NAUI NITROX DIVER EXAM REVIEW
QUESTIONS AND ANSWERS
If the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw),
what is the fraction of oxygen in the mix? -answer-0.28
What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? -answer-
0.65 ata
The symptoms of nitrogen narcosis parallel those often seen in -answer-alcohol
intoxication
____ law states: "at a constant temperature, the volume of a gas varies inversely
with absolute pressure, while the density of a gas varies directly with absolute
pressure." -answer-boyle's
Each 10 meters (33 feet) that you descend in the ocean adds another atmosphere of
pressure to the one atmosphere of surface pressure -answer-true
A diver suffering from nitrogen narcosis will always be aware that he is impaired -
answer-false
The mechanisms of nitrogen narcosis are thought to be similar to -answer-
anesthesia
The controlled release of pressure during ascent from a scuba dive is -answer-
decompression
Which gas in air is essential to sustain life? -answer-oxygen
The primary waste product from the metabolism of oxygen is -answer-carbon dioxide
For most people, symptoms of hypoxia begin to appear when the po2 -answer-falls
below about 0.16 ata
Pulmonary oxygen toxicity results from -answer-prolonged exposure to elevated
oxygen partial pressures
One of the factors that can increase susceptibility to cns oxygen toxicity is -answer-
heavy exercise and carbon dioxide buildup
The acronym used to remember signs and symptoms of oxygen toxicity is -answer-
conventid
The recommended maximum po2 for enriched air nitrox diving is -answer-1.4 ata
The first precursor symptom of cns oxygen toxicity is -answer-precursor symptoms
are highly variable
, A stuporous condition characterized by impaired mental and physical performance
and changes in mood and behavior is known as -answer-nitrogen narcosis
The two most commonly used nitrox mixtures, also known as noaa nitrox i and noaa
nitrox ii are -answer-32% and 36% oxygen
The maximum operating depth (mod) of a gas mix is determined by -answer-the
maximum acceptable partial pressure of oxygen
Calculate the normal maximum operating depth for ean32 (po2 = 1.4 ata) -answer-
34 msw (111 fsw)
What is the "best mix" (not to exceed 40% o2) to use for an oxygen partial pressure
limit of 1.6 ata on a dive to 27 msw (90 fsw) -answer-ean40
The maximum depth dived with a given nitrox mixture is known as -answer-
maximum operating depth
Oxygen percentages on the oceanx calculator can be set from -answer-25%-40%
_____ is the highest percentage of oxygen that can be used at the planned dive
depth -answer-best mix
A diver using ean32 makes a dive to 33 msw (110 fsw) for 23 minutes. After a
surface interval of 2 hours, he makes a second dive (also using ean32) to 23 msw
(75 fsw). Using naui ean32 dive tables, what is his adjusted maximum dive time for
the second dive? -answer-24 minutes
If the same diver in question 1 were using naui rgbm ean32 dive tables, what would
be his maximum dive time for the second dive? -answer-47 minutes
Naui nitrox dive tables have a gas-mix tolerance of -answer-plus or minus 1%
Standard naui dive tables can be used up to altitudes of about -answer-300 meters
(1000 feet)
Naui rgbm sea level dive tables can be used for altitudes up to -answer-610 meters
(2000 feet)
Naui nitrox dive tables and naui rgbm nitrox dive tables are available for -answer-
ean32 and ean36
What is the equivalent depth for a 23 msw (75 fsw) dive using ean32 -answer-18
msw (60 fsw)
Dive computers offer the advantage of giving the diver -answer-"credit" for the
shallow portions of the dive
QUESTIONS AND ANSWERS
If the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw),
what is the fraction of oxygen in the mix? -answer-0.28
What is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? -answer-
0.65 ata
The symptoms of nitrogen narcosis parallel those often seen in -answer-alcohol
intoxication
____ law states: "at a constant temperature, the volume of a gas varies inversely
with absolute pressure, while the density of a gas varies directly with absolute
pressure." -answer-boyle's
Each 10 meters (33 feet) that you descend in the ocean adds another atmosphere of
pressure to the one atmosphere of surface pressure -answer-true
A diver suffering from nitrogen narcosis will always be aware that he is impaired -
answer-false
The mechanisms of nitrogen narcosis are thought to be similar to -answer-
anesthesia
The controlled release of pressure during ascent from a scuba dive is -answer-
decompression
Which gas in air is essential to sustain life? -answer-oxygen
The primary waste product from the metabolism of oxygen is -answer-carbon dioxide
For most people, symptoms of hypoxia begin to appear when the po2 -answer-falls
below about 0.16 ata
Pulmonary oxygen toxicity results from -answer-prolonged exposure to elevated
oxygen partial pressures
One of the factors that can increase susceptibility to cns oxygen toxicity is -answer-
heavy exercise and carbon dioxide buildup
The acronym used to remember signs and symptoms of oxygen toxicity is -answer-
conventid
The recommended maximum po2 for enriched air nitrox diving is -answer-1.4 ata
The first precursor symptom of cns oxygen toxicity is -answer-precursor symptoms
are highly variable
, A stuporous condition characterized by impaired mental and physical performance
and changes in mood and behavior is known as -answer-nitrogen narcosis
The two most commonly used nitrox mixtures, also known as noaa nitrox i and noaa
nitrox ii are -answer-32% and 36% oxygen
The maximum operating depth (mod) of a gas mix is determined by -answer-the
maximum acceptable partial pressure of oxygen
Calculate the normal maximum operating depth for ean32 (po2 = 1.4 ata) -answer-
34 msw (111 fsw)
What is the "best mix" (not to exceed 40% o2) to use for an oxygen partial pressure
limit of 1.6 ata on a dive to 27 msw (90 fsw) -answer-ean40
The maximum depth dived with a given nitrox mixture is known as -answer-
maximum operating depth
Oxygen percentages on the oceanx calculator can be set from -answer-25%-40%
_____ is the highest percentage of oxygen that can be used at the planned dive
depth -answer-best mix
A diver using ean32 makes a dive to 33 msw (110 fsw) for 23 minutes. After a
surface interval of 2 hours, he makes a second dive (also using ean32) to 23 msw
(75 fsw). Using naui ean32 dive tables, what is his adjusted maximum dive time for
the second dive? -answer-24 minutes
If the same diver in question 1 were using naui rgbm ean32 dive tables, what would
be his maximum dive time for the second dive? -answer-47 minutes
Naui nitrox dive tables have a gas-mix tolerance of -answer-plus or minus 1%
Standard naui dive tables can be used up to altitudes of about -answer-300 meters
(1000 feet)
Naui rgbm sea level dive tables can be used for altitudes up to -answer-610 meters
(2000 feet)
Naui nitrox dive tables and naui rgbm nitrox dive tables are available for -answer-
ean32 and ean36
What is the equivalent depth for a 23 msw (75 fsw) dive using ean32 -answer-18
msw (60 fsw)
Dive computers offer the advantage of giving the diver -answer-"credit" for the
shallow portions of the dive
