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CALC IN PLACE > Pre Test Prep > Flashcards

Pre Test Prep Flashcards

1
Q

What is the Distance Electric Blasting Caps should be kept from Energized Power lines ?

A

155 meters

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2
Q

What could cause Premature detonation of Electric blasting caps ?

A

Induced by Radio, TV signals, Lighting, Static Electricity

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3
Q

Piles of explosives Temporary stored in the open should not weigh more than how many pounds ?

And should be placed no less than how many feet apart ?

A

500 pounds

140 feet

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4
Q

Air space of not less than how many inches between the top of the stack and the cover ?

A

18 inches

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5
Q

How much are initiating charges for packed and unpacked explosives per 100 pounds ?

A

Packed : 2 pounds per 100 pounds

Unpacked: 1 pound per 100 pounds

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6
Q

Explosives stacked in a pile for destruction should not exceed how many pounds ?

A

2,000 pounds.

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7
Q

What explosive is best suited for cratering and ditching?

A

Ammonium Nitrate - because of its low RE factor

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8
Q

What actions should you take after a non electric misfire occurs ?

A

Wait 60 minutes

Untamped: Place 1 Lb. charge on undetonated charge.

Tamped less than a Foot: Place 1 Lb. charge over undetonated charge.

Tamped deeper than a foot: Dig to within a foot of undetonated charge and Place 2 Lb charge.

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9
Q

What kind of blasting caps do M-19’s have ?

A

High Det

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10
Q

What are the 3 detectable destructive effects ?

A

Deformation
Radial Cracking
Spalling

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11
Q

What is the optimum ratio of charge thickness to width ?

A

1: 3 - For steel less than 3 inches
1: 6 to 1:14 - For reinforced concrete 1 to 7 ft. thick.

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12
Q

Tamping of external charges does what ?

A

Increased effectiveness

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13
Q

The most critical factors when determining direction of fall when working with Timber is ?

A

Wind and lean

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14
Q

The minimum Length/Depth for an Timber Abatis is ?

A

75 meters.

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15
Q

What are the tree dimensions wheeled and tracked vehicles ?

A

Wheeled: 18 inches
Tracked: 24 inches

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16
Q

When placing your charges for a Timber Abatis, how high on the tree are you charges ?

A

5 feet above ground

17
Q

What are the three import factors in steel cutting ?

A

Type
Size
Placement

18
Q

How do you determine what the base of a saddle charge is ?

A

Half the circumference.

19
Q

What method of cutting does a Diamond charge use ?

A

Stress wave method.

20
Q

For external breaching charges you round breaching radius ?

For internal breaching charges you round breaching radius ?

A

Ext. Round up to the nearest half foot

Int. Round up to the nearest quarter foot.

21
Q

Opposed Counter Force charges are effective against what ?

A

Rectangular masonry or concrete columns 4 feet thick or less.

22
Q

Deliberate Crater uses a combination of what size boreholes ?

A

5 foot and 7 foot boreholes

23
Q

Relieved Face crater will have how many foot center to center spacing ?

A

7 foot.

24
Q

What is the most ideal explosive for stumping ?

A

M-1 Dynamite

25
Q

For Dead stumps how much explosive would you used per foot in diameter ?

A

1 pound

26
Q

For Live stumps how much explosive would you used per foot in diameter

A

2 pounds

27
Q

How much to you increase by for standing timber ?

How do you determine what standing timber is ?

A

Increase explosive by 50%

Anything above 18 inches is considered standing timber.

28
Q

Approximately how high above ground would you measure a stump ?

A

18 inches

29
Q

What are the three methods of Boulder removal ?

A

Snake hole method
Mudcapping
Block hole method

30
Q

Expedient Shape charges produce tubular or linear fractures known as what ?

A

Monroe Effect

31
Q

Expedient Platter Charge should weigh between ?

A

2 to 6 pounds

32
Q

How much M4 thickening compound do you use per 55 gallon fuel drum ?

A

150 ounces of M4 thickening and 50 gallons of fuel

5 gallons of fuel gets poured out to avoid overflow

33
Q

How much M112 block to you place on:

60 mm mortar:

81 mm mortar :

4.2 inch mortar:

120 mm mortar :

A

60 mm - 1/4 block of M112

81 mm -1/3 block of M112

4.2 inch- 1/2 block M112

120 mm- 1 block of M112

34
Q

Blasting caps have an RE factor of ?

A

1.60

35
Q

How do you convert Grains to pounds ?

A

Divide by 7000

36
Q

For a training environment what is the maximum PSI you can be exposed too ?

A

4 PSI

CALC IN PLACE (10 decks)

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