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HDS 2021 > ONLINE REVIEW > Flashcards

ONLINE REVIEW Flashcards

1
Q

To say that an explosive is hygroscopic means

A

It can absorb water from its surroundings

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2
Q

Which explosive normally comes in prill form and is usually mixed with fuel oil

A

AN

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3
Q

What does a brown colored band indicate on modern US ordnance

A

Low explosive

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4
Q

C4 is made with ___ % non explosive plasticizer

A

9%

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5
Q

A minimum oxygen concentration of _____% is critical to sustain life

A

19.5 %

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6
Q

If the voltage is increased in a circuit, what will happen to the resistance and current

A

Resistances stays the same and current increases

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7
Q

What is the safest practices when managing fuels and oxidizers

A

Separate fuels and oxidizers by 25 fee horizontally

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8
Q

What is the most efficient and thorough type of search that can be performed in an office building

A

special teams

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9
Q

What is the most common metallic fuel used in IE mixtures that increases sensitivity and thermal effect

A

Aluminum powder

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10
Q

Which chemical weapon agent prevents the normal use of oxygen

A

blood

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11
Q

The bomb technician making an informed decision on how much rist to make to perform an approach or action during an IED is known as

A

risk assessment

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12
Q

What are the three most important things available to protect you from an IED

A

Time, distance and shielding

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13
Q

What are two categories of Improvised Explosives

A

Monomolecular and FOX mixtures

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14
Q

What acid might be present in the production of Improvised Explosives

A

All of the above :citric acid, hydrocholoric acid, sulfuric acid

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15
Q

What is the most destructive form of ionizing radiation to the human body if ingested or inhaled

A

Alpha

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16
Q

What do capacitors do

A

store energy

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17
Q

What are the two components required for a FOX mixture

A

Fuel and Oxidizer

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18
Q

What is one piece of equipment a bomb tech should bring downrange on every 1st approach to a suspected device

A

HRM

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19
Q

A physical block placed by the bomb tech to stop final initiating is called a

A

Positive safety

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20
Q

Which secondary explosive is the laboratory standard by which all other explosives are compared to and has the RE factor of 1

A

Trinitrotoluene TNT

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21
Q

If the blue light on your HRM starts to flash continuously what does this mean

A

It is detecting Neutron radiation

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22
Q

What should you call first if you detect radiation when performing bomb squad incidents

A

SABT

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23
Q

A bomb threat search including all building occupants is what type of search

A

Overt

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24
Q

A bomb threat search including managers is what type of search

A

Covert

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25
A bomb threat search including trained personnel from all aspects of the organization is what type of search
Special teams
26
When wearing a bomb suit how do you approach a device
always forward facing
27
What is the definition of TRACEM
Thermal, Radiation, Asphyxiation, Chemical, Etiological and mechanical
28
What three things can we do to protect ourselves
Time distance and shielding
29
how can we protect ourselves from heat stress
Limit time in PPE, hydrate, cooling vest
30
What does a bomb suit protect us from
Frag, overpressure, impact, heat
31
What level of protection is a bomb suite
Level D
32
Minimum oxygen concentration for wearing an APR
19.5%
33
What type of respirator provides the highest level of protection
SCBA
34
What type of ensemble provides protection from both chemical and mechanical hazards
Modified level B
35
What is the minimum protection to be worn on a bomb incident
Protective vest and helmet
36
Name the two atomic particles in the nucleus of an atom
Protons and neutrons
37
What atomic particles moves in an electric circuit
electrons
38
What is the unit of measure for resistance
Ohms
39
If resistors are in series what does the equivalent resistance do
Adds
40
If resistors are in parallel what does the equivalent resistance do
reduces
41
What causes a bimetal switch to function
changes in temperature
42
What two ways can a mousetrap fuze be sued in a device
electrical circuit using stricker as contact and percussion type using striker as firing pin
43
What mechanical type of function is considered the most hazardous
anit-disturbance
44
What is normally employed in a circuit containing a trembler or viboratory switch to provide an arming delay,
clock or timer
45
What is the maximum delay using the minute hand on a clock? hour hand?
59 min, 11 hrs & 59 min
46
What is the emergency does of RAD limit to save lives
25 REM
47
What is the difference between high and low explosves
the rate of reaction
48
What type of detonation does not result in the consumption of all the explosives in that charge
low order
49
What factors affect the efficiency and functioning of a shaped charge
angle of the walls, liner material, stand off, type of explosive, point of initiation
50
What primary explosive is usually used in percussion primers
lead azide
51
What is the explosive train of a non electric blasting cap
ignition charge of lead styphnate, intermediate of lead azide, base of RDX
52
Composition of C4
91% RDX, 9% non-explosive plasticizer and motor oil
53
AN is what
Ammonium Nitrate (small white prills)
54
ANFO is what
94% Ammonium nitrate and 6% fuel oil
55
Deta sheet is made of what
A mixture of RDX and PETN
56
What is DET cord made of
PETN, RDX or HMX
57
Military dynamite is made of what
75% RDX, 15 % TNT, 5% cornstarch, 5% plasticizer
58
Black powder is made of what
75% potassium or sodium nitrate, 15% charcoal, 10% sulfur
59
T or F Monomolecular explosives exhibit fast detonation velocities and high detonation pressures
True
60
What explosive is being made when citric acid is present
HMTD
61
What over the counter sources provide nitromethane
Hobby shop, racing fuel, RC fuel and super glue
62
What precursor can be made by distilling vapors of sulfuric acid and nitrate salts
Nitric acid
63
What is thermite made of
Ferric Oxide, aluminum powder and magnesium metal
64
What is a hypergolic reaction
chemicals that ignite wor burst into flames on contact with each other
65
What explosives are very sensitive to impact, friction, sparks ect
primary explosives
66
What explosive is made when the precursors of potassium perchlorate, aluminum powder and sulfur are mixed
flash powder
67
What peroxide concentration is required to make HPOM
60-70% strength
68
What are the precursors for TATP
hydrogen peroxide, strong acid, acetone
69
What primary explosive uses hexamine as a precursor
HMTD
70
What explosive gas is released from acid and caustic chemical reaction bombs
hydrogen gas
71
What two components have been used in boody trapped foil metal balls and disguised as narcotics
50/50 potassium chlorate and red phosphorus
72
HMTD is made from what
Hydrogen peroxide, citric acid and hexamine
73
MEKP is made from what
Methylethylketone, hydrogen peroxide (20% strength or better) a strong acid
74
PETN is made from
concentrated nitric acid and pentaerythitol
75
RDX is made from
nitric acid and hexamine

HDS 2021 (24 decks)

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