Fire Investigator: Principles and Practice to NFPA 921 and 1033, Fourth Edition-Questions and Verified Answers/Latest 2023/2024
Fire Investigator:
... [Show More] Principles and Practice to
NFPA 921 and 1033, Fourth EditionQuestions and Verified Answers/Latest
2023/2024
Accelerant
Any fuel or oxidizer, often an ignitable liquid, used to initiate a fire or increase the
rate of growth or speed the spread of fire.
Accidental Fires
Fires for which the proven cause does not involve an intentional human act to
ignite or spread fire into an area where the fire should not be.
Accommodation Space
A space on a vessel designed for people to live in.
Active Fire Protection System
Any type of fire protection system that automatically activates upon detection of a
fire condition.
Addressable Technology
Fire alarm and detection systems in which devices and system components are
assigned a data address, are capable of two-way communication, and can perform
certain activities based on signal input.
Adolescent Firesetters
Adolescents, ages 14 to 16 years, who are often responsible for fires that occur at
places other than their homes.
Adrift
Loose, not on moorings or towline.
Aerial Fuels
All green or dead materials located in the forest canopy.
Affidavit
A voluntary written statement of fact or opinion made under oath and signed by the
author.
Afloat
Floating in water; not sinking.
Air Drop
The aerial application of water, foam, or retardant mixture directly onto the fire or
threatened area or along a strategic position ahead of the fire.
Air Entrainment
The process of air or gases being drawn into a fire, plume, or jet.
Air Sampling Smoke Detection
A method of smoke detection designed to draw air from the protected area into a
detection chamber for analysis.
Alarm Pressure Switch
A type of initiating device installed on all types of wet-based fire suppression
systems; the device initiates a fire alarm signal once a water pressure threshold is
met.
Alarm Signal
A warning signal that alerts occupants of a fire emergency.
Alloying
The mixture of two or more metals in which one or more of the metals is in a
liquefied state.
Alternating Current (AC)
The voltage varies in time with a sine wave at 60 cycles per second. A sine-wave
current results if the load is resistive.
Ambient Temperature
Air temperature of the surrounding environment.
Ampacity
The current, in amperes, that a conductor can carry continuously under the
conditions of use without exceeding its temperature rating.
Amperage
The unit of electric current that is equivalent to a flow of one coulomb per second;
one coulomb is defined as 6.24 x 10^18 (18th power) electrons.
Annunciation Panel
A device that uses indicating lamps, alphanumeric displays, or other means to
provide first responders with status, condition, and location information concerning
fire alarm system components and devices.
Arc Mapping
The analysis of the locations where electrical arcing has caused damage and the
documentation of the involved electrical circuits.
Arc Survey Diagrams
Locations of electrical arcing are identified and plotted on a diagram of the
affected area of the structure. The spatial relationship of the arc sites can create a
pattern and help establish the sequence of damage. This analysis can be used on
building circuits and electrical devices within a compartment to help identify or
narrow the area of origin.
Arc Tube
A cylinder of fused silica/quartz with electrodes at either end that is used in most
mercury and metal halide lamps.
Arc
A high-temperature luminous electric discharge across a gap where the conductor
is missing or through a medium such as charred insulation.
Arced and Severed
Occurs when wires are arced off on the ends and possible segmented wires result.
Arc-Fault Circuit Interrupter (AFCI)
Designed to protect against fires caused by arcing faults in home electrical wiring.
The circuitry continuously monitors current flow.
Area of Origin
The room, building, or general area in which the point of origin is located.
Arson
The crime of maliciously and intentionally, or recklessly, starting a fire or causing
an explosion. Legal definitions of "arson" are defined by statues and judicial
decisions that vary among jurisdictions.
Aspect
The direction the slope faces (N, E, S, W).
Assemblies
Manufactured parts put together to make a completed product.
Autoignition Temperature (AIT)
The lowest temperature at which a combustible material ignites in air without a
spark or flame.
Backflow Valve
Prevents gas from re-entering a container or combustion system.
Balanced Pressure Proportioner
A proportioner that uses an atmospheric tank and pump to introduce the foam
concentrate into the system with the water supply.
Balloon Frame Construction
A construction type in which the exterior wall studs go from the foundation wall to
the roofline. The floor joists are attached to the walls by the use of a ribbon board,
which creates an open stud channel between floors, including the basement and
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