question 15

A grease fire involving a deep fryer would be classified as: (258) [4.3.16]

A. Class A.
B. Class B.
C. Class D.
D. Class K.

Answer 15

D. Class K.

Question 16

Class K fires are extinguished using portable fire extinguishers or _______ systems. (258) [4.3.16]

A. Dry powder
B. Dry chemical
C. Wet chemical
D. Pressurized water

Answer 16

C. Wet chemical

Question 17

Class K extinguishers convert fatty acids in oils into a soapy film, which is known as the process of: (259) [4.3.16]

A. Smothering.
B. Pressurization.
C. Saponification.
D. Chain breaking.

Answer 17

C. Saponification.

Question 18

Portable extinguishers that use the smothering method to extinguish fire work by: (258) [4.3.16]

A. Creating a soapy foam surface.
B. Excluding oxygen from the burning process.
C. Reducing the temperature of whatever is burning.
D. Stopping the chemical chain reaction from occurring.

Answer 18

B. Excluding oxygen from the burning process.

Question 19

When the cartridge seal is broken on a fire extinguisher with a pressure cartridge, the: (260) [4.3.16]

A. Cartridge will fill up with the extinguishing agent.
B. Extinguisher will no longer be able to function properly.
C. Extinguishing agent will be mixed in the proper concentration.
D. Expellant will enter the container and force the agent out the nozzle.

Answer 19

D. Expellant will enter the container and force the agent out the nozzle.

Question 20

The appropriate extinguisher to use for a small ground cover fire would be a: (260) [4.3.16]

A. Clean agent extinguisher.
B. Class A foam extinguisher.
C. Pump-type water extinguisher.
D. Wet chemical stored-pressure extinguisher.

Answer 20

C. Pump-type water extinguisher.

Question 21

What is designed to fight Class A fires but is also safe for use on energized electrical equipment? (261) [4.3.16]

A. Air-aspirating foam extinguisher.
B. Water-mist stored-pressure extinguisher.
C. Aqueous film forming foam extinguisher.
D. Wet chemical stored-pressure extinguisher.

Answer 21

B. Water-mist stored-pressure extinguisher.

Question 22

Which type of extinguisher contains a special agent formulated to saponify the oils in a Class K fire? (261) [4.3.16]

A. Clean agent extinguisher.
B. Halogenated agent extinguisher.
C. Aqueous film forming foam extinguisher.
D. Wet chemical stored-pressure extinguisher.

Answer 22

D. Wet chemical stored-pressure extinguisher.

Question 23

An aqueous film forming foam (AFFF) extinguisher would be appropriate to use on a: (261) [4.3.16]

A. Small fuel spill.
B. Common structure fire.
C. Vehicle fire involving Class D metals.
D. Fire at a large-scale hazardous materials incident.

Answer 23

A. Small fuel spill.

Question 24

What distinguishes an aqueous film forming foam (AFFF) extinguisher from a stored-pressure water extinguisher? (262) [4.3.16]

A. Air-aspirating foam nozzle that aerates the foam solution.
B. Adjustable nozzle that can be set to a wide or narrow spray pattern.
C. Pressurized expellant container attached to the outside of the extinguisher.
D. Water and foam solution stored in separate containers within the extinguisher.

Answer 24

A. Air-aspirating foam nozzle that aerates the foam solution.

Question 25

Clean agent extinguishers: (262) [4.3.16] A. Are effective in fighting Class A, Class B, and Class D fires. B. Are nonconductive and can extinguish energized electrical equipment fires. C. Should be replaced by Halon extinguishers, which are safer for the environment. D. Will cause damage if used to extinguish fires involving computers or electronic equipment.

Answer 25

B. Are nonconductive and can extinguish energized electrical equipment fires.

Question 26

A carbon dioxide (CO₂) extinguisher would be an appropriate choice to extinguish a _______ fire. (262) [4.3.16] A. Class A B. Class B C. Class D D. Class K

Answer 26

B. Class B

Question 27

Carbon dioxide (CO₂) extinguishers work by: (262) [4.3.16] A. Cooling the burning materials. B. Creating a soapy film to smother the fire. C. Displacing oxygen and smothering the fire. D. Interrupting the chemical chain reaction in the burning process.

Answer 27

C. Displacing oxygen and smothering the fire.

Question 28

When using dry chemical extinguishers, firefighters should be aware that: (263) [4.3.16] A. Discharging the agent on a Class C fire is not recommended. B. Touching the cone of the extinguisher may result in severe burns. C. Application of the agent may result in a cloud of airborne particulates. D. The agents used within are toxic to humans and harmful to the environment.

Answer 28

C. Application of the agent may result in a cloud of airborne particulates.

Question 29

What are the two basic designs for handheld dry chemical extinguishers? (264) [4.3.16] A. Fog and straight stream. B. Low pressure and high pressure. C. Cartridge-operated and stored-pressure. D. Compressed air and compressed nitrogen.

Answer 29

C. Cartridge-operated and stored-pressure.

Question 30

When using a wheeled dry chemical extinguisher unit, the operator should: (264) [4.3.16] A. Pressurize the tank after opening the nozzle. B. Stretch out the hose completely before discharging the agent. C. Attach the air line only after the wheels have been locked in place. D. Use hand tools to spread the agent instead of dumping the contents directly onto the fire.

Answer 30

B. Stretch out the hose completely before discharging the agent. ✨Just think about the life you're creating for yourself! Wow!✨

Question 31

What type of fire requires a dry powder extinguisher? (264) [4.3.16] A. Class A B. Class B C. Class C D. Class D

Answer 31

D. Class D

Question 32

What is the best plan of action if the goal is to protect highly sensitive computer equipment? (266) [4.3.16] A. Select a clean agent or carbon dioxide extinguisher. B. Shut off the electricity and use a stored-pressure water extinguisher. C. Use the minimum amount of foam to fight the fire. D. Choose the appropriate Class D extinguisher designed for the burning material.

Answer 32

D. Choose the appropriate Class D extinguisher designed for the burning material.

Question 33

What is the best plan of action if the goal is to protect highly sensitive computer equipment? (266) [4.3.16] A. Select a clean agent or carbon dioxide extinguisher. B. Shut off the electricity and use a stored-pressure water extinguisher. C. Use the minimum amount of foam to fight the fire. D. Choose the appropriate Class D extinguisher designed for the burning material.

Answer 33

A. Select a clean agent or carbon dioxide extinguisher.

Question 34

Before using a fire extinguisher, check the weight of the extinguisher; this should tell you: (267) [4.3.16] A. If the extinguisher contains agent. B. The last time the extinguisher was serviced. C. The condition of the interior of the extinguisher. D. Whether the nozzle is at an operable range.

Answer 34

A. If the extinguisher contains agent.

Question 35

What is the final step in the PASS application method? (267) [4.3.16] A. Squeeze the handles. B. Secure the pin or plastic seal. C. Stand the extinguisher upright. D. Sweep the nozzle back and forth.

Answer 35

D. Sweep the nozzle back and forth.

Question 36

What is a consideration for using extinguishers for suppressing incipient fires of all classes? (268) [4.3.16] A. Use of any extinguisher requires the presence of a charged hoseline as backup. B. Empty fire extinguishers should be set upright to signal that they no longer can be used. C. If more than one extinguisher is used simultaneously, work in unison with the other firefighters. D. Most fire departments do not carry fire extinguishers but firefighters may be required to use those provided by a facility or business.

Answer 36

C. If more than one extinguisher is used simultaneously, work in unison with the other firefighters.

Question 37

What is NOT a consideration for using extinguishers for suppressing incipient fires of all classes? (268) [4.3.16] A. Adverse winds can limit the reach of an agent. B. Apply the agent from a point where it reaches and also disrupts the fuel surface. C. After the fire diminishes, you may move closer to allow the fire extinguishment. D. Be sure the extinguishing agent reaches the fire; if it cannot, the agent will be wasted.

Answer 37

B. Apply the agent from a point where it reaches and also disrupts the fuel surface.