Exam 6-Explosives Flashcards
(126 cards)
What type of explosives are defined as unstable substances or mixtures of substances capable of undergoing sudden and violent decomposition or break up.
Chemical explosives
Any chemical compound, mixture, or device, the common primary or common purpose of which is to function by explosion is defined by 18 USC chapter ——-, as what.
18USC Chapter 40
Explosives
Explosives characterized by deflagration, the development of low pressure, slow chemical reaction, subsonic explosion, and no shock wave.
Low explosives (LE)
Low explosives are typically classified as pyrotechnics and propellants.
Black powder & smokeless powder
Explosives characterized by a very high rate of reaction, high pressure development, and detonation, during which the explosive is decomposed into hot, rapidly expanding gas resulting in a supersonic explosion.
High explosives
Chemicals that can detonate.
_______________ is directly related to the functioning velocity of an explosive.
Explosive work or explosive power.
True/False
Low explosives detonate.
False
What type of explosive demonstrates pushing or heaving power?
Low explosive
High explosives have the ability to shatter OR push depending on their detonation velocity. Think of the two vehicles. The white vehicle suffered greater catastrophic damage bc the velocities were slower.
What term refers to the shattering or crushing effect of a sudden release of energy from an explosive; ability of explosives when detonated to shatter, rip apart, or tear its surroundings?
Brisance.
A ___________ is an ordered combination of explosives necessary to achieve an explosion.
Explosive train
What is the first step in the explosive train?
Initiation
Definition: first step in the explosive process. It starts the reaction that leads to the explosion.
What is defined as a sudden and violent escape of gases from a central point accompanied by high temperature, violent shock, and loud noise and either involve detonation or rapid deflagration?
Explosion
Combustion may be devised into what three broad categories?
A. Slow, rapid, and instantaneous combustion
B. low, high, and simultaneous combustion
C. Complete, incomplete, and bilateral combustion.
D. Taco Bell, Krystal’s, McDonalds Big Mac.
A. Slow combustion
Rapid combustion
Instantaneous combustion.
What type of combustion is merely normal burning, the heating of a substance as it reaches it’s ignition point?
Slow combustion
Rapid combustion is referred to as an explosion if it is
A. Controlled
B. Confined
C. Oxidized
D. Violent
Answer: B confined
Rapid combustion is referred to as explosion if confined. Like fuel and air mixture being ignited by a spark plug inside the cylinder of a gasoline engine, resulting in an explosion.
True/False
Instantaneous combustion is called detonation.
True
It is the instantaneous conversion of the explosive substance from a solid or liquid to a gas.
\_\_\_\_\_\_\_\_ is the very rapid exothermic (burning), self-propagating chemical reaction thru un reacted material at a velocity less than speed of sound (3300 FPS) A. Rapid combustion B. Detonation C. Deflagration D. Initiation
C. Deflagration
A Chemical reaction given by an explosive substance which produces a shock wave, creates high temps, and pressure gradients and where the chemical reaction is initiated instantaneously is \_\_\_\_\_\_\_ A. Detonation B. High explosive C. Rapid Combustion D. Deflagration
A. Detonation
Speed at which the shock wave passes thru a column of explosives is referred to as what?
Detonation velocity.
Remember the difference in the damage to the cars between dynamite and ANFO
The incomplete consumption or the complete consumption, but at lower than optimum velocity, of an explosive is referred to as... A. High order detonation B. Sympathetic detonation C. Low order detonation D. Slow combustion
C. Low order detonation
Causes: deterioration of explosive, poor contact between initiator and the explosive, disruption of the shock wave (air bubbles in explosive), insufficient power of initiator.
True/False
High order detonation is the complete consumption of the explosive at its optimum (highest) velocity.
True
Low order is the incomplete consumption or the complete consumption but at less than optimum velocity.
The initiation of an explosive from the shock wave of another explosive charge that is in close proximity is referred to as \_\_\_\_\_\_\_\_\_\_\_ detonation. A. Instantaneous combustion B. Sympathetic detonation C. Detonation velocity D. Deflagration.
B. Sympathetic detonation
The three types of explosions are…
A. low order, high order, and sympathetic.
B. Slow, rapid, instantaneous
C. Mechanical, chemical, nuclear
D. Deflagration, detonation, and deterioration.
C. Mechanical, Chemical, Nuclear
Mechanical-simple mech. pressure w/o explosive chemical reaction
Chemical-rapid conversion of substance (solid/liquid) into gas.
Nuclear-Fission. Splitting nucleons of atoms.
An explosion involving the conversion of a substance (such as water) into a gas, without any explosive chemical reaction (hint), is referred to as what type of explosion?
Hint- B.L.E.V.E
Mechanical explosion.
B.L.E.V.E- Boiling liquid, expanding vapor, explosion
Example: hot water heater.
A type of explosion where by a solid or liquid substance is rapidly transformed/converted into a gas is referred to as a ___________ explosion.
Chemical.
These materials (small in bulk) are transformed into large volumes of hot gases in a fraction of a second.
Chemical explosions contain their own FUELS and OXIDIZERS.