NFPA 921 Chapter 6 Fire Patterns || with 100% Errorless Solutions.
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Course
NFPA 921
Institution
NFPA 921
burning ____________ and highly _______________ reactions can produce temperatures significantly higher than those created by hydrocodone and cellulosic fuel fires correct answers metals and exothermic
________________ temperatures rarely remain above 1900 degress F correct answers identifiable
...
NFPA 921 Chapter 6 Fire Patterns || with 100% Errorless
Solutions.
burning ____________ and highly _______________ reactions can produce temperatures
significantly higher than those created by hydrocodone and cellulosic fuel fires correct answers
metals and exothermic
melted materials used to establish the _________________ present in specific areas correct
answers minimum tempertatures
materials may lose mass by three methods correct answers evaporation - calcination -
sublimation
depth of charing is more reliable for evaluating correct answers fire spread
spalling is believed to be attributed to release of moisture , different expansion of metal and
current different e correct answers release of moisture, different expansion of metal and cement
different expansion of cement and aggregates different temperature in core and exposed portion
to Flame
spalled areas may appear to be what color correct answers lighter in color
the effects of oxidation include change of ________ and change of _________ correct answers
color / texture
where uncoated iron or steel is oxidized in a fire the surface first acquires a ______________
correct answers blue gray dullness
at elevated temperatures iron may also combine with oxygen to form black ____________
correct answers oxides
heavily oxidized steel may exhibit a visual appearance similar to correct answers melting
a ____________ of a polished each cross section necessary to make a determination of melted
steel correct answers metallurgical examination
when exposed to heat ___________ forms a dark red or black oxide correct answers copper
melting temperatures of common ________ range from 338 to 1460 F correct answers metals
_____________ soften and melt over a range of temperatures 167 to 750 F correct answers
thermoplastics
, deformation of __________ beams and columns occurs at what temperature 900 degrees correct
answers steel
the higher the coefficient thermal expansion of the metal the more prone it is to ____________
correct answers heat distortion
locally heated portions of plaster walls and ceilings may ___________ and ___________ from
their support lath correct answers expand / separate
chemical analysis of the smoke deposit may indicate the ____________ of the fuel correct
answers nature
direction of fire spread and differences in ______________ of burn can be determined by lines
of demarcation between clean burn and darkened areas correct answers intensity time of burn
the difference between clean burning and spalling is clean burns do no show the loss of
_______________ that is characterstic of spalling correct answers surface material
during calcination gypsum becomes another mineral correct answers anhydrate
preserve the strength of the wallboard during the fire exposure correct answers mineral fibers or
vermiculite particles
a temperature difference of about 126 degrees between the center of the pain of glass and the
protected edge can cause what correct answers cracks that start at the edge of the glass
a complicated pattern of short cracks in glass correct answers crazing
crazing can only be caused by correct answers rapid cooling
broken more uniformly shape than the complicated pattern of short cracks of crazing correct
answers tempered glas
glass fragments that are free of soot or condensates have likely been subjected to ___________
failure early in the fire prior to the fire flame contact or may have been the exterior
______________ of double or triple pane windows correct answers rapid Heating / glazing
incadescent light bulbs greater than 25 watt sometimes show the _________ of heat
impingement correct answers direction
bulbs of 25 watts or less can be ___________ on the side in the direction of the source of the
heating due to ___________ correct answers pulled inward / vaccume
skin can blister from either ___________ or ____________ exposure correct answers pre-
mortem or post-mortem
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