NAUI NITROX DIVER FINAL EXAM
QUESTIONS AND ANSWERS
Nitrogen -Answer-The main reason to dive with "nitrox" is to reduce exposure to
some of the problems in diving caused by:
Our bodies do not use the nitrogen we breathe. -Answer-We say that nitrogen is an
inert gas. This means_____.
Narcosis -Answer-What is the primary safety hazard of breathing nitrogen at depth?
1992 -Answer-NAUI sanctioned enriched air nitrox training in:
Extended bottom time
Increased safety margins
Shorter surface intervals -Answer-Benefits of nitrox include:
15- 33 msw (50-110 fsw) -Answer-The greatest advantages for diving using nitrox
occur in what depth range?
False -Answer-True or False: A scuba diver breathing nitrox avoids any risk of
nitrogen narcosis.
0.36 -Answer-If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas
mix?
Boyle's Law -Answer-_____ describes the relationship between absolute pressure
and the volume of a gas.
Multiply the gas fraction by the absolute pressure. -Answer-To find the partial
pressure of a gas in a mixture:
Absolute pressure -Answer-The water pressure plus atmospheric pressure equals:
4.4 ata -Answer-What is the absolute pressure at 34 msw (111 fsw)?
2.3 ata -Answer-What is the nitrogen partial pressure (PN2) in EAN35 at a depth of
26 msw (85 fsw)?
1.4 ata -Answer-What is the oxygen partial pressure (PO2) of EAN38 at 27 msw (87
fsw)?
54 msw (178 fsw) -Answer-At what depth in the ocean is the absolute pressure 6.4
ata?
0.35 -Answer-If the PO2 at 30 msw (98 fsw) is 1.4 atmospheres, what is the oxygen
fraction of the breathing mixture?
QUESTIONS AND ANSWERS
Nitrogen -Answer-The main reason to dive with "nitrox" is to reduce exposure to
some of the problems in diving caused by:
Our bodies do not use the nitrogen we breathe. -Answer-We say that nitrogen is an
inert gas. This means_____.
Narcosis -Answer-What is the primary safety hazard of breathing nitrogen at depth?
1992 -Answer-NAUI sanctioned enriched air nitrox training in:
Extended bottom time
Increased safety margins
Shorter surface intervals -Answer-Benefits of nitrox include:
15- 33 msw (50-110 fsw) -Answer-The greatest advantages for diving using nitrox
occur in what depth range?
False -Answer-True or False: A scuba diver breathing nitrox avoids any risk of
nitrogen narcosis.
0.36 -Answer-If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas
mix?
Boyle's Law -Answer-_____ describes the relationship between absolute pressure
and the volume of a gas.
Multiply the gas fraction by the absolute pressure. -Answer-To find the partial
pressure of a gas in a mixture:
Absolute pressure -Answer-The water pressure plus atmospheric pressure equals:
4.4 ata -Answer-What is the absolute pressure at 34 msw (111 fsw)?
2.3 ata -Answer-What is the nitrogen partial pressure (PN2) in EAN35 at a depth of
26 msw (85 fsw)?
1.4 ata -Answer-What is the oxygen partial pressure (PO2) of EAN38 at 27 msw (87
fsw)?
54 msw (178 fsw) -Answer-At what depth in the ocean is the absolute pressure 6.4
ata?
0.35 -Answer-If the PO2 at 30 msw (98 fsw) is 1.4 atmospheres, what is the oxygen
fraction of the breathing mixture?
