Download Army Electrical Explosives Safety Course (Ammo 28) Latest Exam 2025-2026 With Correct Ver and more Exams Military Strategy and Training in PDF only on Docsity!
Army Electrical Explosives Safety Course (Ammo
28) Latest Exam 2025-2026 With Correct Verified
Answers
Which four statements are characteristics of lightening? - correct answer>>Lightening heats the air to 50,000F., Most lightening never reaches the ground., Lightening carries about 30,000 amps of current., Lightening is about 1" thick. Which of the following statements about lightening is false? - correct answer>>All lightening strikes the ground. Place the steps of lightening formation in the correct order. - correct answer>>1. Change forms in a cloud
- A stepped leader extends down from the cloud.
- An upward stream extends up from the ground.
- The stepped leader and upward streamer connect and current flows from the cloud to the ground. The goal of lightening protection is to - correct answer>>Provide a non-destructive, low resistance path to the ground. Select all the wats lightening can cause damage. - correct answer>>Spalling, Heat or fire, Electromagnetic radiation, Current Which three regulatory publications are used for Army explosives facilities? - correct answer>>DESR 6055.09, DA PAM 385-64, NFPA 780 If a paragraph in NFPA 780 is labeled with an asterisk, where would you look to find additional explanatory information? - correct answer>>NFPA 780, Annex A What is the primary principle of lightening protection? - correct answer>>To protect life and property by providing a non-destructive, low resistance path to the ground Put the LPS components in the order in which the current flows after a lightening strike.
- correct answer>>1. Strike determination device
- Down conductor
- Grounding system
Which image shows an example of an integral LPS? - correct answer>>The one on the building Which image shows an example of a mast LPS? - correct answer>>The one that is just a pole Which image shows an example of a catenary LPS? - correct answer>>The one that is a pole with wires Select the LPS system(s) that require each feature. - correct answer>>Wooden or metal mast - Mast system, Catenary System Air terminals mounted to the building - Catenary System, Integral system Strike termination device on mast - Mast system, catenary system Wire connecting masts - catenary system Grounding system - mast system, catenary system, integral system Which LPS type is used to protect a large, open area? - correct answer>>Catenary system What is the zone of protection? - correct answer>>The area protected by a lightening protection system (LPS) According to the rolling sphere method, the building in the image is within the zone of protection. - correct answer>>True Match each variable to what it represents. - correct answer>>h1 - Height of mast h2 - Height of protected object R - Radius of rolling sphere d - Protected distance Using the image below, identify the value of h1. - correct answer>>85 feet Using the image below, identify the value of h2. - correct answer>>32 feet Using the image below, identify the value of R. - correct answer>>100 feet Identify h1, h2, and R in this image. - correct answer>>h1 - 40 feet h2 - 24 feet R - 100 feet
When conducting an inspection, you see the following at the bottom of an LPS mast. Do you report it? - correct answer>>Yes, because mast down conductors should be 180 degrees apart. When conducting an inspection, you see what is shown in the image. Do you report it? - correct answer>>no, because the guy wire can act as the second down conductor. How many down conductors are required for a building with a perimeter of 430 feet? - correct answer>> 5 How many conductors are required for a building with a perimeter of 210 feet? - correct answer>> 2 Which three are requirements for conductors? - correct answer>>They interconnect all air terminals., They may have only one rising path under 50 feet on a pitched roof., They may have only one rising path at less than 1/4 slope on a gently sloping roof. What is the maximum length a cross-run conductor can run without connection to the roof conductor? - correct answer>>150 feet If you were inspecting this mast, would you report a defect? - correct answer>>Yes, the down conductors are supposed to be protected. What is the preferred method of connecting conductors? - correct answer>>Exothermic weld Which two statements about bonding are true? - correct answer>>Bonding electrically connects a metal object to an LPS., Bonding reduces the risk of sideflash. Which bonding method is the most secure? - correct answer>>Welding Which condition is most common for AE facilities? - correct answer>>Condition 2a Which object is always required to be bonded? - correct answer>>A railroad track 4 feet from an LPS conductor Which condition applies to a 2-foot long grounded metal object on a 15-foot-tall structure? - correct answer>>Condition 2a
Drag the variable to what it represents. - correct answer>>D - Bonding distance h - Height of structure or proposed bond n - Value representing the number of down conductors Km - Flashover medium A grounded metal object has been added to a structure 25 feet tall. What is the bonding distance and is bonding required? - correct answer>>The bonding distance is 1 foot, and the object does not need to be bonded. A grounded metal object has been added to a structure 90 feet tall. What is the bonding distance and is bonding required? - correct answer>>The bonding distance is 3 inches, and the object does not need to be bonded. The calculated bonding distance for this object is 2 feet 6 inches. Does the window require bonding? - correct answer>>No, because A + B is greater than the bonding distance. Which two earth electrode systems are Army-approved for use in new and renovated structures? - correct answer>>Ground loop, Ground rods How do you determine the spacing requirements when using multiple ground rods? - correct answer>>Add the driven depths of both rods Which four methods can be used to connect a down conductor to a ground rod? - correct answer>>Brazing, Bolting, High Compression Crimping, Exothermic Welding What is the minimum distance between ground rods and the structure foundation? - correct answer>>3 feet How long should test records be kept? - correct answer>>6 inspection cycles How often must lightening protection systems undergo visual inspection? - correct answer>>Every 12 months How often must conductive floors undergo visual inspection? - correct answer>>Every 6 months Which of the three following are deficiencies during an LPS visual inspection? - correct answer>>Painted bond between air terminal and conductor, Broken bonding strap, Corroded conductor
Which class is associated with locations where ignitable fibers may be in the air? - correct answer>>Class III Which class is associated with locations where flammable gases or vapor may be in the air? - correct answer>>Class I Select the correct class for each item. - correct answer>>Gasoline - Class I Sawdust - Class II Acetylene - Class I Rayon Fibers - Class III Coal Dust - Class II Which division describes a hazardous classified location with a greater probability of ignition or explosion? - correct answer>>Division 1 All explosives facility hazardous locations should comply with Division 1 requirements. - correct answer>>True Which two bodies certify explosion-proof fixtures? - correct answer>>Underwriters Laboratories (UL), Factory Mutual (FM) According to the seal, this component is not approved for which two groups? - correct answer>>Group A Group E Which three of the following emit electromagnetic radiation (EMR)? - correct answer>>Radar, Handheld radio, Cellphone Which three are hazards posed by electromagnetic radiation? - correct answer>>Ignition of fuel or combustibles, Activation or disabling or electrical initiated devices (EIDs), Heat generation that can damage living organisms What are the hazards of electromagnetic radiation to ordinance (HERO)? - correct answer>>Electromagnetic radiation may initiate or disable electronically initiated devices. Select the three HERO classifications. - correct answer>>HERO Safe, HERO Susceptible, HERO unsafe
Where can you find the requirements for the minimum safe separation distance between a transmitter and ordnance? - correct answer>>DA PAM 285-64, Table 17- 4 You are dissembling an ordnance item. Its internal circuitry is exposed. What HERO category applies? - correct answer>>HERO unsafe What is the appropriate action if you see this sign while travelling along a transportation route? - correct answer>>Follow the restrictions listed. Which lightening protection system component is the initial point of contact for a lightening strike? - correct answer>>Strike termination device The required striking distance and rolling sphere radius for the zone of protection for an ammunition and explosives facility is - correct answer>>100 feet What is the maximum distance between the edge of a roof and the perimeter air terminal? - correct answer>>24 inches What is the maximum allowed distance between 24-inch air terminals in an integral system or an ammunition storage facility? - correct answer>>25 feet How far can conductors be coursed through air without support? - correct answer>> 3 feet While conducting an LPS inspection, you see down conductors like those illustrated in the image below. Do you write it up as a discrepancy? - correct answer>>Yes, because mast down conductors should be as far apart as possible. The calculated bonding distance for this object is 1 foot 6 inches. Does the window require bonding? - correct answer>>No, because A + B is greater than the bonding distance What value would you use for h when using the basic bonding formula to determine if the crane requires bonding? - correct answer>>24 feet Which statement about bonding is true? - correct answer>>Bonding reduces the threat of sideflash by providing a low resistance path to the ground. What does h represent in the basic bonding formula? - correct answer>>Height of the bond or structure
