ARMY ELECTRICAL EXPLOSIVES SAFETY
(AMMO28) PRACTICE TEST QUESTIONS AND
CORRECT ANSWERS/ AMMO 28 PRACTICE TEST
2025 (NEW
Which four statements are characteristics of lightning? - ANSWER 1. Lightning
heats the air to 50,000F.
2. Most lightning never reaches the ground.
3. Lightning carries about 30,000 amps of current.
4. Lightning is about 1'' thick.
Which of the following statements about lightning is false? - ANSWER All lightning
strikes the ground.
Place the steps of lightning formation in the correct order. - ANSWER 1. Charge
form in a cloud.
2. A stepped leader extends down from the cloud.
3. An upward streamer 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 lightning protection is to - ANSWER Provide a non-destructive, low
resistance path to ground.
Select all the ways lightning can cause damage. - ANSWER 1. Spalling
2. Heat or fire
3. Electromagnetic radiation
4. Current
Which three regulatory publications are used for Army explosives facilities? -
ANSWER 1. DESR 6055.09
2. DA PAM 385-64
3. 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 primary principle of lightning protection? - ANSWER To protect life and
property by providing a non-destructive, low resistance path to ground.
Put the LPS components in the order in which the current flows after a lightning
strike. - ANSWER 1. Strike Termination Device
2. Down Conductor
3. Grounding System
, Select the LPS system(s) that require each feature. - ANSWER Mast System
1. Wooden or metal mast
2. Strike termination device on mast
3. Grounding system
Catenary System
1. Wooden or metal mast
2. Strike termination device on mast
3. Wire connecting masts
4. Grounding system
Integral System
1. Air terminals mounted to the building.
2. Grounding system
Which LPS type us used to protect a large, open area? - ANSWER Catenary
system
What is the zone of protection? - ANSWER The area protected by a lighting
protection system.
According to the rolling sphere method, the building in the image is within the zone of
protection. - ANSWER True
Zone of Protection Variables - ANSWER D= Protected distance
H1= Height of the mast
R2= Radius of the rolling sphere
H2= Heigh of the object being protected
Using the image below, identify the value of h1. - ANSWER 85 feet
Using the image below, identify the value of h2. - ANSWER 32 feet
Using the image below, identify the value of R. - ANSWER 100 feet
Identify h1, h2, and R in the this image. - ANSWER h1= 10 feet
h2= 24 feet
R= 100 feet
Use the zone of protection formula to find the protected distance (d) for this
structure. - ANSWER 15 feet
Identify h1, h2, and R in this image. - ANSWER h1= 40 feet
h2= 10 feet
R= 100 feet
Is the trailer within the building's zone of protection? Use the zone o protection
formula and the variables you identified in the previous question to calculate. -
ANSWER No, because the protected distance is less than the measured distance.
Which three of the following are requirements for air terminals? - ANSWER 1. Air
terminals must be 10 inches above the object they are protecting.
(AMMO28) PRACTICE TEST QUESTIONS AND
CORRECT ANSWERS/ AMMO 28 PRACTICE TEST
2025 (NEW
Which four statements are characteristics of lightning? - ANSWER 1. Lightning
heats the air to 50,000F.
2. Most lightning never reaches the ground.
3. Lightning carries about 30,000 amps of current.
4. Lightning is about 1'' thick.
Which of the following statements about lightning is false? - ANSWER All lightning
strikes the ground.
Place the steps of lightning formation in the correct order. - ANSWER 1. Charge
form in a cloud.
2. A stepped leader extends down from the cloud.
3. An upward streamer 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 lightning protection is to - ANSWER Provide a non-destructive, low
resistance path to ground.
Select all the ways lightning can cause damage. - ANSWER 1. Spalling
2. Heat or fire
3. Electromagnetic radiation
4. Current
Which three regulatory publications are used for Army explosives facilities? -
ANSWER 1. DESR 6055.09
2. DA PAM 385-64
3. 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 primary principle of lightning protection? - ANSWER To protect life and
property by providing a non-destructive, low resistance path to ground.
Put the LPS components in the order in which the current flows after a lightning
strike. - ANSWER 1. Strike Termination Device
2. Down Conductor
3. Grounding System
, Select the LPS system(s) that require each feature. - ANSWER Mast System
1. Wooden or metal mast
2. Strike termination device on mast
3. Grounding system
Catenary System
1. Wooden or metal mast
2. Strike termination device on mast
3. Wire connecting masts
4. Grounding system
Integral System
1. Air terminals mounted to the building.
2. Grounding system
Which LPS type us used to protect a large, open area? - ANSWER Catenary
system
What is the zone of protection? - ANSWER The area protected by a lighting
protection system.
According to the rolling sphere method, the building in the image is within the zone of
protection. - ANSWER True
Zone of Protection Variables - ANSWER D= Protected distance
H1= Height of the mast
R2= Radius of the rolling sphere
H2= Heigh of the object being protected
Using the image below, identify the value of h1. - ANSWER 85 feet
Using the image below, identify the value of h2. - ANSWER 32 feet
Using the image below, identify the value of R. - ANSWER 100 feet
Identify h1, h2, and R in the this image. - ANSWER h1= 10 feet
h2= 24 feet
R= 100 feet
Use the zone of protection formula to find the protected distance (d) for this
structure. - ANSWER 15 feet
Identify h1, h2, and R in this image. - ANSWER h1= 40 feet
h2= 10 feet
R= 100 feet
Is the trailer within the building's zone of protection? Use the zone o protection
formula and the variables you identified in the previous question to calculate. -
ANSWER No, because the protected distance is less than the measured distance.
Which three of the following are requirements for air terminals? - ANSWER 1. Air
terminals must be 10 inches above the object they are protecting.
