ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO-
28) PRACTICE TEST QUESTIONS AND CORRECT
ANSWERS/ AMMO 28 PRACTICE TEST 2025 (NEW)
Which three of the following are requirements for air terminals? - ANSWER-Air
terminals must have two paths to ground., Air terminals must be within 24 inches
of the edge of the building or end of a ridge., Air terminals must be 10 inches
above the object they are protecting.
Which two earth electrode systems are Army-approved for use in new and
renovated structures? - ANSWER-Ground loop, Ground rods
During an inspection you see a metal vent outside the zone of protection. The
vent's walls are 1/8 inch thick. Does it require an air terminal? - ANSWER-Yes,
because vents less than 3/16 inch thick require an air terminal.
What principle is used to determine placements for air terminals? - ANSWER-100-
foot radius rolling sphere
According to DA PAM 385-64, what is the minimum height for air terminals on
ammunition facilities with integral systems? - ANSWER-24 inches
During an inspection, you find an air terminal that is 30 inches high. At what point
does it need to be supported? - ANSWER-15 inches or higher
Drag and drop the name and description to the correct conductor. - ANSWER-
Cross-Run Conductor: Connects additional strike termination device - runs across
building
Roof Conductor: Runs along perimeter of flat roof or ridge of pitched roof
pg. 1
,Down Conductor: Required for all LPS; connects to the grounding system
Which of the following statements about conductors is true? - ANSWER-All LPS
require at least two down conductors.
For Class I structures, what is the minimum size of each strand of main conductor
copper wire? - ANSWER-17 AWG
When conducting an inspection, you see the following at the bottom of an LPS
mast. Do you report it? - 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? - 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? - ANSWER-5
How many conductors are required for a building with a perimeter of 210 feet? -
ANSWER-2
Which three are requirements for conductors? - 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? - ANSWER-150 feet
pg. 2
, If you were inspecting this mast, would you report a defect? - ANSWER-Yes, the
down conductors are supposed to be protected.
What is the preferred method of connecting conductors? - ANSWER-Exothermic
weld
Which two statements about bonding are true? - ANSWER-Bonding electrically
connects a metal object to an LPS., Bonding reduces the risk of sideflash.
Which bonding method is the most secure? - ANSWER-Welding
Which condition is most common for AE facilities? - ANSWER-Condition 2a
Which object is always required to be bonded? - 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? - ANSWER-Condition 2a
Drag the variable to what it represents. - 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? - ANSWER-The bonding distance is 1
foot, and the object does not need to be bonded.
pg. 3
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