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FLETC Written Exam 2024|Questions with 100% Correct Solutions
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FLETC Written Exam 2024|Questionswith 100% Correct Solutions
Two Types of Progressive Collapse - ✅Pancaking
Cascading
Pancaking - ✅Occurs when an explosion destroys a structural member or members, causing
floor directly above destroyed members to collapse and the floor above that to collapse and so
on
Cascading - ✅Collapsing of a series of bays from the destruction of one or few bays
Fragmentation Effect - ✅When an encased explosive such as a pipe bomb detonates, the
rapidly expanding gases produced by the explosion enlarge the casing to about one and one-
half times its original diameter before it ruptures
When it ruptures, the casing breaks into fragments that are propelled away from the center
of detonation
Primary Fragmentation - ✅Has intimate contact with explosive material or is produced by
the explosive container/device
Yields incriminating forensic evidence
Secondary Fragmentation - ✅Objects propelled from around detonation point, and
fractured pieces of the intended target that become lethal missiles
Firebrand - ✅Projected hot fragmentation, burning energetic material, or burning
debris whose thermal energy is transferred to the surroundings
,IED - ✅A device placed or fabricated in a manner incorporating destructive, lethal, noxious,
pyrotechnic, or incendiary chemicals designed to kill, destroy, incapacitate, harass, or distract
It could incorporate military, commercial, or homemade explosives, or military ordnance but
is normally devised from nonmilitary components
Four Components of IEDs - ✅Power Source
Initiator
Explosive
Switch
(PIES)
Power Source - ✅Electric Initiator: battery
Mechanical Action: spring under pressure
Ignition: heat source such as flame or time fuse
Initiator - ✅Blasting caps are used to initiate high explosives
Electric caps are distinguished by two electric lead wires and needs only 1 .5 amps to function
Non-electric has a hollow recessed cavity end to accept insertion for fuse or detonation cord.
Explosives - ✅Black Powder
Pyrodex
Smokeless Powder
,Pipe Bombs
Maglite flashlights
Black Powder - ✅Most sensitive of all bulk explosives
Pyrodex - ✅Synthetic black powder
Less sensitive and less corrosive than black powder
Smokeless Powder - ✅Contains nitroglycerin and has more potential energy than
black powder
Pipe Bomb - ✅Made by filling a metal or PVC pipe with a low explosive
Three Explosive Classes of High Explosives - ✅Primary
Secondary
Tertiary or Blasting Agents
Primary Explosives - ✅Extremely susceptible to heat, mechanical shock and friction;
will respond by detonating
Secondary Explosives - ✅aka base explosives
Relatively insensitive to heat, shock, and friction to prevent unintended explosions
May burn when exposed to heat or flame
Tertiary Explosives - ✅aka Blasting Agents
, Insensitive to shock and they cannot be reliably detonated with practical quantities of
primary explosive; require an intermediate explosive booster of secondary explosive
Military High Explosives - ✅Composition C4
Semtex
PE-4A
TNT
PETN
Commercial High Explosives - ✅Dynamite
Tovex
Binary Explosive
Binary Explosive - ✅An explosive consisting of two components, ammonium nitrate and
nitromethane, neither of which is dangerous by itself, but become explosive when combined
Homemade Explosives - ✅Potassium Chlorate and Sugar Mixture
TATP
HMTD
Switches - ✅Used to arm/initiate device
Arming Switch - ✅Safety device for the bomber; works by electrically isolating the
triggering switch from the power source
3 Primary IED Methods of Initiation - ✅Timed
Victim-Operated
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