Fire Safety: Extinguisher Classifications
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Questions and Answers

A Class A fire extinguisher with a numerical rating of 2 contains __ gallon of water

2.5

A Class B foam extinguisher is not rated for which fuel?

Cooking oil

A Class C agent must

not conduct electricity

A Class C extinguisher is rated for use on

<p>energized electrical equipment</p> Signup and view all the answers

A Class K agent's effect on the fuel is known as

<p>saponification</p> Signup and view all the answers

A fire extinguisher's agent is stored within its

<p>cylinder</p> Signup and view all the answers

A loaded stream extinguisher is designed to

<p>resist freezing</p> Signup and view all the answers

A portable fire extinguisher is best suited for which situation?

<p>Fire in a wastebasket</p> Signup and view all the answers

A potential problem with application of a multipurpose dry chemical agent to a Class K fire is

<p>neutralization of other agents applied to the fire</p> Signup and view all the answers

According to NFPA 10, the maximum floor area that can be protected by each extinguisher depends on the

<p>occupancy type</p> Signup and view all the answers

All fire extinguishers are classified according to

<p>the classes of fire on which they are effective</p> Signup and view all the answers

All portable fire extinguishers use which means for expelling their contents?

<p>pressure</p> Signup and view all the answers

Bromochlorodifluoromethane is a ___ agent

<p>halogenated</p> Signup and view all the answers

Class D agents work primarily by

<p>forming a crust over the fuel</p> Signup and view all the answers

Combustion begins when a fuel is heated to its

<p>ignition point</p> Signup and view all the answers

Dry chemical extinguishers may be used on Class C fires because they

<p>do not conduct electricity</p> Signup and view all the answers

For an area to qualify for the classification of 'light hazard,' most of the combustible present must be

<p>arranged so that a fire is unlikely to spread</p> Signup and view all the answers

For an extinguishing agent to be approved for use on energized electrical equipment, it must

<p>be electrically nonconductive</p> Signup and view all the answers

For an extinguishing agent to be rated for a particular class of fire, it must

<p>prevent rekindling</p> Signup and view all the answers

For the purpose of extinguisher selection and placement, a woodworking shop is a(n) ___ hazard environment

<p>extra</p> Signup and view all the answers

For the purpose of extinguisher selection and placement, light hazard environments usually contain amount of combustibles of which class?

<p>B</p> Signup and view all the answers

For the purpose of extinguisher selection and placement, what is an example of a light hazard environment?

<p>classroom</p> Signup and view all the answers

For the purpose of fire extinguisher placement, what is the relationship between occupancy use category and hazard classification?

<p>They are not necessarily related</p> Signup and view all the answers

How do multipurpose dry chemical agents prevent rekindling of Class A fuel?

<p>By forming a crust over the fuel</p> Signup and view all the answers

If a private residence has a single fire extinguisher, where should it be located?

<p>Kitchen</p> Signup and view all the answers

In general, the maximum reach of CO2 extinguisher is __ feet

<p>8</p> Signup and view all the answers

Requirements for placing and mounting portable fire extinguishers are found in NFPA

<p>10</p> Signup and view all the answers

The 'P' in the acronym PASS, used in reference to fire extinguisher operation, stands for

<p>pull</p> Signup and view all the answers

The hydrostatic test interval for a dry chemical extinguisher with a stainless steel shell is every __ years

<p>5</p> Signup and view all the answers

The traditional symbol for a Class D fire extinguisher is a(n)

<p>yellow star</p> Signup and view all the answers

The use of Halon 1211 is strictly controlled because it is

<p>harmful to the environment</p> Signup and view all the answers

The weight of carbon dioxide is about __ the weight of air

<p>one-and-a-half times</p> Signup and view all the answers

To qualify as a light hazard for the purpose of extinguisher selection and placement, the majority of materials in the area must

<p>be noncombustible</p> Signup and view all the answers

What does a rating of 40 on a Class B extinguisher mean?

<p>Sufficient extinguishing power for 40 square feet of burning fuel</p> Signup and view all the answers

What does it mean when a fire extinguisher has a pictograph with a red slash through it?

<p>Use on that class of fire could be hazardous</p> Signup and view all the answers

What expels the extinguishing agent from a pump tank water extinguisher?

<p>manual effort</p> Signup and view all the answers

What is a correct use for a portable fire extinguisher?

<p>Situations in which the use of water is not recommended</p> Signup and view all the answers

What is a primary factor when determining hazard classification for extinguisher selection and placement?

<p>Amount of combustibles present</p> Signup and view all the answers

What is an advantage of portable fire extinguishers over hose lines?

<p>Faster deployment</p> Signup and view all the answers

What is one disadvantage of CO2 extinguishers?

<p>Short discharge range</p> Signup and view all the answers

What is the best way to extinguish a Class C fire?

<p>Shut off the power and treat it as a Class A or B fire</p> Signup and view all the answers

What is the difference between dry powder and dry chemical extinguishing agents?

<p>Each is rated for a different class of fire</p> Signup and view all the answers

What is the most commonly used extinguishing agent for Class A fires?

<p>Water</p> Signup and view all the answers

What is the primary extinguishing mechanism of dry chemical agent?

<p>Interrupting the chemical chain reaction</p> Signup and view all the answers

What is the term for a water-soluble flammable liquid?

<p>Polar solvent</p> Signup and view all the answers

What is the term for the substance that puts out the fire?

<p>Extinguishing agent</p> Signup and view all the answers

What is used to pressurize a stored-pressure water extinguisher?

<p>Compressed air</p> Signup and view all the answers

What residue does a CO2 fire extinguisher leave when discharged?

<p>None</p> Signup and view all the answers

When approaching a fire with an extinguisher in hand, you should always have a(n)

<p>exit route</p> Signup and view all the answers

Which agent is approved for use in a Class K system?

<p>Wet Chemical</p> Signup and view all the answers

Which agent is rated for use on Class A fires?

<p>Ammonium phosphate</p> Signup and view all the answers

Which class of fire extinguisher includes a number in its classification?

<p>A</p> Signup and view all the answers

Which class of fire includes cloth?

<p>A</p> Signup and view all the answers

Which class of fire includes flammable and combustible liquids?

<p>B</p> Signup and view all the answers

Which class of fire involves combustible cooking oils and fats?

<p>K</p> Signup and view all the answers

Which class of fire involves combustible metals?

<p>D</p> Signup and view all the answers

Which class of fire involves energized electrical equipment?

<p>C</p> Signup and view all the answers

Which class of fire is depicted in the pictograph system by a burning trash can next to a wood fire?

<p>A</p> Signup and view all the answers

Which class of fire is depicted in the pictograph system by a fire in a frying pan?

<p>K</p> Signup and view all the answers

Which class of fire is depicted in the pictograph system by a flame and an electrical plug and socket?

<p>C</p> Signup and view all the answers

Which class of fire is depicted in the pictograph system by a flame and gasoline can?

<p>B</p> Signup and view all the answers

Which compound is added to a water extinguisher to improve penetration of fuel?

<p>A wetting agent</p> Signup and view all the answers

Which extinguishing agent is suitable for use on a Class C fire?

<p>Carbon dioxide</p> Signup and view all the answers

Which extinguishing method is being used when a foam blanket is placed over the surface of a burning liquid?

<p>Cutting off the oxygen supply</p> Signup and view all the answers

Which feature of some carbon dioxide extinguishers makes them dangerous for use on Class C fires?

<p>Metal horn</p> Signup and view all the answers

Which fire extinguishing agent is best for use on sensitive electronic equipment?

<p>Carbon dioxide</p> Signup and view all the answers

Which hazard category includes automotive service or repair facilities?

<p>extra</p> Signup and view all the answers

Which motion best accomplishes the removal of the pin and tamper seal from a portable fire extinguisher?

<p>twisting motion</p> Signup and view all the answers

Which of the following is commonly used as a dry chemical extinguishing agent?

<p>ammonium phosphate</p> Signup and view all the answers

Which of the following is one of the three basic components required for fire?

<p>oxygen</p> Signup and view all the answers

Which statement about dry chemical agents is correct?

<p>dry chemical agents are not subject to freezing</p> Signup and view all the answers

Which statement about foam fire extinguishers is correct?

<p>Class B foam extinguisher may be used to some effect on Class A fires</p> Signup and view all the answers

Which statement about the numerical rating of a Class K is correct?

<p>There is no numerical rating for a Class K extinguisher</p> Signup and view all the answers

Which statement best summarizes when a dry chemical extinguisher should be serviced and recharged?

<p>After any discharge</p> Signup and view all the answers

Which statement is correct regarding Class D extinguishing agents?

<p>The specific agent must be matched to the specific fuel</p> Signup and view all the answers

Study Notes

Fire Extinguisher Classifications and Usage

  • Class A fire extinguishers combat ordinary combustibles like wood and cloth; a numerical rating of 2 indicates it can hold 2.5 gallons of water.
  • Class B extinguishers are used for flammable liquids and are ineffective against cooking oil.
  • Class C extinguishers are specifically designed for energized electrical equipment and must not conduct electricity.
  • Class K extinguishers target combustible cooking oils and fats; their action is termed saponification.
  • Class D extinguishers are specialized for combustible metals, bringing unique challenges in firefighting.

Extinguisher Components and Functionality

  • The extinguishing agent in fire extinguishers is stored within a cylinder and is expelled using pressure.
  • A loaded stream extinguisher is resistant to freezing temperatures for reliable operation in cold conditions.
  • CO2 extinguishers typically have a maximum effective range of 8 feet and leave no residue upon discharge.

Extinguisher Placement and Hazard Classification

  • Proper placement of extinguishers depends on occupancy type, with light hazard environments containing fewer combustibles.
  • Areas with a lot of combustibles require extra caution, hence possibly needing extra extinguishing equipment.
  • For safety, a fire extinguisher should be located in the kitchen if found in a private residence.

Fire Chemistry and Safety Measures

  • Combustion begins when fuel reaches its ignition point, emphasizing the importance of heat management.
  • In tackling a Class C fire, the recommended approach is to shut off power sources and treat the scene as a Class A or B fire.
  • Understanding the relationship between occupancy type and hazard classification is crucial; they do not always correlate.

Agent Specifications and Handling

  • Multipurpose dry chemical agents effectively prevent rekindling Class A fuels by forming a crust over them.
  • Each extinguishing agent has distinct properties; for example, halogenated agents like Bromochlorodifluoromethane are highly effective yet environmentally harmful.
  • The hydrostatic testing for certain extinguishers, such as those with stainless steel, occurs every 5 years to ensure integrity.

Extinguisher Operation and Maintenance

  • The acronym PASS (Pull, Aim, Squeeze, Sweep) is essential for proper extinguisher operation, with "P" representing "pull" for removing the pin.
  • A dry chemical extinguisher must be serviced after any use, ensuring readiness for future incidents.
  • Class K extinguishers do not follow a numerical rating system, highlighting their unique safety specifications.

Pictograph Recognition and Chemical Properties

  • Pictographs indicate fire types represented by symbols: a burning trash can for Class A, a frying pan for Class K, and a flame with a gas can for Class B.
  • Understanding the correct extinguishing method, such as using foam for liquid fires, is crucial for effective firefighting.
  • Carbon dioxide extinguishing agents are safe for sensitive electronic equipment due to their non-residuum nature.

Risks and Limitations

  • The use of CO2 extinguishers can be risky on Class C fires due to the potential hazards posed by their metal horns.
  • Some dry chemical agents can interrupt the chemical chain reaction necessary for fire, illustrating their effectiveness; however, they may not be suited for all situations.
  • Advantages of portable extinguishers, including quicker deployment compared to hose lines, should be recognized during selection and training.

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Description

This quiz reviews the classifications and usage of various fire extinguishers. It covers essential details about Class A, B, C, K, and D extinguishers, as well as their components and functionality. Test your knowledge on how to effectively combat different types of fires and the mechanics behind fire extinguishers.

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