NAUI Instructor Exam UPDATED
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Henry's Law - CORRECT ANSWER The amount of gas dissolved in a liquid is
directly related to its partial pressure above the liquid.
Relationship of gas solubility and temperature - CORRECT ANSWER Solubility of
gas decreases with increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue - CORRECT ANSWER Body tissue absorbs
more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables - CORRECT ANSWER Gives the
diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule - CORRECT ANSWER Use the next greater dive
TIME to determine letter group
Equilibrium as it relates to nitrogen in the body - CORRECT ANSWER When the
pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio - CORRECT ANSWER Originally 2:1 - Updated with new
research to 1.58:1
Tissue compartment half-time - CORRECT ANSWER The time required for the
compartment to absorb or eliminate half of the pressure difference between what it started
with and the ambient pressure
,M-Value of tissue - CORRECT ANSWER The maximum allowable nitrogen (inert
gas) pressure in a specific tissue
NAUI recommendation for diving while pregnant - CORRECT ANSWER Do not dive
while pregnant
Haldane tissue compartments - CORRECT ANSWER Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment - CORRECT ANSWER Mathematical model consisting of
multiple theoretical tissues and their relative halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude - CORRECT ANSWER Slower than at sea level
Extend dive times with gas by - CORRECT ANSWER Decreased nitrogen and
increased oxygen in breathing gas
RNT - CORRECT ANSWER Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops - CORRECT ANSWER Remain out of the
water, rest, breathe 100% oxygen, drink fluids, be monitored for signs of decompression
illness, transported to a hyperbaric facility if symptoms arise
SIT - CORRECT ANSWER Surface Interval Time
Longer time at the surface allows for increased repeat dive times
, Canadian Dive Tables published by the Defense and Civil Institute of Environmental
Medicine (DCIEM) - CORRECT ANSWER Based on 20+ years of research pioneered
by Kidd and Stubbs (1962)
Swiss Dive Tables - CORRECT ANSWER Developed by A.A. Bühlmann at the
University of Zurich - EXTENDED TO INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your Total Dive
Time to exceed the Dive Time Limits, you should: - CORRECT ANSWER Use the
Maximum Dive Time as your Total Dive Time
Aching pains an hour after a dive might be: - CORRECT ANSWER Decompression
sickness
ATA rating for most hyperbaric chambers for treating divers: - CORRECT ANSWER 6
ATA
Haldane Tissue Half-Times (Compartments) - CORRECT ANSWER 5, 10, 20, 40, 75
Mins
High altitude dive - CORRECT ANSWER Any dive at greater than 1000 feet
Ideal hyperbaric chamber for dive injury - CORRECT ANSWER Multiplace, double-
lock chamber rated for service to six atmospheres
Repetitive Dive - CORRECT ANSWER Any dive started within 24 hours after a
previous dive
NAUI recommended minimum SIT time - CORRECT ANSWER 60 mins
Dives shallower than 40 ft are considered how deep on NAUI Dive Tables - CORRECT
ANSWER 40 ft
ACTUAL QUESTIONS AND CORRECT
ANSWERS
Henry's Law - CORRECT ANSWER The amount of gas dissolved in a liquid is
directly related to its partial pressure above the liquid.
Relationship of gas solubility and temperature - CORRECT ANSWER Solubility of
gas decreases with increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue - CORRECT ANSWER Body tissue absorbs
more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables - CORRECT ANSWER Gives the
diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule - CORRECT ANSWER Use the next greater dive
TIME to determine letter group
Equilibrium as it relates to nitrogen in the body - CORRECT ANSWER When the
pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio - CORRECT ANSWER Originally 2:1 - Updated with new
research to 1.58:1
Tissue compartment half-time - CORRECT ANSWER The time required for the
compartment to absorb or eliminate half of the pressure difference between what it started
with and the ambient pressure
,M-Value of tissue - CORRECT ANSWER The maximum allowable nitrogen (inert
gas) pressure in a specific tissue
NAUI recommendation for diving while pregnant - CORRECT ANSWER Do not dive
while pregnant
Haldane tissue compartments - CORRECT ANSWER Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment - CORRECT ANSWER Mathematical model consisting of
multiple theoretical tissues and their relative halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude - CORRECT ANSWER Slower than at sea level
Extend dive times with gas by - CORRECT ANSWER Decreased nitrogen and
increased oxygen in breathing gas
RNT - CORRECT ANSWER Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops - CORRECT ANSWER Remain out of the
water, rest, breathe 100% oxygen, drink fluids, be monitored for signs of decompression
illness, transported to a hyperbaric facility if symptoms arise
SIT - CORRECT ANSWER Surface Interval Time
Longer time at the surface allows for increased repeat dive times
, Canadian Dive Tables published by the Defense and Civil Institute of Environmental
Medicine (DCIEM) - CORRECT ANSWER Based on 20+ years of research pioneered
by Kidd and Stubbs (1962)
Swiss Dive Tables - CORRECT ANSWER Developed by A.A. Bühlmann at the
University of Zurich - EXTENDED TO INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your Total Dive
Time to exceed the Dive Time Limits, you should: - CORRECT ANSWER Use the
Maximum Dive Time as your Total Dive Time
Aching pains an hour after a dive might be: - CORRECT ANSWER Decompression
sickness
ATA rating for most hyperbaric chambers for treating divers: - CORRECT ANSWER 6
ATA
Haldane Tissue Half-Times (Compartments) - CORRECT ANSWER 5, 10, 20, 40, 75
Mins
High altitude dive - CORRECT ANSWER Any dive at greater than 1000 feet
Ideal hyperbaric chamber for dive injury - CORRECT ANSWER Multiplace, double-
lock chamber rated for service to six atmospheres
Repetitive Dive - CORRECT ANSWER Any dive started within 24 hours after a
previous dive
NAUI recommended minimum SIT time - CORRECT ANSWER 60 mins
Dives shallower than 40 ft are considered how deep on NAUI Dive Tables - CORRECT
ANSWER 40 ft
