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...
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
Which image shows an example of an integral LPS? - ANSWER-The one on the
building
Which image shows an example of a mast LPS? - ANSWER-The one that is just a pole
, Which image shows an example of a catenary LPS? - ANSWER-The one that is a pole
with wires
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)
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. - 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 this image. - ANSWER-h1 - 40 feet
h2 - 24 feet
R - 100 feet
Use the zone of protection formula to find the 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 of 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-Air
terminals must have two paths to ground., Air terminals must be within 24 inches of the
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