Army Electrical Explosives Safety (Ammo-
|\ |\ |\ |\
28) EXAM QUESTIONS WITH ANSWERS
|\ |\ |\ |\
Which two publications provide detailed information on lightning
|\ |\ |\ |\ |\ |\ |\ |\
protection systems? - CORRECT ANSWERS ✔✔DA PAM 385-64
|\ |\ |\ |\ |\ |\ |\
NFPA 780 |\
Which statements about lightning protection are true?Select all
|\ |\ |\ |\ |\ |\ |\ |\
that apply. - CORRECT ANSWERS ✔✔Lightning can detonate
|\ |\ |\ |\ |\ |\ |\ |\
munitions and explosives. |\ |\
Lightning seeks the path of least resistance to ground.
|\ |\ |\ |\ |\ |\ |\ |\
Lightning cannot be stopped or prevented.
|\ |\ |\ |\ |\
Which statement is true about a mast LPS? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Each mast must have two paths to ground.
|\ |\ |\ |\ |\ |\ |\ |\
A 30-foot tall building is protected by a catenary system. How far
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
from the building should the masts be placed? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔at least 6 feet |\ |\ |\ |\
Which LPS uses air terminals and conductors mounted directly to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the structure? - CORRECT ANSWERS ✔✔Integral
|\ |\ |\ |\ |\
, Why does the wooden mast have an air terminal on top and two
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
down conductors running its entire length? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔The wooden mast is not electrically conductive
|\ |\ |\ |\ |\ |\
Which of the following is NOT a requirement for air terminals? -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Air Terminals must be at least 6 feet tall.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
During the inspection, John's team logged a discrepancy for this
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
air terminal. Why? - CORRECT ANSWERS ✔✔The air terminal is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
not attached to a conductor.
|\ |\ |\ |\
How many down conductors are required for a building with a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
perimeter length of 325 feet? - CORRECT ANSWERS ✔✔4
|\ |\ |\ |\ |\ |\ |\ |\
While conducting an LPS inspection, you see mast down
|\ |\ |\ |\ |\ |\ |\ |\ |\
conductors routed as shown in the image below. Do you write it
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
up as a discrepancy? Why or why not? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Yes, because mast down conductors should be 180 degrees
|\ |\ |\ |\ |\ |\ |\ |\ |\
apart.
A steel beam, connected to the main LPS at its upper and lower
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
extremities, is used as a down conductor. At what intervals
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
should it be connected to the grounding system? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔60 feet or less |\ |\ |\ |\
Which statement about grounding systems is true? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔The resistance should be 25 ohms or less.
|\ |\ |\ |\ |\ |\ |\ |\
|\ |\ |\ |\
28) EXAM QUESTIONS WITH ANSWERS
|\ |\ |\ |\
Which two publications provide detailed information on lightning
|\ |\ |\ |\ |\ |\ |\ |\
protection systems? - CORRECT ANSWERS ✔✔DA PAM 385-64
|\ |\ |\ |\ |\ |\ |\
NFPA 780 |\
Which statements about lightning protection are true?Select all
|\ |\ |\ |\ |\ |\ |\ |\
that apply. - CORRECT ANSWERS ✔✔Lightning can detonate
|\ |\ |\ |\ |\ |\ |\ |\
munitions and explosives. |\ |\
Lightning seeks the path of least resistance to ground.
|\ |\ |\ |\ |\ |\ |\ |\
Lightning cannot be stopped or prevented.
|\ |\ |\ |\ |\
Which statement is true about a mast LPS? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Each mast must have two paths to ground.
|\ |\ |\ |\ |\ |\ |\ |\
A 30-foot tall building is protected by a catenary system. How far
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
from the building should the masts be placed? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔at least 6 feet |\ |\ |\ |\
Which LPS uses air terminals and conductors mounted directly to
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
the structure? - CORRECT ANSWERS ✔✔Integral
|\ |\ |\ |\ |\
, Why does the wooden mast have an air terminal on top and two
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
down conductors running its entire length? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔The wooden mast is not electrically conductive
|\ |\ |\ |\ |\ |\
Which of the following is NOT a requirement for air terminals? -
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
CORRECT ANSWERS ✔✔Air Terminals must be at least 6 feet tall.
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
During the inspection, John's team logged a discrepancy for this
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
air terminal. Why? - CORRECT ANSWERS ✔✔The air terminal is
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
not attached to a conductor.
|\ |\ |\ |\
How many down conductors are required for a building with a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
perimeter length of 325 feet? - CORRECT ANSWERS ✔✔4
|\ |\ |\ |\ |\ |\ |\ |\
While conducting an LPS inspection, you see mast down
|\ |\ |\ |\ |\ |\ |\ |\ |\
conductors routed as shown in the image below. Do you write it
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
up as a discrepancy? Why or why not? - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
✔✔Yes, because mast down conductors should be 180 degrees
|\ |\ |\ |\ |\ |\ |\ |\ |\
apart.
A steel beam, connected to the main LPS at its upper and lower
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
extremities, is used as a down conductor. At what intervals
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
should it be connected to the grounding system? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔60 feet or less |\ |\ |\ |\
Which statement about grounding systems is true? - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\
ANSWERS ✔✔The resistance should be 25 ohms or less.
|\ |\ |\ |\ |\ |\ |\ |\
