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ARMY ELECTRICAL EXPLOSIVES SAFETY
(AMMO28) EXAM 2024-2025 q
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
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
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 electrode-to-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
How many inches should the tip of an air terminal be above the object or area it protects? - ANSWER>>WRONG 24 WRONG 18
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 bonding condition applies to a 65-foot metal antenna? - ANSWER>>condition 1
What does D represent in the Basic Bonding Formula? - ANSWER>>bonding distance
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>>25 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-of-Potential 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
