NAUI Nitrox Diver Final Exam
The main reason to dive with "nitrox" is to reduce exposure to some of the problems in
diving caused by: - Answer -Nitrogen
We say that nitrogen is an inert gas. This means_____. - Answer -Our bodies do not
use the nitrogen we breathe.
What is the primary safety hazard of breathing nitrogen at depth? - Answer -Narcosis
NAUI sanctioned enriched air nitrox training in: - Answer -1992
Benefits of nitrox include: - Answer -Extended bottom time
Increased safety margins
Shorter surface intervals
The greatest advantages for diving using nitrox occur in what depth range? - Answer -
15- 33 msw (50-110 fsw)
True or False: A scuba diver breathing nitrox avoids any risk of nitrogen narcosis. -
Answer -False
If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas mix? - Answer -
0.36
_____ describes the relationship between absolute pressure and the volume of a gas. -
Answer -Boyle's Law
To find the partial pressure of a gas in a mixture: - Answer -Multiply the gas fraction by
the absolute pressure.
The water pressure plus atmospheric pressure equals: - Answer -Absolute pressure
What is the absolute pressure at 34 msw (111 fsw)? - Answer -4.4 ata
What is the nitrogen partial pressure (PN2) in EAN35 at a depth of 26 msw (85 fsw)? -
Answer -2.3 ata
, What is the oxygen partial pressure (PO2) of EAN38 at 27 msw (87 fsw)? - Answer -1.4
ata
At what depth in the ocean is the absolute pressure 6.4 ata? - Answer -54 msw (178
fsw)
If the PO2 at 30 msw (98 fsw) is 1.4 atmospheres, what is the oxygen fraction of the
breathing mixture? - Answer -0.35
What is the partial pressure of nitrogen in air at 40 msw (130 fsw)? - Answer -3.9 ata
True or False. Narcosis is reduced significantly when diving with enriched air nitrox. -
Answer -False
The mechanisms of nitrogen narcosis are thought to be similar to: - Answer -Anesthesia
Oxygen is used by the body in: - Answer -Metabolism
The term used for low oxygen in the body is: - Answer -Hypoxia
Breathing high partial pressures of oxygen can cause: - Answer -Convulsions
The accepted oxygen partial pressure exposure limit for recreational nitrox diving is: -
Answer -1.4 ata
At the first signs or symptoms of oxygen toxicity, a diver should: - Answer -Terminate
the dive.
Historically, what are the two standard nitrox mixes? - Answer -32% oxygen and 36%
oxygen
What is the "best mix" to use for an oxygen partial pressure limit of 1.4 ata on a dive to
27 msw (90 fsw)? - Answer -EAN38
Standard NAUI Dive Tables can be used for altitudes up to about: - Answer -300 meters
(1000 feet)
NAUI RGBM sea level Dive Tables can be used for altitudes up to: - Answer -610
meters (2000 feet)
The NAUI EAN32 and EAN36 Dive Tables have a tolerance of _____ of the tables'
value. - Answer -+/- 1%
Using the NAUI EAN32 Dive Tables, a diver makes a dive to 33 msw (110 fsw) for 20
minutes. After a surface interval of 2 hours, the diver makes a second dive, also on
The main reason to dive with "nitrox" is to reduce exposure to some of the problems in
diving caused by: - Answer -Nitrogen
We say that nitrogen is an inert gas. This means_____. - Answer -Our bodies do not
use the nitrogen we breathe.
What is the primary safety hazard of breathing nitrogen at depth? - Answer -Narcosis
NAUI sanctioned enriched air nitrox training in: - Answer -1992
Benefits of nitrox include: - Answer -Extended bottom time
Increased safety margins
Shorter surface intervals
The greatest advantages for diving using nitrox occur in what depth range? - Answer -
15- 33 msw (50-110 fsw)
True or False: A scuba diver breathing nitrox avoids any risk of nitrogen narcosis. -
Answer -False
If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas mix? - Answer -
0.36
_____ describes the relationship between absolute pressure and the volume of a gas. -
Answer -Boyle's Law
To find the partial pressure of a gas in a mixture: - Answer -Multiply the gas fraction by
the absolute pressure.
The water pressure plus atmospheric pressure equals: - Answer -Absolute pressure
What is the absolute pressure at 34 msw (111 fsw)? - Answer -4.4 ata
What is the nitrogen partial pressure (PN2) in EAN35 at a depth of 26 msw (85 fsw)? -
Answer -2.3 ata
, What is the oxygen partial pressure (PO2) of EAN38 at 27 msw (87 fsw)? - Answer -1.4
ata
At what depth in the ocean is the absolute pressure 6.4 ata? - Answer -54 msw (178
fsw)
If the PO2 at 30 msw (98 fsw) is 1.4 atmospheres, what is the oxygen fraction of the
breathing mixture? - Answer -0.35
What is the partial pressure of nitrogen in air at 40 msw (130 fsw)? - Answer -3.9 ata
True or False. Narcosis is reduced significantly when diving with enriched air nitrox. -
Answer -False
The mechanisms of nitrogen narcosis are thought to be similar to: - Answer -Anesthesia
Oxygen is used by the body in: - Answer -Metabolism
The term used for low oxygen in the body is: - Answer -Hypoxia
Breathing high partial pressures of oxygen can cause: - Answer -Convulsions
The accepted oxygen partial pressure exposure limit for recreational nitrox diving is: -
Answer -1.4 ata
At the first signs or symptoms of oxygen toxicity, a diver should: - Answer -Terminate
the dive.
Historically, what are the two standard nitrox mixes? - Answer -32% oxygen and 36%
oxygen
What is the "best mix" to use for an oxygen partial pressure limit of 1.4 ata on a dive to
27 msw (90 fsw)? - Answer -EAN38
Standard NAUI Dive Tables can be used for altitudes up to about: - Answer -300 meters
(1000 feet)
NAUI RGBM sea level Dive Tables can be used for altitudes up to: - Answer -610
meters (2000 feet)
The NAUI EAN32 and EAN36 Dive Tables have a tolerance of _____ of the tables'
value. - Answer -+/- 1%
Using the NAUI EAN32 Dive Tables, a diver makes a dive to 33 msw (110 fsw) for 20
minutes. After a surface interval of 2 hours, the diver makes a second dive, also on
