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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
Q

A bomb threat search including trained personnel from all aspects of the organization is what type of search

A

Special teams

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26
Q

When wearing a bomb suit how do you approach a device

A

always forward facing

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27
Q

What is the definition of TRACEM

A

Thermal, Radiation, Asphyxiation, Chemical, Etiological and mechanical

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28
Q

What three things can we do to protect ourselves

A

Time distance and shielding

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29
Q

how can we protect ourselves from heat stress

A

Limit time in PPE, hydrate, cooling vest

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30
Q

What does a bomb suit protect us from

A

Frag, overpressure, impact, heat

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31
Q

What level of protection is a bomb suite

A

Level D

32
Q

Minimum oxygen concentration for wearing an APR

A

19.5%

33
Q

What type of respirator provides the highest level of protection

A

SCBA

34
Q

What type of ensemble provides protection from both chemical and mechanical hazards

A

Modified level B

35
Q

What is the minimum protection to be worn on a bomb incident

A

Protective vest and helmet

36
Q

Name the two atomic particles in the nucleus of an atom

A

Protons and neutrons

37
Q

What atomic particles moves in an electric circuit

A

electrons

38
Q

What is the unit of measure for resistance

A

Ohms

39
Q

If resistors are in series what does the equivalent resistance do

A

Adds

40
Q

If resistors are in parallel what does the equivalent resistance do

A

reduces

41
Q

What causes a bimetal switch to function

A

changes in temperature

42
Q

What two ways can a mousetrap fuze be sued in a device

A

electrical circuit using stricker as contact and percussion type using striker as firing pin

43
Q

What mechanical type of function is considered the most hazardous

A

anit-disturbance

44
Q

What is normally employed in a circuit containing a trembler or viboratory switch to provide an arming delay,

A

clock or timer

45
Q

What is the maximum delay using the minute hand on a clock? hour hand?

A

59 min, 11 hrs & 59 min

46
Q

What is the emergency does of RAD limit to save lives

A

25 REM

47
Q

What is the difference between high and low explosves

A

the rate of reaction

48
Q

What type of detonation does not result in the consumption of all the explosives in that charge

A

low order

49
Q

What factors affect the efficiency and functioning of a shaped charge

A

angle of the walls, liner material, stand off, type of explosive, point of initiation

50
Q

What primary explosive is usually used in percussion primers

A

lead azide

51
Q

What is the explosive train of a non electric blasting cap

A

ignition charge of lead styphnate, intermediate of lead azide, base of RDX

52
Q

Composition of C4

A

91% RDX, 9% non-explosive plasticizer and motor oil

53
Q

AN is what

A

Ammonium Nitrate (small white prills)

54
Q

ANFO is what

A

94% Ammonium nitrate and 6% fuel oil

55
Q

Deta sheet is made of what

A

A mixture of RDX and PETN

56
Q

What is DET cord made of

A

PETN, RDX or HMX

57
Q

Military dynamite is made of what

A

75% RDX, 15 % TNT, 5% cornstarch, 5% plasticizer

58
Q

Black powder is made of what

A

75% potassium or sodium nitrate, 15% charcoal, 10% sulfur

59
Q

T or F Monomolecular explosives exhibit fast detonation velocities and high detonation pressures

A

True

60
Q

What explosive is being made when citric acid is present

A

HMTD

61
Q

What over the counter sources provide nitromethane

A

Hobby shop, racing fuel, RC fuel and super glue

62
Q

What precursor can be made by distilling vapors of sulfuric acid and nitrate salts

A

Nitric acid

63
Q

What is thermite made of

A

Ferric Oxide, aluminum powder and magnesium metal

64
Q

What is a hypergolic reaction

A

chemicals that ignite wor burst into flames on contact with each other

65
Q

What explosives are very sensitive to impact, friction, sparks ect

A

primary explosives

66
Q

What explosive is made when the precursors of potassium perchlorate, aluminum powder and sulfur are mixed

A

flash powder

67
Q

What peroxide concentration is required to make HPOM

A

60-70% strength

68
Q

What are the precursors for TATP

A

hydrogen peroxide, strong acid, acetone

69
Q

What primary explosive uses hexamine as a precursor

A

HMTD

70
Q

What explosive gas is released from acid and caustic chemical reaction bombs

A

hydrogen gas

71
Q

What two components have been used in boody trapped foil metal balls and disguised as narcotics

A

50/50 potassium chlorate and red phosphorus

72
Q

HMTD is made from what

A

Hydrogen peroxide, citric acid and hexamine

73
Q

MEKP is made from what

A

Methylethylketone, hydrogen peroxide (20% strength or better) a strong acid

74
Q

PETN is made from

A

concentrated nitric acid and pentaerythitol

75
Q

RDX is made from

A

nitric acid and hexamine

HDS 2021 (24 decks)

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