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HDS > Demo Procedures > Flashcards

Demo Procedures Flashcards

1
Q

How many holes are necessary for a lacing technique?

A

4 with a 6 inch tail

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2
Q

How many wraps for a hasty whip (minimum)?

A

4

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3
Q

How are blasting machines rated?

A

Rated in number of caps in series the machine will reliably detonate?

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4
Q

Which knots could you use to attach two pieces of Det cord together?

A

Square knot or modified girth hitch

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5
Q

Which knot would you use to initiate C-4 with unsensitized Det cord?

A

Double overhand or Uli knot

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6
Q

Which knot would you use to tie two pieces of Det cord together to form a longer length?

A

Square knot

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7
Q

Which knot could you use to attach Det cord to dynamite?

A

Lace or hasty whip

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8
Q

T or F. An electrical firing system consists of an electric Blasting cap, firing wire, Galvo, and a M81 igniter?

A

False

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9
Q

What would you use a galvometer for?

A

Check firing wire and electric blasting caps for continuity

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10
Q

T or F. A crisper should be used to cut Det cord?

A

False. No metal to metal to cut explosives.

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11
Q

What knot would you use to attach a branch line to either a ring main or main line?

A

Modified girth hitch

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12
Q

After connecting two caps in series circuit, what step must be done next?

A

Check circuit for continuity

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13
Q

How many twists of an electrical blasting cap leg wires will provide a proper shunt?

A

Minimum 3 twists

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14
Q

When connecting two pieces of Det cord together with tape, what is the minimum length of surface area will the Det cord contact with each other?

A

18 inches

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15
Q

To properly electrically dual prime an explosive, the bomb tech will have to?

A

Prime the explosive with two electric caps in parallel

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16
Q

What is the purpose of performing the close-open-close test on the firing wire after it is laid out?

A

To ensure that there are not shorts or breaks in the wire

17
Q

When lacing explosives, what is the minimum length of the pigtails?

A

6 inches

18
Q

What is the wait time for a non-electric misfire?

A

60 minutes plus burn time

19
Q

What are some disadvantages of non-electric procedures?

A

Wait time and no control over shot

20
Q

What are preventative measures that can be taken to prevent a non-electric misfire?

A

No moisture in caps, dual system, secure caps, correct procedures, don’t bury caps and corrective procedures

21
Q

What factors determine the safe separation time (SST) for a demo operation?

A

The time needed for a person to walk at a normal pace from the demo site back to the safe area before the explosion occurs

22
Q

When crimping a non-eclectic cap onto time fuze, what is the appropriate distance to crimp from the open end of the cap?

A

1/8 inch to 1/4 inch

23
Q

What’s are the two types of det cord systems?

A

Ring main and main line

24
Q

When attaching a branch line to a main line, what is the minimum angle of the branch line from the direction of the detonating wave?

A

90 degrees

25
Q

What is the first thing you do to a new roll of time fuse before conducting a test burn?

A

Tie a knot on the non-working end.

26
Q

T or F: A non-electric firing system consists of crimpers, electric blasting cap, M81 igniter and safety fuse

A

False

27
Q

What item of equipment would you use to check the continuity of an electrical firing system?

A

Galvanometer

28
Q

The M81fuse igniter can be used to initiate what?

A

Safety fuse of shock tube

29
Q

What is the minimum wait time prior to investigating a misfire involving a Primadet if the shock tube initiated to the cap, but the cap did not go off?

A

30 minutes

30
Q

T or F: You can use a multimeter to test blasting caps

A

False

31
Q

What is the difference between civilian and military blasting caps?

A

Military caps are more powerful and less sensitive. Civilian caps are more sensitive but less powerful

32
Q

Why are copper blasting caps dangerous?

A

They date back to pre-WWII and usually develop dangerous explosive salts

33
Q

If two or more caps are combined, what must they be?

A

Of the same type and manufacturer

34
Q

How many places should you weigh down time fuse?

A

In 2 places to avoid it curling up on itself

35
Q

What is sensitized Det cord considered?

A

A booster, not an initiating cap

36
Q

What are the advantages and disadvantages of a non-electric time fuse firing system?

A

Advantages: Minimum equipment, not subject to premature detonation. Disadvantages: No control after initiation, 60 min wait plus burn time for a misfire

37
Q

What are the advantages and disadvantages of a non-electric Primadet system?

A

Advantages: Minimum equipment, positive control, no premature detonation. Disadvantages: Have to collect expended tube, 30 minute wait time for misfire

38
Q

What is the misfire wait time for an electrical misfire?

A

30 minutes

HDS (23 decks)

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