Air Diving and Decompression
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Total Number of Questions
15
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Questions
Multiple Choice, 10 points, 1 attempt(s) permitted.
1. What is the best choice of words when discussing dive tables and why?
Correct
X
Choice
Feedback
Safe; because dive tables are based on proven
physiological models reflecting how the human
body absorbs and eliminates nitrogen.
Dive tables are better described as reliable,
“safe” implies no risk of DSC. THERE IS ALWAYS
A RISK OF DCS, even when diving well within
table limits.
Reliable; because even though all dive tables
are based on hypothetical decompression
models, reliable tables provide acceptable risk.
Correct
Best guess; because there is no theoretical
basis for dive tables.
Dive tables are better described as reliable, all
dive tables are teoritical.
Individually specific; because modern
decompression models allow the user to
account for all of the factors influencing
decompression risk.
Dive tables are better described as reliable,
while there are theories on the cause of DCS
no one really knows the cause.
Multiple Choice, 10 points, 1 attempt(s) permitted.
2. US Navy and NOAA Dive Tables define a single dive as:
Correct
X
Choice
Feedback
any dive made more than 12 hours following a
previous dive.
Correct
any dive made less than 12 hours after
surfacing from a prior dive.
Us Navy and NOAA Dive Tables define a single
dive as any dive made in a 12 hour period.
any dive made more than 24 hours following a
previous dive.
Us Navy and NOAA Dive Tables define a single
dive as any dive made in a 12 hour period.
any dive made less than 24 hours after
surfacing from a prior dive.
Us Navy and NOAA Dive Tables define a single
dive as any dive made in a 12 hour period.
Multiple Choice, 10 points, 1 attempt(s) permitted.
3. Us Navy and NOAA Dive Tables define a _____ dive as any dive made less than 12 hours after
surfacing from a prior dive.
Correct
X
Choice
Feedback
single
Incorrect, a repetitive dive is any dive made
less than 12 hours after surfacing from a prior
dive.
repetitive
Correct
decompression
Incorrect, a repetitive dive is any dive made
less than 12 hours after surfacing from a prior
dive.
contingency
Incorrect, a repetitive dive is any dive made
less than 12 hours after surfacing from a prior
dive.
True/False, 10 points, 1 attempt(s) permitted.
4. Even though this presentation does not address required decompression dive procedures in
detail, divers using US Navy or NOAA Dive Tables are expected to know how to calculate
required decompression schedules for contingency planning purposes.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
Multiple Choice, 10 points, 1 attempt(s) permitted.
5. What is the significance of a Group Designation Letter with US Navy or NOAA Dive Tables?
Correct
X
Choice
Feedback
It represents the amount of nitrogen a diver
absorbs during a dive to a given depth for a
given period of time.
Correct
It represents the amount of nitrogen a diver
off-gases during a dive.
Incorrect, a Group Designation Letter
represents the amount of nitrogen a diver
absorbs during a dive to a given depth for a
given period of time.
It represents the no-decompression limit for a
given depth for a given period of time.
Incorrect, a Group Designation Letter
represents the amount of nitrogen a diver
absorbs during a dive to a given depth for a
given period of time.
It represents the amount of nitrogen a diver
absorbs during a no-decompression dive. Once
a diver reaches the no-decompression limit the
diver becomes saturated with nitrogen and
Group Designation Letters are no longer used.
Incorrect, a Group Designation Letter
represents the amount of nitrogen a diver
absorbs during a dive to a given depth for a
given period of time.
Multiple Choice, 10 points, 1 attempt(s) permitted.
6. Using US Navy or NOAA Air Dive Tables, a dive to 70 feet (22m) for 31 minutes results in a
Group Designation Letter of:
Correct
X
Choice
Feedback
F
Incorrect, 70' for 31 minutes results in a Group
Designation Letter G.
G
Correst
H
Incorrect, 70' for 31 minutes results in a Group
Designation Letter G.
I
Incorrect, 70' for 31 minutes results in a Group
Designation Letter G.
Multiple Choice, 10 points, 1 attempt(s) permitted.
7. Using US Navy or NOAA Air Dive Tables, a dive to 71 feet for 15 minutes followed by a one
hour surface interval will result in a Group Designation Letter of:
Correct
X
Choice
Feedback
B
Incorrect, a dive to 71 feet for 15 minutes
followed by a one hour surface interval will
result in a Group Designation Letter of D.
C
Incorrect, a dive to 71 feet for 15 minutes
followed by a one hour surface interval will
result in a Group Designation Letter of D.
D
Correct
E
Incorrect, a dive to 71 feet for 15 minutes
followed by a one hour surface interval will
result in a Group Designation Letter of D.
Multiple Choice, 10 points, 1 attempt(s) permitted.
8. Using US Navy or NOAA Air Dive Tables, a dive to 55 feet for 40 minutes followed by a 90
minute surface interval and a repetitive dive to 63 feet for 20 minutes will result in a Group
Designation Letter of:
Correct
X
Choice
Feedback
G
Incorrect, a dive to 55 feet for 40 minutes
followed by a 90 minute surface interval and a
repetitive dive to 63 feet for 20 minutes will
result in a Group Designation Letter of J.
H
Incorrect, a dive to 55 feet for 40 minutes
followed by a 90 minute surface interval and a
repetitive dive to 63 feet for 20 minutes will
result in a Group Designation Letter of J.
J
Correct
K
Incorrect, a dive to 55 feet for 40 minutes
followed by a 90 minute surface interval and a
repetitive dive to 63 feet for 20 minutes will
result in a Group Designation Letter of J.
Multiple Choice, 10 points, 1 attempt(s) permitted.
9. A diver using US Navy or NOAA Air Dive Tables plans a dive to 100' for 25 minutes. The diver
should calculate contingency dive plans accounting for exceeding both depth and time. Exceeding
the planned depth by as little as a foot results in a five plan of:
Correct
X
Choice
Feedback
110' for 25 minutes, requires a decompression
stop at 10' for 3 minutes.
Correct
100' for 40 minutes, requires a decompression
stop at 15' for 10 minutes.
Incorrect, exceeding the planned depth by as
little as a foot results in a five plan of 110' for
25 minutes, requires a decompression stop at
10' for 3 minutes.
110' for 30 minutes, requires a decompression
Incorrect, exceeding the planned depth by as
stop at 10' for 7 minutes.
little as a foot results in a five plan of 110' for
25 minutes, requires a decompression stop at
10' for 3 minutes.
100' for 25 minutes requires no decompression
stop.
Incorrect, exceeding the planned depth by as
little as a foot results in a five plan of 110' for
25 minutes, requires a decompression stop at
10' for 3 minutes.
Multiple Choice, 10 points, 1 attempt(s) permitted.
10. Using US Navy or NOAA Air Dive Tables, determine the residual nitrogen time (RNT) for a
diver with a Group Designation Letter of G wanting to make a repetitive five to 60'.
Correct
X
Choice
Feedback
16
Incorrect, the RNT for a diver with a Group
Designation Letter of G wanting to make a
repetitive five to 60' is 44 minutes.
56
Incorrect, the RNT for a diver with a Group
Designation Letter of G wanting to make a
repetitive five to 60' is 44 minutes.
37
Incorrect, the RNT for a diver with a Group
Designation Letter of G wanting to make a
repetitive five to 60' is 44 minutes.
44
Correct
Multiple Choice, 10 points, 1 attempt(s) permitted.
11. Using US Navy or NOAA Air Dive Tables determine the adjusted maximum dive time for a
repetitive dive with no decompression for a diver with a Group Designation Letter of D wanting to
make a repetitive dive to 50'.
Correct
X
Choice
Feedback
29
Incorrect, the adjusted maximum dive time for
a repetitive dive with no decompression for a
diver with a Group Designation Letter of D
wanting to make a repetitive dive to 50' is 79
minutes.
79
Correct
17
Incorrect, the adjusted maximum dive time for
a repetitive dive with no decompression for a
diver with a Group Designation Letter of D
wanting to make a repetitive dive to 50' is 79
minutes.
43
Incorrect, the adjusted maximum dive time for
a repetitive dive with no decompression for a
diver with a Group Designation Letter of D
wanting to make a repetitive dive to 50' is 79
minutes.
Multiple Choice, 10 points, 1 attempt(s) permitted.
12. ______ stops are recommended while ______ stops are required by the dive tables.
Correct
X
Choice
Feedback
Decompression / safety
Incorrect, safety stops are recommended while
decompression stops are required by the dive
tables.
Safety / omitted
Incorrect, safety stops are recommended while
decompression stops are required by the dive
tables.
Safety / decompression
Correct
Precautionary / scheduled
Incorrect, safety stops are recommended while
decompression stops are required by the dive
tables.
Multiple Choice, 10 points, 1 attempt(s) permitted.
13. A diver realizes he has exceeded his planned dive schedule and does not have contingency
tables. The diver can:
Correct
X
Choice
Feedback
Ascend at a proper rate and stop at 10 to 15
fsw for a minimum of 15 minutes or until
cylinder pressure reaches 300 psi. If the time
spent at 10 to 15 ' did not equal or exceed the
required decompression time, the diver should
be placed on oxygen for a minimum of 30
minutes, observed, and restricted from diving
for 12 hours.
All three outlined options are correct.
Surface and, if asymptomatic, return to the
water within five minutes to the depth of the
missed decompression and remain for one and
one-half times the required stop time.
All three outlined options are correct.
Surface and breath oxygen for a minimum of
60 minutes.
All three outlined options are correct.
All of the above.
Correct
None of the above.
Incorrect, all three outlined options are
correct.
True/False, 10 points, 1 attempt(s) permitted.
14. Unlike Dive Tables, Dive Computers calculate a dive profile in "real time"; compute
"multilevel dives"; and have automatic dive log functions.
Correct
X
Choice
True
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect
True/False, 10 points, 1 attempt(s) permitted.
15. Unlike Dive Tables, Dive Computers and PC Based Decompression Software offer a method of
calculating decompression obligation with zero risk of DCS.
Correct
Choice
True
X
False
Feedback when correct: Correct
Feedback when incorrect: Incorrect