BC Ch. 5 Terms
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Questions and Answers

What is autoexposure in the context of a building fire?

  • The horizontal spread of fire within a single floor
  • The rapid extinguishing of a fire
  • The explosion of a fire confined to a single room
  • The vertical spread of fire on the exterior of a multistory building from one floor to the floor(s) above via convection and radiation (correct)

    • What is autoignition?

  • A phenomenon where a combustible material ignites spontaneously without a flame or spark (correct)
  • The use of chemical fire starters
  • The explosion of a gas container
  • The ignition of a material by a direct flame

    • What is a backdraft?

  • The explosive burning of heated gaseous products of combustion when oxygen is introduced into an oxygen-depleted environment (correct)
  • A controlled fire suppression technique
  • The sudden extinguishing of a fire due to lack of oxygen
  • The normal airflow in a ventilated building

    • What is bagasse used for in construction?

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

    Which of the following describes the term 'combustible material'?

    <p>Items that can spontaneously ignite under certain conditions</p> Signup and view all the answers

    What is the primary benefit of batt insulation in buildings?

    <p>To enhance energy efficiency through thermal resistance</p> Signup and view all the answers

    Which of the following best defines thermal resistance?

    <p>The measure of a material's ability to resist heat transfer</p> Signup and view all the answers

    What hazard is associated with autoignition?

    <p>Unexpected fires that can occur without any apparent external cause</p> Signup and view all the answers

    What is fiberglass insulation typically characterized by?

    <p>It may have a paper covering.</p> Signup and view all the answers

    What defines bi-directional flow in a fire situation?

    <p>The entry of cooler air at the bottom and exit of hot gases at the top.</p> Signup and view all the answers

    What is described as the hot, buoyant gases at the top of a room?

    <p>The ceiling layer.</p> Signup and view all the answers

    What accurately describes combustible acoustical tile?

    <p>Fiberboard with punched holes.</p> Signup and view all the answers

    What process is referred to as conduction in heat transfer?

    <p>Transfer of heat through direct contact.</p> Signup and view all the answers

    In fire behavior, how is convection defined?

    <p>The transfer of heat through circulation in a gas or liquid.</p> Signup and view all the answers

    What does entrainment in fire dynamics refer to?

    <p>The process of air being pulled into the fire.</p> Signup and view all the answers

    What constitutes a fire plume?

    <p>A column of flames and heated gases rising above a burning object.</p> Signup and view all the answers

    What is meant by flameover in fire dynamics?

    <p>Ignition of unburned gases at the ceiling layer.</p> Signup and view all the answers

    What stage does flashover describe in fire behavior?

    <p>Simultaneous ignition of all exposed surfaces.</p> Signup and view all the answers

    What is the definition of fuel in fire safety?

    <p>Any material that sustains combustion.</p> Signup and view all the answers

    What is identified as heat in fire dynamics?

    <p>Energy that can initiate ignition.</p> Signup and view all the answers

    What describes low-density fiberboard used in construction?

    <p>Made of wood particles bound by a suitable binder.</p> Signup and view all the answers

    What constitutes matchboarding in construction?

    <p>Embossed steel and wooden board ceilings.</p> Signup and view all the answers

    What does the neutral plane signify in fire dynamics?

    <p>Interface between hot gases and cooler air.</p> Signup and view all the answers

    What is an oxidizing agent in the context of fire chemistry?

    <p>Normally atmospheric oxygen and reactive chemical compounds.</p> Signup and view all the answers

    What describes the ignition of a heated combustible material when a flame or spark is applied?

    <p>Ignition of a heated combustible material when a flame or spark is applied</p> Signup and view all the answers

    What risk is associated with polychlorinated biphenyl (PCB) as a coolant in transformers?

    <p>It may release toxic chemicals during fires</p> Signup and view all the answers

    What is polyvinyl chloride (PVC) primarily used for in construction?

    <p>An organic compound used in transformers and capacitors</p> Signup and view all the answers

    In the context of fire dynamics, how is radiation defined?

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

    What material is identified as rigid-foamed polyurethane?

    <p>Cellular foam plastic used as an interior finish</p> Signup and view all the answers

    What characterizes Robertson protected metal?

    <p>Asphalt-coated steel</p> Signup and view all the answers

    How is smoke defined within the context of fire safety?

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

    What does an uninhibited chemical chain reaction in fire dynamics entail?

    <p>A sustained oxidation reaction generating heat for combustion</p> Signup and view all the answers

    Study Notes

    Autoexposure

    • Refers to the vertical spread of fire on the exterior of a multistory building through convection and radiation to upper floors.

    Autoignition

    • A phenomenon where combustible materials spontaneously ignite without the presence of flame or spark.

    Backdraft

    • An explosive reaction that occurs when oxygen is introduced into a previously oxygen-depleted environment containing heated gases from combustion.

    Bagasse

    • Low-density fiberboard created from wood fibers or sugar cane residue, used as a building material.

    Batt Insulation

    • Made from fiberglass or rock wool, available in various thicknesses; can be covered with paper for added insulation properties.

    Bi-Directional Flow

    • Describes the movement of cooler air entering a compartment at lower openings while hot fire gases exit through upper openings.

    Ceiling Layer

    • The hot, buoyant gases that accumulate at the top of a room during a fire.

    Combustible Acoustical Tile

    • Made of fiberboard with punched holes, these tiles can contribute to fire risk as they are not classified as flame-retardant.

    Conduction

    • The process of heat transfer through direct contact between materials or within an object.

    Convection

    • Heat transfer occurring through the circulation of gases or liquids, crucial in the spread of fire.

    Entrainment

    • The process by which oxygen (air) is drawn into a fire, supporting combustion.

    Fire Plume

    • A vertical column consisting of flames, smoke, and heated gases rising above a burning object.

    Flameover

    • The ignition of unburned fuel gases that collect at the ceiling layer; also known as rollover.

    Flashover

    • A critical transition in a fire where all exposed surfaces ignite simultaneously, leading to full room involvement.

    Fuel

    • Any material that maintains combustion; essential for sustaining a fire.

    Heat

    • A form of energy that serves as the primary source for ignition in fire dynamics.

    Low-Density Fiberboard

    • An interior finish material composed of wood particles bound together; lightweight and often used in construction.

    Matchboarding

    • Refers to ceilings constructed from embossed steel paired with wooden boards, combining aesthetic and structural properties.

    Neutral Plane

    • The boundary layer between hot gases at the ceiling and cooler air entering the compartment, significant for smoke movement analysis.

    Oxidizing Agent

    • Generally atmospheric oxygen, also includes chemicals that release oxygen when they react, vital in sustaining combustion.

    Piloted Ignition

    • The ignition process where a flame or spark ignites a heated combustible material, differing from autoignition.

    Polychlorinated Biphenyl (PCB)

    • Used as a nonflammable coolant in transformers but poses risks as it may release toxic chemicals during fires.

    Polyvinyl Chloride (PVC)

    • An organic compound prevalent in construction due to its electrical insulating properties and low flammability, utilized in transformers and capacitors.

    Radiation

    • The heat transfer method involving electromagnetic waves, significant in understanding fire spread mechanisms.

    Rigid-Foamed Polyurethane

    • A type of cellular foam plastic commonly used as an interior finish, providing insulation and design benefits.

    Robertson Protected Metal

    • Asphalt-coated steel utilized for its protective properties in construction applications.

    Smoke

    • Comprised of solid and liquid particulates and gases produced during combustion; understanding its characteristics is critical for fire safety.

    Uninhibited Chemical Chain Reaction

    • A sustained oxidation process that produces enough heat to keep unburned fuel available for combustion, enabling fire continuity.

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    Test your knowledge of key fire safety terms with this quiz. Each question focuses on crucial concepts such as autoexposure and its implications in building fires. Ideal for those seeking to better understand fire dynamics and safety measures.

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