ARMY ELECTRICAL EXPLOSIVE SAFETY
Module 1-4 Exam Questions and Answers 100%
Accurate
Which four statements are characteristics of lightning? - ANSWER-+Lightning heats the
air to 50,000 degrees F
+Most lightning never reaches the ground
+lightning carries about 30,000 amps current
+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 forms in
a cloud
2. a stepped leader extends down from the cloud
3. and upward streamer extends 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-spalling
heat or fire
electromagnetic radiation
current
(all are correct)
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 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-+strike termination device
, +down conductor
+grounding system
which image shows an example of an integral LPS? - ANSWER-The middle one with
the building
which image shows an example of a mast LPS? - ANSWER-The first one the lone
ranger
which image shows and example of a catenary LPS? - ANSWER-the last one The guy
with all his friends
select the LPS system(s) that require each feature - ANSWER-+Mast system : wooden
or metal mast, strike termination device on mast, grounding system
+Catenary system: wooden or metal mast, strike termination device on mast, wire
connecting masts, grounding system
+Integral system; air terminals mounted to the building, grounding 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 lightning protection
system
According to the rolling sphere method, the building in the image is within the zone of
protection. - ANSWER-true
match each variable to what it represents - ANSWER-+h1: height of mast
+h2: height of protected object
+R: radius of rolling sphere
+d: protected distance
Using the image below, identify the value of h1 ( blue 100ft, green 85ft, purple 25.5ft,
and red 32ft) - ANSWER-85 feet
Using the image below, identify the value of h2 ( blue 100ft, green 85ft, purple 25.5ft,
and red 32ft) - ANSWER-32 feet
Using the image below, identify the value of R ( blue 100ft, green 85ft, purple 25.5ft, and
red 32ft) - ANSWER-100 feet
Identify h1, h2, and R in this image ( green 40ft, red 24ft, and purple ?ft) - ANSWER-h1:
40ft
Module 1-4 Exam Questions and Answers 100%
Accurate
Which four statements are characteristics of lightning? - ANSWER-+Lightning heats the
air to 50,000 degrees F
+Most lightning never reaches the ground
+lightning carries about 30,000 amps current
+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 forms in
a cloud
2. a stepped leader extends down from the cloud
3. and upward streamer extends 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-spalling
heat or fire
electromagnetic radiation
current
(all are correct)
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 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-+strike termination device
, +down conductor
+grounding system
which image shows an example of an integral LPS? - ANSWER-The middle one with
the building
which image shows an example of a mast LPS? - ANSWER-The first one the lone
ranger
which image shows and example of a catenary LPS? - ANSWER-the last one The guy
with all his friends
select the LPS system(s) that require each feature - ANSWER-+Mast system : wooden
or metal mast, strike termination device on mast, grounding system
+Catenary system: wooden or metal mast, strike termination device on mast, wire
connecting masts, grounding system
+Integral system; air terminals mounted to the building, grounding 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 lightning protection
system
According to the rolling sphere method, the building in the image is within the zone of
protection. - ANSWER-true
match each variable to what it represents - ANSWER-+h1: height of mast
+h2: height of protected object
+R: radius of rolling sphere
+d: protected distance
Using the image below, identify the value of h1 ( blue 100ft, green 85ft, purple 25.5ft,
and red 32ft) - ANSWER-85 feet
Using the image below, identify the value of h2 ( blue 100ft, green 85ft, purple 25.5ft,
and red 32ft) - ANSWER-32 feet
Using the image below, identify the value of R ( blue 100ft, green 85ft, purple 25.5ft, and
red 32ft) - ANSWER-100 feet
Identify h1, h2, and R in this image ( green 40ft, red 24ft, and purple ?ft) - ANSWER-h1:
40ft
