2024 DEMOLITION EXAM ALL QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

What are the advantages and disadvantages of using demolition? - CORRECT ANSWER- Advantage: Speed, elimination of equipment, rapid and effective for cutting, burying, trenching, and tunneling Disadvantage: Requires highly trained and experienced personnel. Strict safety precautions, restricted by other nearby operations What is HERO - CORRECT ANSWER- Hazards of Electromagnetic Radiation to Ordnance Dont conduct demolition operations during what types of storms? - CORRECT ANSWER- electrical, sand, dust, snow, which produce static electrical charges or when a storm is within 10 miles What can extensive cloud coverage do to demolition operations? - CORRECT ANSWER- intensify shock effects 1000ft no go Define DODAC and NALC - CORRECT ANSWER- DODAD- department of defense identification code NALC- Navy ammunition Logistics Code and (NSN) National stock number How long must you wait after a demolition blast for poisonous gas to leave? - CORRECT ANSWER- 5 minutes What is an explosive? - CORRECT ANSWER- chemical or compound the under initiating conditions undergoes rapid chemical and physical changes generating large volumes of gas, intense heat, and high pressure What are high explosives? - CORRECT ANSWER- velocity greater than sound throughout the material exploding What are low explosives? - CORRECT ANSWER- velocity less than sound throughout the material exploding What is a high and low order detonations? - CORRECT ANSWER- High: all explosives are consumed Low: not all of the explosives are consumed Low order detonations can be caused by what? - CORRECT ANSWER- inadequate initiator or booster deterioration poor contact What is a sympathetic detonation? - CORRECT ANSWER- detonation occurring when a detonation transmits its explosive wave to another explosive causing it to detonate What is brisance? - CORRECT ANSWER- - Shattering power in the immediate vicinity of a explosion What effect does less brisance explosives have? - CORRECT ANSWER- heaving or moving effect What effect does high brisance explosives have? - CORRECT ANSWER- shattering effects required for blasting all types of rocks What is the rate of detonation? - CORRECT ANSWER- speed at which an explosive reaction progresses through the explosive What is the explosive power? - CORRECT ANSWER- effectiveness of the detonation of the explosive What is explosive strength? - CORRECT ANSWER- the energy potential of a explosive, the amount of work the material is capable of What is the explosive sensitivity? - CORRECT ANSWER- resistance of an explosive to withstand impulses such as heat, shock, and friction What is the relative effectiveness factor? - CORRECT ANSWER- the value used to compare the effectiveness of other explosives in relation to TNT (trinitrotoluene) Define hygroscopic - CORRECT ANSWER- ability for substance to absorb water from the air What are the two pressure phases? - CORRECT ANSWER- positive pressure phase negative pressure phase What are the four requirements for a shape charge? - CORRECT ANSWER- -optimum standoff -high velocity explosive -dense cone liner (made from copper, brass, lead) -free are space from base What is a spall (IRT demolition)? - CORRECT ANSWER- a flake chip, fragment. from stone or metal cause by explosive pressure wave What are the three forms of energy? - CORRECT ANSWER- air shock water shock ground motion What are the three parts of an explosive train? - CORRECT ANSWER- Initiator Booster Base Charge Detonation rate of reinforced detonation cord - CORRECT ANSWER- 21,326 feet per second The MK 19 MOD 1 detonating delay element provides how short delay interval? - CORRECT ANSWER- 52 +/- 15 milliseconds M1 military dynamite is the equivalent to what civilian dynamite and doesn't contain what? - CORRECT ANSWER- 60 percent equivalent, and contains no nitroglycerine M112 Demolition Charge C4 - CORRECT ANSWER- Consists of 1.25lbs of C-4, resistance -excellent water rating -high velocity and brisance suited for cutting steel, timber, or breaching concrete M183 charge assembly - CORRECT ANSWER- 16 M112 C4 block charges MK 75 MOD 0 tubular demolition kit - CORRECT ANSWER- good for depths up to 50 ft bangalore torpedo - CORRECT ANSWER- Explosive tube used to 3-4 yard wide path MK20 MOD 0 cable cutter - CORRECT ANSWER- good for depth up to 60 fsw - cut up to 1 in IPS -minimum lanyard length 8 ft MK3 MOD 1 cable cutter - CORRECT ANSWER- good for depth up to 150 fsw