FLETC WRITTEN EXAM 60 EXAM SCRIPT 2026
TESTED QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
◉ High Explosive. Answer: Explosive which normally requires a
blasting cap for initiation and once initiated produces a supersonic
detonation with a shattering or brisant effect
Detonate without confinement, doesn't need container
◉ Low Explosive. Answer: Explosive, which when unconfined,
responds to initiation by deflagration or burning and produces a
pushing effect
Transitions from deflagration to detonation when confined
◉ Incendiary Explosive. Answer: Explosive designed to start fires or
destroy sensitive equipment
◉ Detonation. Answer: Supersonic combustion that propagates
through shock compression generating exothermic heat and an
accompanying blast wave
,◉ Deflagration. Answer: A subsonic combustion that propagates
through thermal conductivity
◉ Effects of an Explosion. Answer: Thermal
Blast Pressure
Fragmentation
◉ Thermal Effect. Answer: Usually seen as a bright flash or fireball
at the moment of detonation
May cause localized ignition of highly combustible materials
Generally least damaging of the three effects
◉ Blast Pressure Effect. Answer: Very hot gasses (between 3,000
and 7,000 degrees Fahrenheit) expand out from the point of
detonation at supersonic velocities (up to 20,000 mph)
The further the pressure wave travels, the less power it has
Most powerful and destructive/deadly of the effects
,When taking place in a confined area, it can amplify the original
blast wave
◉ Two Phases of Blast Pressure. Answer: Positive Phase
Negative Phase
◉ Positive Phase of Blast Pressure. Answer: Pressure wave moving
outward from the point of detonation
◉ Negative Phase of Blast Pressure. Answer: Partial vacuum is
created near the epicenter due to the outward movement of air and
the consumption of oxygen from the combustion process
◉ 4 Types of Injuries Sustained During a Blast. Answer: Primary
Blast Injury
Secondary Blast Injury
Tertiary Blast Injury
Quaternary Injury
◉ Primary Blast Injury. Answer: Caused by direct effects of blast
◉ Secondary Blast Injury. Answer: Caused by propelled
fragmentation (most deadly)
, ◉ Tertiary Blast Injury. Answer: Occurs when a casualty's body is
propelled by the blast against the ground or stationary objects
◉ Quaternary Injury. Answer: Any other injuries (burns and crush
injuries)
◉ Three Mechanisms of Primary Blast Injury. Answer: Implosion
Spalling
Inertial Effects
◉ Implosion. Answer: Occurs when blast impacts the human body
by compressing air-filled cavities in the body and causes tissue
damage as compressed air stretches, tears, and ruptures internal
organs and tissues
◉ Spalling. Answer: Describes tissue injury caused when blast wave
rapidly changes velocity as it moves through tissues of different
densities
◉ Blast Lung. Answer: Severe form of pulmonary contusion, crushed
lung tissue fills with blood and cannot exhange oxygen
TESTED QUESTIONS AND CORRECT ANSWERS
ALREADY PASSED
◉ High Explosive. Answer: Explosive which normally requires a
blasting cap for initiation and once initiated produces a supersonic
detonation with a shattering or brisant effect
Detonate without confinement, doesn't need container
◉ Low Explosive. Answer: Explosive, which when unconfined,
responds to initiation by deflagration or burning and produces a
pushing effect
Transitions from deflagration to detonation when confined
◉ Incendiary Explosive. Answer: Explosive designed to start fires or
destroy sensitive equipment
◉ Detonation. Answer: Supersonic combustion that propagates
through shock compression generating exothermic heat and an
accompanying blast wave
,◉ Deflagration. Answer: A subsonic combustion that propagates
through thermal conductivity
◉ Effects of an Explosion. Answer: Thermal
Blast Pressure
Fragmentation
◉ Thermal Effect. Answer: Usually seen as a bright flash or fireball
at the moment of detonation
May cause localized ignition of highly combustible materials
Generally least damaging of the three effects
◉ Blast Pressure Effect. Answer: Very hot gasses (between 3,000
and 7,000 degrees Fahrenheit) expand out from the point of
detonation at supersonic velocities (up to 20,000 mph)
The further the pressure wave travels, the less power it has
Most powerful and destructive/deadly of the effects
,When taking place in a confined area, it can amplify the original
blast wave
◉ Two Phases of Blast Pressure. Answer: Positive Phase
Negative Phase
◉ Positive Phase of Blast Pressure. Answer: Pressure wave moving
outward from the point of detonation
◉ Negative Phase of Blast Pressure. Answer: Partial vacuum is
created near the epicenter due to the outward movement of air and
the consumption of oxygen from the combustion process
◉ 4 Types of Injuries Sustained During a Blast. Answer: Primary
Blast Injury
Secondary Blast Injury
Tertiary Blast Injury
Quaternary Injury
◉ Primary Blast Injury. Answer: Caused by direct effects of blast
◉ Secondary Blast Injury. Answer: Caused by propelled
fragmentation (most deadly)
, ◉ Tertiary Blast Injury. Answer: Occurs when a casualty's body is
propelled by the blast against the ground or stationary objects
◉ Quaternary Injury. Answer: Any other injuries (burns and crush
injuries)
◉ Three Mechanisms of Primary Blast Injury. Answer: Implosion
Spalling
Inertial Effects
◉ Implosion. Answer: Occurs when blast impacts the human body
by compressing air-filled cavities in the body and causes tissue
damage as compressed air stretches, tears, and ruptures internal
organs and tissues
◉ Spalling. Answer: Describes tissue injury caused when blast wave
rapidly changes velocity as it moves through tissues of different
densities
◉ Blast Lung. Answer: Severe form of pulmonary contusion, crushed
lung tissue fills with blood and cannot exhange oxygen
