Army Electrical Explosives Safety Course
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(Ammo 28) QUESTIONS WITH ANSWERS |\ |\ |\ |\
Which four statements are characteristics of lightening? -
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CORRECT ANSWERS ✔✔Lightening heats the air to 50,000F., Most
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lightening never reaches the ground., Lightening carries about
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30,000 amps of current., Lightening is about 1" thick.
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Which of the following statements about lightening is false? -
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CORRECT ANSWERS ✔✔All lightening strikes the ground.
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Place the steps of lightening formation in the correct order. -
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CORRECT ANSWERS ✔✔1. Change forms in a cloud
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2. A stepped leader extends down from the cloud.
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3. An upward stream extends up from the ground.
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4. The stepped leader and upward streamer connect and current
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flows from the cloud to the ground.
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The goal of lightening protection is to - CORRECT ANSWERS
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✔✔Provide a non-destructive, low resistance path to the ground.
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Select all the wats lightening can cause damage. - CORRECT
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ANSWERS ✔✔Spalling, Heat or fire, Electromagnetic radiation,
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Current
,Which three regulatory publications are used for Army explosives
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facilities? - CORRECT ANSWERS ✔✔DESR 6055.09, DA PAM 385-
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64, NFPA 780 |\ |\
If a paragraph in NFPA 780 is labeled with an asterisk, where
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would you look to find additional explanatory information? -
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CORRECT ANSWERS ✔✔NFPA 780, Annex A |\ |\ |\ |\ |\
What is the primary principle of lightening protection? - CORRECT
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ANSWERS ✔✔To protect life and property by providing a non-
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destructive, low resistance path to the ground |\ |\ |\ |\ |\ |\
Put the LPS components in the order in which the current flows
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after a lightening strike. - CORRECT ANSWERS ✔✔1. Strike
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determination device |\
2. Down conductor
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3. Grounding system
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Which image shows an example of an integral LPS? - CORRECT
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ANSWERS ✔✔The one on the building |\ |\ |\ |\ |\
Which image shows an example of a mast LPS? - CORRECT
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ANSWERS ✔✔The one that is just a pole |\ |\ |\ |\ |\ |\ |\
Which image shows an example of a catenary LPS? - CORRECT
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ANSWERS ✔✔The one that is a pole with wires |\ |\ |\ |\ |\ |\ |\ |\
, Select the LPS system(s) that require each feature. - CORRECT
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ANSWERS ✔✔Wooden or metal mast - Mast system, Catenary
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System
Air terminals mounted to the building - Catenary System, Integral
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system
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Strike termination device on mast - Mast system, catenary
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system
Wire connecting masts - catenary system
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Grounding system - mast system, catenary system, integral|\ |\ |\ |\ |\ |\ |\ |\
system
Which LPS type is used to protect a large, open area? - CORRECT
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ANSWERS ✔✔Catenary system |\ |\
What is the zone of protection? - CORRECT ANSWERS ✔✔The
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area protected by a lightening protection system (LPS)
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According to the rolling sphere method, the building in the image
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is within the zone of protection. - CORRECT ANSWERS ✔✔True
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Match each variable to what it represents. - CORRECT ANSWERS
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✔✔h1 - Height of mast |\ |\ |\ |\
h2 - Height of protected object
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R - Radius of rolling sphere
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d - Protected distance
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(Ammo 28) QUESTIONS WITH ANSWERS |\ |\ |\ |\
Which four statements are characteristics of lightening? -
|\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔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? -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔All lightening strikes the ground.
|\ |\ |\ |\ |\ |\
Place the steps of lightening formation in the correct order. -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔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 - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Provide a non-destructive, low resistance path to the ground.
|\ |\ |\ |\ |\ |\ |\ |\
Select all the wats lightening can cause damage. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Spalling, Heat or fire, Electromagnetic radiation,
|\ |\ |\ |\ |\ |\ |\
Current
,Which three regulatory publications are used for Army explosives
|\ |\ |\ |\ |\ |\ |\ |\ |\
facilities? - CORRECT ANSWERS ✔✔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? -
|\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔NFPA 780, Annex A |\ |\ |\ |\ |\
What is the primary principle of lightening protection? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔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. - CORRECT ANSWERS ✔✔1. Strike
|\ |\ |\ |\ |\ |\ |\ |\ |\
determination device |\
2. Down conductor
|\ |\
3. Grounding system
|\ |\
Which image shows an example of an integral LPS? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔The one on the building |\ |\ |\ |\ |\
Which image shows an example of a mast LPS? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔The one that is just a pole |\ |\ |\ |\ |\ |\ |\
Which image shows an example of a catenary LPS? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔The one that is a pole with wires |\ |\ |\ |\ |\ |\ |\ |\
, Select the LPS system(s) that require each feature. - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔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? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔Catenary system |\ |\
What is the zone of protection? - CORRECT ANSWERS ✔✔The
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
area protected by a lightening protection system (LPS)
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According to the rolling sphere method, the building in the image
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
is within the zone of protection. - CORRECT ANSWERS ✔✔True
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Match each variable to what it represents. - CORRECT ANSWERS
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✔✔h1 - Height of mast |\ |\ |\ |\
h2 - Height of protected object
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R - Radius of rolling sphere
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d - Protected distance
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