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ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO-28) QUESTIONS AND ANSWERS 2025, Exams of Advanced Education

ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO-28) QUESTIONS AND ANSWERS 2025

Typology: Exams

2024/2025

Available from 12/24/2024

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ARMY ELECTRICAL EXPLOSIVES SAFETY
(AMMO-28) QUESTIONS AND ANSWERS
2025
Which two publications provide detailed information on lightning protection systems? - DA PAM 385-64
NFPA 780
Which statements about lightning protection are true?Select all that apply. - Lightning can detonate
munitions and explosives.
Lightning seeks the path of least resistance to ground.
Lightning cannot be stopped or prevented.
Which statement is true about a mast LPS? - Each mast must have two paths to ground.
A 30-foot tall building is protected by a catenary system. How far from the building should the masts be
placed? - at least 6 feet
Which LPS uses air terminals and conductors mounted directly to the structure? - Integral
Why does the wooden mast have an air terminal on top and two down conductors running its entire
length? - The wooden mast is not electrically conductive
Which of the following is NOT a requirement for air terminals? - Air Terminals must be at least 6 feet
tall.
During the inspection, John's team logged a discrepancy for this air terminal. Why? - The air terminal is
not attached to a conductor.
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ARMY ELECTRICAL EXPLOSIVES SAFETY

(AMMO-28) QUESTIONS AND ANSWERS

Which two publications provide detailed information on lightning protection systems? - DA PAM 385- NFPA 780 Which statements about lightning protection are true?Select all that apply. - Lightning can detonate munitions and explosives. Lightning seeks the path of least resistance to ground. Lightning cannot be stopped or prevented. Which statement is true about a mast LPS? - Each mast must have two paths to ground. A 30-foot tall building is protected by a catenary system. How far from the building should the masts be placed? - at least 6 feet Which LPS uses air terminals and conductors mounted directly to the structure? - Integral Why does the wooden mast have an air terminal on top and two down conductors running its entire length? - The wooden mast is not electrically conductive Which of the following is NOT a requirement for air terminals? - Air Terminals must be at least 6 feet tall. During the inspection, John's team logged a discrepancy for this air terminal. Why? - The air terminal is not attached to a conductor.

How many down conductors are required for a building with a perimeter length of 325 feet? - 4 While conducting an LPS inspection, you see mast down conductors routed as shown in the image below. Do you write it up as a discrepancy? Why or why not? - Yes, because mast down conductors should be 180 degrees apart. A steel beam, connected to the main LPS at its upper and lower extremities, is used as a down conductor. At what intervals should it be connected to the grounding system? - 60 feet or less Which statement about grounding systems is true? - The resistance should be 25 ohms or less. Which of the following statements regarding bonding are true? Select all that apply. - Bonding reduces the threat of sideflash by providing a low impedance path to ground. Bonding is a way of connecting LPS conductors to grounded metal objects. When should a grounded metal object be considered for bonding? - When it's within 6 feet of a conductor Which bonding method is the most permanent and secure? - Exothermic weld Which factors are used to calculate bonding distance?Select all that apply. - Height of proposed bond Flashover medium Number of down conductors While conducting the inspection, John's team noticed a new metal light pole installed 3 feet from the down conductor at the corner of this building. They logged a discrepancy. Why? - Because grounded metal objects within 6 feet of LPS conductors should be bonded to it

When conducting a 3-point fall-of-potential earth resistance test on an integral LPS, how far from the ground rod should you place the C2 and P2 test probes? Refer to DA PAM 385-64, Table B-1 as required. Select one response for the C2 probe distance and one response for the P2 probe distance. - C2 probe at 131 feet P2 probe at 82 feet What is the maximum allowable resistance reading for a 3-point fall-of-potential earth resistance test? - 25 ohms or less How often is a bonding resistance test required on an LPS? - Every 24 months What is the maximum allowable reading for a bonding resistance test on an LPS conductor? - 1 ohm or less When conducting a bonding resistance test on an integral LPS with 10 air terminals and two down conductors, how many individual resistance tests are required, at a minimum? - 20 While conducting a bonding resistance test on the integral LPS below, you placed test leads on ground rod S and air terminal N. Which three bonds listed below are NOT being tested? - B H P What information should be in a destructive weather plan? Select all that apply. - Which operations to shut down Who is responsible for shutting down each operation Steps for shutting down each operation

Instructions for evacuating personnel Instructions for restarting each operation Spheric - Detects lightning strike Alerts when lightning is nearby Pre-strike - Measure the strength of atmospheric electric fields Alerts when lightning strikes are imminent What is the primary danger in a hazardous classified location? - Explosive atmosphere Which division describes a hazardous classified location with greatest probability of ignition or explosion? - Division 1 Which two agencies tests and certify explosion-proof electrical equipment? - Army Ordnance Safety and Security Activity (AOSSA) Factory Mutual (FM) Underwriter's Laboratory (UL) Which device does NOT emit electromagnetic radiation? - Calculator Which three are hazards posed by electromagnetic radiation? - Generation of extreme heat in the human body ignition of fuel and other combustibles

Which test is used to verify the integrity of the LPS grounding system? - 3-Point Fall-of-Potential Earth Resistance Test Which LPS test is used to verify the integrity of air terminals and down conductors? - Bonding Resistance Test When conducting a bonding resistance test, what is the maximum allowable reading? - 1 ohm What is the primary danger of a hazardous classified location? - Airborne substances that can ignite Which material belongs to hazardous classified location Class I? - Acetylene gas Which radiation hazard category describes the danger of detonation or device failure resulting from exposing electrically initiated devices (EIDs) to EMR? - HERO Which HERO classification describes items that may explode or detonate if exposed to EMR? - HERO unsafe