Demo Procedures

Question 1

How many holes are necessary for a lacing technique?

Answer 1

4 with a 6 inch tail

Question 2

How many wraps for a hasty whip (minimum)?

Answer 2

4

Question 3

How are blasting machines rated?

Answer 3

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

Question 4

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

Answer 4

Square knot or modified girth hitch

Question 5

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

Answer 5

Double overhand or Uli knot

Question 6

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

Answer 6

Square knot

Question 7

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

Answer 7

Lace or hasty whip

Question 8

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

Answer 8

False

Question 9

What would you use a galvometer for?

Answer 9

Check firing wire and electric blasting caps for continuity

Question 10

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

Answer 10

False. No metal to metal to cut explosives.

Question 11

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

Answer 11

Modified girth hitch

Question 12

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

Answer 12

Check circuit for continuity

Question 13

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

Answer 13

Minimum 3 twists

Question 14

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?

Answer 14

18 inches

Question 15

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

Answer 15

Prime the explosive with two electric caps in parallel

Question 16

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

Answer 16

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

Question 17

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

Answer 17

6 inches

Question 18

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

Answer 18

60 minutes plus burn time

Question 19

What are some disadvantages of non-electric procedures?

Answer 19

Wait time and no control over shot

Question 20

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

Answer 20

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

Question 21

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

Answer 21

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

Question 22

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

Answer 22

1/8 inch to 1/4 inch

Question 23

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

Answer 23

Ring main and main line

Question 24

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?

Answer 24

90 degrees

Question 25

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

Answer 25

Tie a knot on the non-working end.

Question 26

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

Answer 26

False

Question 27

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

Answer 27

Galvanometer

Question 28

The M81fuse igniter can be used to initiate what?

Answer 28

Safety fuse of shock tube

Question 29

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?

Answer 29

30 minutes

Question 30

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

Answer 30

False

Question 31

What is the difference between civilian and military blasting caps?

Answer 31

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

Question 32

Why are copper blasting caps dangerous?

Answer 32

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

Question 33

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

Answer 33

Of the same type and manufacturer

Question 34

How many places should you weigh down time fuse?

Answer 34

In 2 places to avoid it curling up on itself

Question 35

What is sensitized Det cord considered?

Answer 35

A booster, not an initiating cap

Question 36

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

Answer 36

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

Question 37

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

Answer 37

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

Question 38

What is the misfire wait time for an electrical misfire?

Answer 38

30 minutes