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NFPA 921 Chapter 23 explosion || All Correct.
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pressure generated or released in excess of the surrounding ambient pressure correct answers overpressure sudden conversion of potential energy into kinetic energy with the production and release of gas under pressure correct answers explosion whether an explosion occurs depends on the locati...

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  • October 13, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
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NFPA 921 Chapter 23 explosion || All Correct.
pressure generated or released in excess of the surrounding ambient pressure correct answers
overpressure

sudden conversion of potential energy into kinetic energy with the production and release of gas
under pressure correct answers explosion

whether an explosion occurs depends on the location and concentration of diffuse fuels and on
correct answers geometry

preliminary criteria of an explosion is the ____________ and ______________ of gases correct
answers generation / violent Escape

two major types of explosions correct answers mechanical and chemical

the rupture of a closed container cylinder tank boiler or similar strong vessel resulting in the
release of pressurized gas or vapor correct answers mechanical explosion

the type a mechanical explosion that will be encountered most frequently correct answers
BLEVE

the generation of overpressure is the result of exothermic reactions where in the fundamental
chemical nature of the fuel is changed correct answers chemical explosion

from the point of initiation chemical reactions of the type involved in explosions usually
propagate in a reaction __________ way correct answers front way

the most common of the chemical explosions are those caused by burning of correct answers
hydrocarbon fuels

chemical explosions can involve solid combustibles for explosive mixtures of fuel and oxidizer
but more common to the investigator will be reactions involving gas vapors or dust mixed with
air. Such combustion reactions are called ______________ reaction correct answers propagation

combustion explosions are classified as either deflagrations or detonations depending on the
velocity of the ________________ propagation through the fuel mixture correct answers flame
front

combustion reactions in which the velocity of the reaction relative to the unreacted flammables is
faster than the speed of sound correct answers detonation

an example of an electrical explosion correct answers thunder

will manifest itself as an expanding spherical heat and pressure wave front ________________
phenomenon correct answers gas dynamic

, five major groups of effects of explosion correct answers overpressure, wavet, drag loads,
projected fragment, thermal, seismic

primarily responsible for the damage and injuries associated with explosion correct answers
pressure front

for smaller cylindrical objects such as pipe support for lamp post damage is largely due to correct
answers dynamic drag

the blast pressure front occurs in two distinct phases based on the direction the forces in relation
to the point of origin of the explosion. these are correct answers positive and negative pressure
phase

the area under the pressure time curve is called the ___________ of th eexplosion correct
answers impulse

that portion of the blast pressure front in which the expanding gases are moving away from the
point of origin is the _________ pressure phase correct answers positive

responsible for the majority of pressure damage is the ___________ pressure phase correct
answers positive

can cause secondary damage and move items of physical evidence toward the point of origin -
the _____________ pressure phase correct answers negative

the negative pressure phase may be difficult to detect by witnesses or by post blast examination
in ___________ phase explosion correct answers diffuse

the most damage can be expected to be in the path of the ____________ as a result of the blast
wave expelled hot products correct answers venting

may also be reflected off solid objects and redirected resulting in a substantial increase or
possible decrease in pressure depending on the characteristics of the obstacle struck correct
answers blast pressure

after propagating reactions have consumed their available fuel the force of the expanding blast
pressure front _______________ with the increase in distance from the epicenter of the
explosion correct answers decreases

the type of damage caused by the blast person front of an explosion is dependency not onlynon
the total amount of energy generated but also and often to a larger degree on the rate of
_____________ and resulting rate of ____________ correct answers energy release / pressure
rise

low rates of pressure rise will produce _____________ order damage correct answers low-order

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