Army Electrical Explosive Safety Test Questions with Verified Answers Latest Update 2025 Graded A+
Which four statements are characteristics of lightning? - Answers 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? - Answers All lightning strikes the ground.
Place the steps of lightning formation in the correct order. - Answers 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 - Answers Provide a non-destructive, low resistance path to ground.
Select all the ways lightning can cause damage. - Answers 1. Spalling
2. Heat or fire
3. Electromagnetic radiation
4. Current
Which three regulatory publications are used for Army explosives facilities? - Answers 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? - Answers NFPA 780, Annex A
What is primary principle of lightning protection? - Answers 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. - Answers 1.
Strike Termination Device
2. Down Conductor
3. Grounding System
Select the LPS system(s) that require each feature. - Answers 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? - Answers Catenary system
What is the zone of protection? - Answers 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. -
Answers True
Zone of Protection Variables - Answers 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. - Answers 85 feet
Using the image below, identify the value of h2. - Answers 32 feet
Using the image below, identify the value of R. - Answers 100 feet
Identify h1, h2, and R in the this image. - Answers h1= 10 feet
h2= 24 feet
R= 100 feet
Which four statements are characteristics of lightning? - Answers 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? - Answers All lightning strikes the ground.
Place the steps of lightning formation in the correct order. - Answers 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 - Answers Provide a non-destructive, low resistance path to ground.
Select all the ways lightning can cause damage. - Answers 1. Spalling
2. Heat or fire
3. Electromagnetic radiation
4. Current
Which three regulatory publications are used for Army explosives facilities? - Answers 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? - Answers NFPA 780, Annex A
What is primary principle of lightning protection? - Answers 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. - Answers 1.
Strike Termination Device
2. Down Conductor
3. Grounding System
Select the LPS system(s) that require each feature. - Answers 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? - Answers Catenary system
What is the zone of protection? - Answers 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. -
Answers True
Zone of Protection Variables - Answers 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. - Answers 85 feet
Using the image below, identify the value of h2. - Answers 32 feet
Using the image below, identify the value of R. - Answers 100 feet
Identify h1, h2, and R in the this image. - Answers h1= 10 feet
h2= 24 feet
R= 100 feet
