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NFPA 921 Exam Definitions Q&A 100% Solved | Graded A+
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NFPA 921 Exam Definitions Q&A 100% Solved | Graded A+ Absolute Temperature. - A temperature measured in Kelvins (K) or Rankines (R). Accelerant. - A fuel or oxidizer, often an ignitible liquid, intentionally used to initiate a fire or increase the rate of growth or spread of fire. Accident. -...

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  • October 25, 2024
  • 27
  • 2024/2025
  • Exam (elaborations)
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
NFPA 921 Exam Definitions Q&A 100%

Solved | Graded A+


Absolute Temperature. - ✔✔A temperature measured in Kelvins (K) or

Rankines (R).

Accelerant. - ✔✔A fuel or oxidizer, often an ignitible liquid, intentionally

used to initiate a fire or increase the rate of growth or spread of fire.

Accident. - ✔✔An unplanned event that interrupts an activity and

sometimes causes injury or damage or a chance occurrence arising from

unknown causes; an unexpected happening due to carelessness,

ignorance, and the like.

Ambient. - ✔✔Someone's or something's surroundings, especially as they

pertain to the local environment; for example, ambient air and ambient

temperature.

Ampacity. - ✔✔The maximum current, in amperes, that a conductor can

carry continuously under the conditions of use without exceeding its

temperature rating. [70, Article 100]

,©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Ampere. - ✔✔The unit of electric current that is equivalent to a flow of one

coulomb per second; one coulomb is defined as 6.24 × 1018 electrons.

Arc. - ✔✔A high-temperature luminous electric discharge across a gap or

through a medium such as charred insulation.

Arc Mapping. - ✔✔The systematic evaluation of the electrical circuit

configuration, spatial relationship of the circuit components, and

identification of electrical arc sites to assist in the identification of the area

of origin and analysis of the fire's spread.

Arc Site. - ✔✔The location on a conductor with localized damage that

resulted from an electrical arc.

Arcing Through Char. - ✔✔Arcing associated with a matrix of charred

material (e.g., charred conductor insulation) that acts as a semiconductive

medium.

Area of Origin. - ✔✔A structure, part of a structure, or general geographic

location within a fire scene, in which the "point of origin" of a fire or

explosion is reasonably believed to be located. (See also 3.3.132, Point of

Origin.)

Arrow Pattern. - ✔✔A fire pattern displayed on the cross-section of a

burned wooden structural member.

, ©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Arson. - ✔✔The crime of maliciously and intentionally, or recklessly,

starting a fire or causing an explosion.

Autoignition. - ✔✔Initiation of combustion by heat but without a spark or

flame.

Autoignition Temperature. - ✔✔The lowest temperature at which a

combustible material ignites in air without a spark or flame.

Backdraft. - ✔✔A deflagration resulting from the sudden introduction of air

into a confined space containing oxygen-deficient products of incomplete

combustion.

Bead. - ✔✔A rounded globule of re-solidified metal at the end of the

remains of an electrical conductor that was caused by arcing and is

characterized by a sharp line of demarcation between the melted and

unmelted conductor surfaces.

Blast Pressure Front. - ✔✔The expanding leading edge of an explosion

reaction that separates a major difference in pressure between normal

ambient pressure ahead of the front and potentially damaging high

pressure at and behind the front.

BLEVE. - ✔✔Boiling liquid expanding vapor explosion.

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