Pre Test Prep Flashcards
What is the Distance Electric Blasting Caps should be kept from Energized Power lines ?
155 meters
What could cause Premature detonation of Electric blasting caps ?
Induced by Radio, TV signals, Lighting, Static Electricity
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 ?
500 pounds
140 feet
Air space of not less than how many inches between the top of the stack and the cover ?
18 inches
How much are initiating charges for packed and unpacked explosives per 100 pounds ?
Packed : 2 pounds per 100 pounds
Unpacked: 1 pound per 100 pounds
Explosives stacked in a pile for destruction should not exceed how many pounds ?
2,000 pounds.
What explosive is best suited for cratering and ditching?
Ammonium Nitrate - because of its low RE factor
What actions should you take after a non electric misfire occurs ?
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.
What kind of blasting caps do M-19’s have ?
High Det
What are the 3 detectable destructive effects ?
Deformation
Radial Cracking
Spalling
What is the optimum ratio of charge thickness to width ?
1: 3 - For steel less than 3 inches
1: 6 to 1:14 - For reinforced concrete 1 to 7 ft. thick.
Tamping of external charges does what ?
Increased effectiveness
The most critical factors when determining direction of fall when working with Timber is ?
Wind and lean
The minimum Length/Depth for an Timber Abatis is ?
75 meters.
What are the tree dimensions wheeled and tracked vehicles ?
Wheeled: 18 inches
Tracked: 24 inches
When placing your charges for a Timber Abatis, how high on the tree are you charges ?
5 feet above ground
What are the three import factors in steel cutting ?
Type
Size
Placement
How do you determine what the base of a saddle charge is ?
Half the circumference.
What method of cutting does a Diamond charge use ?
Stress wave method.
For external breaching charges you round breaching radius ?
For internal breaching charges you round breaching radius ?
Ext. Round up to the nearest half foot
Int. Round up to the nearest quarter foot.
Opposed Counter Force charges are effective against what ?
Rectangular masonry or concrete columns 4 feet thick or less.
Deliberate Crater uses a combination of what size boreholes ?
5 foot and 7 foot boreholes
Relieved Face crater will have how many foot center to center spacing ?
7 foot.
What is the most ideal explosive for stumping ?
M-1 Dynamite
For Dead stumps how much explosive would you used per foot in diameter ?
1 pound
For Live stumps how much explosive would you used per foot in diameter
2 pounds
How much to you increase by for standing timber ?
How do you determine what standing timber is ?
Increase explosive by 50%
Anything above 18 inches is considered standing timber.
Approximately how high above ground would you measure a stump ?
18 inches
What are the three methods of Boulder removal ?
Snake hole method
Mudcapping
Block hole method
Expedient Shape charges produce tubular or linear fractures known as what ?
Monroe Effect
Expedient Platter Charge should weigh between ?
2 to 6 pounds
How much M4 thickening compound do you use per 55 gallon fuel drum ?
150 ounces of M4 thickening and 50 gallons of fuel
5 gallons of fuel gets poured out to avoid overflow
How much M112 block to you place on:
60 mm mortar:
81 mm mortar :
4.2 inch mortar:
120 mm mortar :
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
Blasting caps have an RE factor of ?
1.60
How do you convert Grains to pounds ?
Divide by 7000
For a training environment what is the maximum PSI you can be exposed too ?
4 PSI
