BC Ch.5 Defintions
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Questions and Answers

What is autoexposure in the context of fire behavior?

  • The vertical spread of fire on the exterior of a multistory building from one floor to the floors above (correct)
  • The spontaneous ignition of a material without a flame
  • The horizontal spread of fire within a single room
  • The process of oxygen being drawn into a fire

    • What does autoignition refer to?

  • The deliberate ignition of a material using a flame or spark
  • The transfer of heat through direct contact
  • The spontaneous ignition of a combustible material without the application of a flame or spark (correct)
  • The gradual heating of a material until it reaches its flash point

    • What is a backdraft?

  • The spread of fire through horizontal ventilation
  • The movement of cooler air into a fire compartment
  • The ignition of flammable gases at the ceiling layer
  • The explosive burning of heated gaseous products of combustion when oxygen is introduced into an oxygen-depleted environment (correct)

    • What is bagasse?

    <p>Low-density fiberboard made of wood fibers or sugar cane residue</p> Signup and view all the answers

    What is batt insulation?

    <p>Fiberglass or rock wool insulation with various thicknesses; it may or may not have a paper covering</p> Signup and view all the answers

    What does bi-directional flow describe in fire dynamics?

    <p>Fire spread occurring in two opposite directions simultaneously</p> Signup and view all the answers

    What are the characteristics of backdraft conditions?

    <p>High temperature and low oxygen concentration in the fire area</p> Signup and view all the answers

    In terms of fire safety, what is essential about the material bagasse?

    <p>It may be flammable and requires careful handling in fire-prone areas.</p> Signup and view all the answers

    What is a fire plume?

    <p>The column of flames, smoke, and heated gases rising above the burning object</p> Signup and view all the answers

    What is flashover?

    <p>The simultaneous ignition of all exposed surfaces in a compartment, resulting in full room involvement</p> Signup and view all the answers

    What is the neutral plane in a fire compartment?

    <p>The layer where hot and cool air meet, typically between the ceiling and floor</p> Signup and view all the answers

    What is the primary danger of a backdraft?

    <p>The explosive ignition of heated gases when oxygen is introduced into an oxygen-depleted environment</p> Signup and view all the answers

    What is an uninhibited chemical chain reaction in fire dynamics?

    <p>A sustained oxidation reaction that produces sufficient excess heat to continue heating unburned fuel, making it available for combustion</p> Signup and view all the answers

    What is the role of an oxidizing agent in fire dynamics?

    <p>To provide oxygen or other oxidizers to sustain combustion</p> Signup and view all the answers

    What is the composition of smoke?

    <p>The airborne solid and liquid particulates and gases produced by a fire</p> Signup and view all the answers

    What is the ceiling layer in a fire?

    <p>The hot, buoyant gases that collect at the very top of a room</p> Signup and view all the answers

    What does the term 'flameover' describe?

    <p>The ignition of fuel gases at the ceiling layer</p> Signup and view all the answers

    What does radiation refer to in the context of heat transfer?

    <p>The transfer of heat through electromagnetic waves</p> Signup and view all the answers

    What describes the method by which cooler air enters a compartment while hot gases exit?

    <p>The movement of cooler air into a compartment through the lower portion of an opening while hot gases exit through the upper portion</p> Signup and view all the answers

    What constitutes the ceiling layer during a fire?

    <p>The hot, buoyant gases that collect at the very top of a room</p> Signup and view all the answers

    What is meant by combustible acoustical tile?

    <p>Fiberboard that is often used for soundproofing but is combustible</p> Signup and view all the answers

    How does conduction transfer heat?

    <p>By heat traveling through direct contact between objects</p> Signup and view all the answers

    Which method describes convection in heat transfer?

    <p>The transfer of heat through circulation within a medium such as a gas or liquid</p> Signup and view all the answers

    What does the term entrainment refer to in fire dynamics?

    <p>The process of oxygen being drawn into a fire</p> Signup and view all the answers

    What is a fire plume?

    <p>The column of flames, smoke, and heated gases rising above the burning object</p> Signup and view all the answers

    What is flashover in fire behavior?

    <p>The transition stage where all exposed surfaces ignite simultaneously</p> Signup and view all the answers

    What role does heat play in fire dynamics?

    <p>It is a form of energy that initiates combustion</p> Signup and view all the answers

    What accurately defines low-density fiberboard?

    <p>A product made of wood particles, often used for soundproofing</p> Signup and view all the answers

    What is understood by matchboarding in construction?

    <p>A decorative finish for interior walls</p> Signup and view all the answers

    What is the neutral plane in the context of a fire compartment?

    <p>The interface between hot gases and cooler air</p> Signup and view all the answers

    What constitutes an oxidizing agent in fire dynamics?

    <p>A compound that releases oxygen as it reacts</p> Signup and view all the answers

    What does piloted ignition refer to?

    <p>The ignition of heated combustible materials by a flame or spark</p> Signup and view all the answers

    What defines polychlorinated biphenyls (PCBs)?

    <p>Toxic chemicals utilized as nonflammable coolants that are released in fires</p> Signup and view all the answers

    What is the primary use of polyvinyl chloride (PVC)?

    <p>An electrical insulator with low flammability in transformers</p> Signup and view all the answers

    What does radiation refer to in heat transfer?

    <p>The transfer of heat through electromagnetic waves</p> Signup and view all the answers

    Study Notes

    Fire Dynamics and Behavior Terms

    • Autoexposure: Refers to fire spreading vertically on exterior walls of multistory buildings from one floor to another.
    • Autoignition: The spontaneous ignition of combustible materials without external flame or spark.
    • Backdraft: An explosive ignition of heated gases when oxygen enters an oxygen-depleted fire environment.
    • Bagasse: Low-density fiberboard made from sugar cane residue, often used in construction and insulation.
    • Batt Insulation: Composed of fiberglass or rock wool, available in various thicknesses; sometimes has a paper covering.
    • Bi-directional Flow: Describes cooler air entering a fire compartment from below while hot gases exit from above.
    • Ceiling Layer: The layer of hot, buoyant gases that accumulates at the top of a room during a fire.
    • Combustible Acoustical Tile: Fiberboard tiles with perforations used for soundproofing; may ignite at high temperatures.
    • Conduction: Heat transfer occurring through direct contact between materials or within an object.
    • Convection: Heat transfer due to circulation within gases or liquids, allowing heat to move throughout a medium.
    • Entrainment: Process where oxygen is drawn into a fire, fueling combustion.
    • Fire Plume: A column of flames, smoke, and hot gases rising from the fire's base, indicating fire intensity.
    • Flameover: Known as rollover, where fires ignite gases at the ceiling level.
    • Flashover: A critical phase where all exposed surfaces in a room ignite simultaneously, leading to total involvement.
    • Fuel: Any material that can sustain combustion, essential for fire progression.
    • Heat: Serves as energy necessary for ignition and further combustion processes.
    • Low-Density Fiberboard: Made from bound wood particles, often used for decorative finishes in interiors.
    • Matchboarding: A method of creating decorative finishes using embossed materials on walls.
    • Neutral Plane: The interface between hot, rising gases at the ceiling and cooler air descending from below.
    • Oxidizing Agent: Typically atmospheric oxygen that sustains combustion, can also include chemical oxidizers.
    • Piloted Ignition: Occurs when a heated combustible material ignites upon exposure to a flame or spark.
    • Polychlorinated Biphenyls (PCBs): Toxic chemicals formerly found in electrical equipment that may become hazardous during fires.
    • Polyvinyl Chloride (PVC): Low-flammability electrical insulator often used in building and industrial applications.
    • Radiation: Heat transfer through electromagnetic waves, independent of contact or material medium.
    • Rigid-Foamed Polyurethane: A cellular foam used for interior finishes and insulation, not fireproof.
    • Robertson Protected Metal: Asphalt-coated steel employed in construction, providing certain fire resistance.
    • Smoke Composition: A mix of airborne solid, liquid particulates, and gases produced during combustion.
    • Uninhibited Chemical Chain Reaction: Continuous oxidation producing excess heat, enabling unburned fuel to ignite.
    • Backdraft Danger: Potential for explosive ignition when oxygen is introduced to smoldering gases.
    • Smoke Barrier: Constructs designed to limit smoke movement and distribution in buildings.
    • Fire Prevention Terminology: Understanding flashover and the neutral plane is crucial in fire dynamics for effective response.

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    Description

    Test your knowledge on important fire dynamics and behavior terminology. This quiz covers essential concepts like autoexposure, autoignition, and backdraft, along with the materials used in fire safety. Enhance your understanding of fire behavior in various environments.

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