Fire Fighting Foam Chapter 16 Test
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Fire Fighting Foam Chapter 16 Test

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Questions and Answers

Which action of fire fighting foam creates a barrier between the fuel and the fire?

  • Separating (correct)
  • Cooling
  • Penetrating
  • Aerating

    • Foam lowers the surface tension of water, allowing it to ___ fires in Class A materials.

  • cool
  • penetrate (correct)
  • smother
  • suppress

    • Class A foam extinguishes and/or prevents ignition by:

  • lowering the temperature of the fuel and adjacent surfaces.
  • allowing water to penetrate fuels. (correct)
  • preventing air from reaching the fuel or mixing with vapors.
  • creating a barrier between the fuel and the fire.

    • Which of the following statements about fire fighting foams is MOST accurate?

    <p>Foam works by forming a blanket of foam on the surface of burning liquid and solid fuels.</p> Signup and view all the answers

    When applied to solid fuels, Class A foam blankets the fuel, controls flames, then:

    <p>breaks down, releasing water to cool the fuel.</p> Signup and view all the answers

    Class B foams are especially effective on:

    <p>hydrocarbon fuels and polar solvents.</p> Signup and view all the answers

    Which of the following statements about fire fighting foams is MOST accurate?

    <p>Air is added to the foam solution by mechanical agitation.</p> Signup and view all the answers

    The degree of foam expansion depends on the type of foam concentrate, accurate proportioning, quality of the foam concentrate and:

    <p>method of aeration.</p> Signup and view all the answers

    Which classification of foam is used to suppress vapors from hazardous materials spills?

    <p>Medium-expansion foam</p> Signup and view all the answers

    High-expansion foam is typically used for:

    <p>confined spaces such as mines and shipboard compartments.</p> Signup and view all the answers

    Which of the following statements about Class A foam concentrates is MOST accurate?

    <p>Class A foam reduces the surface tension of water, allowing better water penetration into the fuel.</p> Signup and view all the answers

    Flammable liquids that mix readily with water are:

    <p>polar solvents.</p> Signup and view all the answers

    Which Class B foams are made from a mixture of fluorosurfactants?

    <p>Synthetic foams</p> Signup and view all the answers

    Which foams are required to extinguish fires of ethanol or ethanol-based fuels?

    <p>Alcohol-resistant foams</p> Signup and view all the answers

    Which of the following statements about foam concentrates is MOST accurate?

    <p>Foam application rates are different for each type of polar solvent.</p> Signup and view all the answers

    Why are specialized foams designed solely for use on unignited spills of hazardous liquids?

    <p>Unignited chemicals tend to change the pH of water or remove the water from fire fighting foam, making the foam ineffective.</p> Signup and view all the answers

    Most foam concentrates are intended to be mixed with what percent of water?

    <p>94 to 99.9</p> Signup and view all the answers

    Which of the following statements about foam proportioning is MOST accurate?

    <p>Mixing Class A foam at a higher recommended percentage results in a thick, dry foam.</p> Signup and view all the answers

    Multipurpose Class B foams are normally mixed at a 6 percent rate when:

    <p>applied to polar solvents.</p> Signup and view all the answers

    Factors to consider in selecting a foam proportioner include solution flow requirements, intended use, and:

    <p>available water pressure.</p> Signup and view all the answers

    Which of the following proportioning methods depends on the Venturi Principle to draw foam through a hose connected to the foam concentrate container and into the water stream?

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

    The proportioning method which uses an external pump or head pressure to force foam concentrate into the fire stream is:

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

    Which of the following proportioning methods makes it difficult to refill an apparatus water tank due to excessive bubbling from residual foam solution?

    <p>Batch-mixing</p> Signup and view all the answers

    Because the foam solution goes through the pump, the proportioning method may cause the pump to require additional maintenance.

    <p>Batch-mixing</p> Signup and view all the answers

    Which of the following statements about foam proportioners and delivery systems is MOST accurate?

    <p>The foam proportioner and delivery system must be compatible to produce usable foam.</p> Signup and view all the answers

    Which of the following foam proportioners may compromise firefighter safety since it is difficult to quickly relocate the components?

    <p>Foam nozzle eductor</p> Signup and view all the answers

    When using an in-line eductor, which of the following might cause foam concentrations to be too lean?

    <p>Foam concentrate inlet too far above surface of foam concentrate.</p> Signup and view all the answers

    Installed in-line eductors, around-the-pump proportioners, and balanced pressure proportioners are examples of:

    <p>apparatus-mounted proportioners.</p> Signup and view all the answers

    Which of the following statements about compressed air foam systems (CAFS) is MOST accurate?

    <p>Foam produced by CAFS adheres well to vertical surfaces.</p> Signup and view all the answers

    Which of the following statements about foam delivery devices is MOST accurate?

    <p>Air-aspirating foam nozzles are the most effective appliance for generation of low-expansion foam.</p> Signup and view all the answers

    Which of the following foam generators produces foam by pumping foam solution through the nozzle in a fine spray?

    <p>Water-aspirating type nozzle</p> Signup and view all the answers

    Air-aspirating nozzles must be used with:

    <p>protein and fluoroprotein concentrates.</p> Signup and view all the answers

    Which of the following foam generators is typically associated with total-flooding applications?

    <p>Mechanical blower generator</p> Signup and view all the answers

    Poor-quality foam may result from:

    <p>air leaks at fittings causing a loss of suction.</p> Signup and view all the answers

    A common reason for generating poor-quality foam is:

    <p>mixing different types of foam concentrate in the same tank.</p> Signup and view all the answers

    In which application method does the operator direct the foam stream onto an elevated object, allowing the foam to run down and onto the surface of the fuel?

    <p>Bank-down method</p> Signup and view all the answers

    Which of the following is used only on a pool of ignited or unignited fuel on the ground?

    <p>Roll-on method</p> Signup and view all the answers

    Which of the following is the primary application technique used on aboveground storage tank fires?

    <p>Bank-down method</p> Signup and view all the answers

    Which of the following statements about foam hazards is MOST accurate?

    <p>Some foam concentrates and their vapors may be harmful if inhaled.</p> Signup and view all the answers

    Which of the following statements about finished foam in the environment is MOST accurate?

    <p>In a body of water, decomposing foam can reduce the oxygen available to fish and other aquatic creatures.</p> Signup and view all the answers

    Study Notes

    Fire Fighting Foam Fundamentals

    • Separation by fire fighting foam creates a barrier between fuel and fire, inhibiting combustion.
    • Foam lowers water's surface tension, enabling it to penetrate Class A fire materials.

    Class A Foam Characteristics

    • Class A foam allows water to effectively penetrate fuels, extinguishing or preventing ignition.
    • It forms a protective blanket, controlling flames and enabling cooling by breaking down over the fuel.

    Class B Foam Usage

    • Class B foams are particularly effective on hydrocarbon fuels and polar solvents.
    • Multipurpose Class B foams are typically mixed at a 6 percent rate when applied to polar solvents.

    Foam Expansion and Aeration

    • The degree of foam expansion is influenced by the type of foam concentrate and the method of aeration.
    • Proper aeration produces bubbles of varying sizes, crucial for foam effectiveness.

    Foam Application Techniques

    • High-expansion foam is primarily used in confined spaces like mines and shipboard compartments.
    • Banking down method involves directing foam onto elevated objects for effective coverage of ignited fuels.

    Foam Proportioning Methods

    • Eduction depends on the Venturi Principle, drawing foam through a hose into the water stream.
    • Injection uses an external pump to force foam concentrate into the fire stream.

    Safety Considerations

    • Some foam concentrates and their vapors can be harmful if inhaled, necessitating safety precautions.
    • It's important to flush exposed skin with water to avoid irritation from foam concentrates.

    Environmental Impact

    • Decomposing foam in water bodies can decrease oxygen levels, affecting aquatic life.
    • Regulations often require Class A foams to be approved for environmental safety by agencies like the U.S. Fish and Wildlife Service.

    Quality and Maintenance

    • Poor-quality foam may result from air leaks in fittings or mixing incompatible foam concentrates.
    • Foam proportioners and delivery systems must be compatible to ensure effective foam production.

    Application Methods

    • The roll-on method is designed for pools of ignited or unignited fuel.
    • The bank-down method is essential for aboveground storage tank fires, providing controlled foam coverage.

    Foam Concentrate Types

    • Alcohol-resistant foams are needed for extinguishing ethanol or ethanol-based fuels.
    • Synthetic foams contain mixtures of fluorosurfactants, enhancing performance against flammable liquids.

    Important Foam Metrics

    • Most foam concentrates are designed to mix with 94 to 99.9 percent water.
    • Class A foam can become thick and dry if mixed at higher than recommended percentages, affecting efficacy.

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    Description

    Test your knowledge about the properties and actions of fire fighting foam with this flashcard quiz. Each card covers important definitions and concepts to help reinforce your understanding of fire suppression techniques. Perfect for anyone studying fire safety and prevention.

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