ARMY ELECTRICAL EXPLOSIVES SAFETY (AMMO28) EXAM
LATEST ACTUAL EXAM
Which four statements are characteristics of lightening? - 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? - ANSWER: All lightening
strikes the ground.
Place the steps of lightening formation in the correct order. - ANSWER: 1. Change
forms in a cloud
2. A stepped leader extends down from the cloud.
3. An upward stream extends up from the ground.
4. The stepped leader and upward streamer connect and current flows from the
cloud to the ground.
The goal of lightening protection is to - ANSWER: Provide a non-destructive, low
resistance path to the ground.
Select all the wats lightening can cause damage. - ANSWER: Spalling, Heat or fire,
Electromagnetic radiation, Current
Which three regulatory publications are used for Army explosives facilities? -
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? - ANSWER: NFPA 780, Annex A
What is the primary principle of lightening protection? - 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. - ANSWER: 1. Strike determination device
2. Down conductor
3. Grounding system
Select the LPS system(s) that require each feature. - 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? - ANSWER: Catenary system
, What is the zone of protection? - ANSWER: The area protected by a lightening
protection system (LPS)
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.
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
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
LATEST ACTUAL EXAM
Which four statements are characteristics of lightening? - 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? - ANSWER: All lightening
strikes the ground.
Place the steps of lightening formation in the correct order. - ANSWER: 1. Change
forms in a cloud
2. A stepped leader extends down from the cloud.
3. An upward stream extends up from the ground.
4. The stepped leader and upward streamer connect and current flows from the
cloud to the ground.
The goal of lightening protection is to - ANSWER: Provide a non-destructive, low
resistance path to the ground.
Select all the wats lightening can cause damage. - ANSWER: Spalling, Heat or fire,
Electromagnetic radiation, Current
Which three regulatory publications are used for Army explosives facilities? -
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? - ANSWER: NFPA 780, Annex A
What is the primary principle of lightening protection? - 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. - ANSWER: 1. Strike determination device
2. Down conductor
3. Grounding system
Select the LPS system(s) that require each feature. - 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? - ANSWER: Catenary system
, What is the zone of protection? - ANSWER: The area protected by a lightening
protection system (LPS)
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.
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
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
