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ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO28)
EXAM 2025–2026 Accurate Real Exam Questions
and Verified Correct Answers
Which bonding condition applies to a 65-foot metal antenna? - ANSWER-- condition 1
What does D represent in the Basic Bonding Formula? - ANSWER--bonding distance
How many inches should the tip of an air terminal be above the object or area it protects? -
ANSWER--WRONG 24
WRONG 18
Which statement regarding bonding is true? - ANSWER--Bonding reduces the threat of sideflash by providing a low impedance path to ground
How many feet radius does the DoD require for an LPS zone of protection? - ANSWER--100ft
While conducting an LPS inspection, you discover the scenario illustrated in the image below. Do you write it up as a discrepancy? - ANSWER--yes, because the air terminal is not attached to a conductor.
While conducting an LPS inspection, you see down conductors like those illustrated in the image below. Do you write it up as a discrepancy? - ANSWER-- yes, because mast down conductors should be 180 degrees apart
A 30-foot building has a metal light fixture located 23 feet from the ground. Which condition is used to determine if the light fixture must be bonded to the LPS? Refer to the bonding job aid as required. - ANSWER--condition 2a(2)
During an LPS inspection you notice a newly-installed grounded metal pipe 3 feet from a down conductor.
Should you write it up as a possible discrepancy? - ANSWER--yes. Grounded metal objects within 6 feet of a conductor should be considered for bonding
Which bonding method is used where strength and security are most critical? - ANSWER-exothermic weld
When conducting a fall-of-potential ground resistance test on a facility where ammunition and explosives are stored, what is the maximum allowable resistance reading for an LPS? - ANSWER-- ohms
While conducting an LPS inspection, you see the scene in the image below. Does this comply with LPS standards? - ANSWER--no, because the surveillance cameras are outside the zone of
protection
For best accuracy, how many individual resistance tests should be performed on this conductive floor? - ANSWER--10 tests: 5 electrode-to-electrode and 5 electrode-to-ground tests
Which test is used to verify the integrity of the LPS grounding system? - ANSWER-- fall-ofPotential Ground Resistance Test
Which test is used to verify the integrity of air terminals and down conductors? - ANSWER- continuity/Resistance Test
How many individual continuity/resistance tests are required on an integral LPS with 12 air terminals and 2 down conductors? - ANSWER--WRONG 12
24
An LPS is due a visual inspection every - ANSWER--6 months
Which action should be implemented under a lightning warning? Refer to DESR
6055.09_AFMAN 91-201, V2.E4.6 as required. - ANSWER--WRONG move all personnel outside, away from ordnance
WRONG place protective covers over EIDs and move them outside the facility
What is the minimum SSD for HERO SAFE ordnance? - ANSWER--WRONG 75 feet
Which radiation hazard category describes the danger of detonation or device failure resulting from exposing electrically initiated devices (EIDs) to EMR? - ANSWER--HERO
Which type of LPS is identified in the image below? - ANSWER--Mast
How many down conductors are required for a building with a perimeter length of 425 feet? - ANSWER-- WRONG 3
Which publication provides detailed information on Hazards of Electromagnetic Radiation to Ordnance (HERO)? - ANSWER--AFI 91-
At a minimum, how many individual resistance tests must be performed on this conductive floor? Refer to DA PAM 385-64, Section C-3 as required. - ANSWER-- Ten tests: five electrodeto-electrode and five electrode-to-ground tests
An LPS requires three-point fall-of-potential earth resistance testing every - ANSWER--Every 24
months
When conducting a 3-point fall-of-potential earth resistance test, what is the maximum allowable resistance reading? - ANSWER--25 ohms
When conducting a bonding resistance test, what is the maximum allowable reading? - ANSWER--1 ohm
How many individual bonding resistance tests are required on an integral LPS with 12 air terminals and 2 down conductors? - ANSWER--
Which storm warning system measures the strength of atmospheric electric fields and warns of the possibility of lightning strikes? - ANSWER--Pre-strike
Which hazardous classified location division poses the least probability of ignition or explosion? - ANSWER--Division 2
Which material belongs to hazardous classified location Class II? - ANSWER--coal dust
Which material belongs to hazardous classified location Class I? - ANSWER-- acetylene gas
What does Km represent in the Basic Bonding Formula? - ANSWER--WRONG Height of the proposed bond
During an LPS inspection you notice a grounded metal pipe 3 feet from a conductor. Should you write it up as a possible discrepancy? - ANSWER--Yes. Grounded metal objects within 6 feet of a conductor should be considered for bonding
What does D represent in the Basic Bonding Formula? - ANSWER--Bonding distance
Which bonding condition applies to isolated metal objects surrounded by non- conductive material (such as a metal door frame in a concrete wall)? - ANSWER-- WRONG Condition 2
Calculate the BBF to determine if bonding is required for the scenario below. Use a calculator, the BBF equation aid, and the bonding job aid as required.
- The metal vent is 15 feet high.
- There are 2 down conductors at the proper spacing.
- The vent is 12 inches (1 foot) from a conductor through air. - ANSWER--Bonding distance for the metal roof vent is 1 foot 8 inches. Bonding is required.
LPS test results must be kept on file for - ANSWER--6 inspection cycles
An LPS visual inspection is required every - ANSWER--12 months
Conductive floors in explosives facilities must be tested every - ANSWER--WRONG 6 months
Which statement regarding lightning protection is false? - ANSWER--lightning protection system prevents lightning strikes from occurring.
How many down conductors are required for a mast LPS? - ANSWER--
Which material is preferred for ground conductors? - ANSWER--Copper
What does n represent in the Basic Bonding Formula? - ANSWER--Number of down conductors
What does Km represent in the Basic Bonding Formula? - ANSWER--flashover medium
During an LPS inspection you notice a grounded metal pipe 3 feet from a conductor. Should you write it up as a possible discrepancy? - ANSWER--Yes.
Grounded metal objects within 6 feet of a conductor should be considered for bonding
What does D represent in the Basic Bonding Formula? - ANSWER--Bonding distance
When conducting a 3-point fall-of-potential earth resistance test, what is the maximum allowable resistance reading? - ANSWER--25 ohms
When conducting a bonding resistance test, what is the maximum allowable reading? - ANSWER--1 ohm
How many individual bonding resistance tests are required on an integral LPS with 12 air terminals and 2 down conductors? - ANSWER--
Which storm warning system measures the strength of atmospheric electric fields and warns of the possibility of lightning strikes? - ANSWER--Pre-strike
Which hazardous classified location division poses the least probability of ignition or explosion? - ANSWER--Division 2
Which material belongs to hazardous classified location Class II? - ANSWER--coal dust
Which material belongs to hazardous classified location Class I? - ANSWER-- acetylene gas
Which HERO classification describes items that may explode or detonate if exposed to EMR? - ANSWER-- HERO UNSAFE
Which of the following is NOT a hazard posed by electromagnetic radiation? - ANSWER--
WRONG ignition of fuel and other combustibles
WRONG generation of extreme heat in the human body
For guidance on lightning protection requirements, you use AFI 32-1065 and - ANSWER--NFPA 780
You need to inspect an LPS that has vertical poles connected to overhead cables that stretch the length of the structure. What type of LPS does this describe? - ANSWER--catenary
How many feet radius does the DoD require for an LPS zone of protection? - ANSWER--100ft
While conducting an LPS inspection, you discover the scenario illustrated in the image below. Do you write it up as a discrepancy? - ANSWER--yes, because the air terminal is not attached to a conductor.
While conducting an LPS inspection, you see down conductors like those illustrated in the image below. Do you write it up as a discrepancy? - ANSWER-- yes, because mast down conductors should be 180 degrees apart
How many inches should the tip of an air terminal be above the object or area it protects? -
ANSWER--WRONG 24
WRONG 18
Which test is used to verify the integrity of the LPS grounding system? - ANSWER-- fall-ofPotential Ground Resistance Test
Which test is used to verify the integrity of air terminals and down conductors? - ANSWER- continuity/Resistance Test
How many individual continuity/resistance tests are required on an integral LPS with 12 air terminals and 2 down conductors? - ANSWER--WRONG 12
24
When performing a conductive floor test, what is the minimum distance required between test electrodes and grounded metal objects? - ANSWER--WRONG 6 feet
According to the identification plate below, the component is certified for Group C and - ANSWER-- WRONG group B
Which bonding condition applies to isolated metal objects surrounded by non- conductive material (i.e., a metal door frame in a brick wall)? - ANSWER--WRONG Condition 1
Which statement regarding bonding is true? - ANSWER--Bonding reduces the threat of sideflash by providing a low impedance path to ground
While conducting a continuity/resistance test on the integral LPS below, test leads are placed on ground rod S and air terminal N. In addition to bonds A, J, and M, which bond is being tested? - ANSWER-- WRONG H
When conducting a continuity/resistance test on a conductor less than 65 feet long, the maximum allowable reading is - ANSWER--WRONG 5 ohms
WRONG 25 ohms
When conducting a fall-of-potential ground resistance test on a facility measuring 130 feet diagonally, how far from the ground rod should the P2 test probe be placed? - ANSWER--65 feet
This conductive floor was tested at 5 locations. All electrode-to-electrode resistance readings were between 48,000 ohms and 80,000 ohms. Did this particular test pass? Refer to AFI 321065, Section A6. as required. - ANSWER-- yes, because any resistance reading above 25,000 ohms is acceptable.
An LPS is due a visual inspection every - ANSWER--6 months
Which action should be implemented under a lightning warning? Refer to DESR
6055.09_AFMAN 91-201, V2.E4.6 as required. - ANSWER--WRONG move all personnel outside, away from ordnance
WRONG place protective covers over EIDs and move them outside the facility
What is the minimum SSD for HERO SAFE ordnance? - ANSWER--WRONG 75 feet
Which radiation hazard category describes the danger of detonation or device failure resulting from exposing electrically initiated devices (EIDs) to EMR? - ANSWER--HERO
Which type of LPS is identified in the image below? - ANSWER--Mast
How many down conductors are required for a building with a perimeter length of 325 feet? - ANSWER-- 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?
- ANSWER--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? - ANSWER--60 feet or less
Which statement about grounding systems is true? - ANSWER--The resistance should be 25 ohms or less.
Which of the following statements regarding bonding are true? Select all that apply. - ANSWER-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? - ANSWER-- When it's within 6 feet of a conductor
Which bonding method is the most permanent and secure? - ANSWER-- Exothermic weld
Which factors are used to calculate bonding distance?Select all that apply. - ANSWER--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? - ANSWER--Because grounded metal objects within 6 feet of LPS conductors should be bonded to it
Which types of information does an LPS record provide? Select all that apply. - ANSWER--Test locations
Test item descriptions or listing
Type of test
Responsibilities for conducting and administering the test plan
Which section of DA PAM 385-64 provides LPS visual inspection guidance? - ANSWER-Appendix D
How often is a visual inspection required on an LPS? - ANSWER--Every 12 months While conducting the LPS inspection, the team saw these surveillance cameras.
Does this building comply with LPS standards? - ANSWER--No, because the surveillance cameras are outside the zone of protection.
How long must LPS test results be kept on file? - ANSWER--6 inspection cycles
How often is a conductive floor electrical test required in an ESD-sensitive operating facility? - ANSWER-- Every 6 months
For best accuracy, how many individual resistance tests are recommended for a conductive floor?
Refer to DA PAM 385-64, Section C-3 as required. - ANSWER--Ten test: Five electrode-toelectrode tests and five electrode-to-ground tests
This conductive floor was tested at five locations. The average resistance of the electrode-toelectrode test was 55,871 ohms. Does this test pass? Refer to DA PAM 385-64, Section C-3. - ANSWER--Yes, because an average resistance of 55,871 ohms is within standards
How often is a 3-point fall-of-potential earth resistance test required on an LPS? - ANSWER-Every 24 months
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.
Alerts when lightning is nearby
Pre-strike - ANSWER--Measure the strength of atmospheric electric fields
Alerts when lightning strikes are imminent
What is the primary danger in a hazardous classified location? - ANSWER-- Explosive atmosphere
Which division describes a hazardous classified location with greatest probability of ignition or explosion? - ANSWER--Division 1
Which two agencies tests and certify explosion-proof electrical equipment? - ANSWER--Army Ordnance Safety and Security Activity (AOSSA)
Factory Mutual (FM)
Underwriter's Laboratory (UL)
Which device does NOT emit electromagnetic radiation? - ANSWER--Calculator
Which three are hazards posed by electromagnetic radiation? - ANSWER--
Generation of extreme heat in the human body
ignition of fuel and other combustibles
Activation or disabling of electrically initiated devices (EIDs)
Which two precautions should you take when approaching EMR-vunerable ordnance with a hand-held radio? - ANSWER--Enclose the ordnance completely in a sealed, all-metal container Turn off the radio when within 10 feet of ordnance
While conducting an LPS inspection, you discover the scenario illustrated in the image below. Do you write it up as a discrepancy? Why or why not? - ANSWER-- Yes, because the air terminal is not attached to a conductor.
How many down conductors are required for a building with a perimeter length of 425 feet? - ANSWER-- 5
Which material is preferred for ground conductors? - ANSWER--copper
What does h represent in the Basic Bonding Formula? - ANSWER--Height of the proposed bond
What does n represent in the Basic Bonding Formula? - ANSWER--Number of down conductors
Calculate the BBF to determine if bonding is required for the scenario below. Use a calculator, the BBF equation aid, and the bonding job aid as required.
- The metal vent is 15 feet high.
- There are 2 down conductors at the proper spacing.
- The vent is 12 inches (1 foot) from a conductor through air. - ANSWER--Bonding distance for the metal roof vent is 1 foot 8 inches. Bonding is required.
A 30-foot building has a metal light fixture located 23 feet from the ground. Which condition is used to determine if the light fixture must be bonded to the LPS? Refer to the bonding job aid as required. - ANSWER--Condition 2a (2)
Which test is used to verify the integrity of the LPS grounding system? - ANSWER-- 3-Point Fallof- Potential Earth Resistance Test
Which LPS test is used to verify the integrity of air terminals and down conductors? - ANSWER-Bonding Resistance Test
When conducting a bonding resistance test, what is the maximum allowable reading? - ANSWER--1 ohm
What is the primary danger of a hazardous classified location? - ANSWER-- Airborne substances that can ignite
Which material belongs to hazardous classified location Class I? - ANSWER-- Acetylene gas Which radiation hazard category describes the danger of detonation or device failure resulting from exposing electrically initiated devices (EIDs) to EMR? - ANSWER--HERO
Which HERO classification describes items that may explode or detonate if exposed to EMR? - ANSWER-- HERO unsafe
