NAUI Nitrox Diver Final Exam with
Complete Solutions
The main reason to dive with "nitrox" is to reduce exposure to some of the problems in
diving caused by: - ANS-Nitrogen
We say that nitrogen is an inert gas. This means_____. - ANS-Our bodies do not use
the nitrogen we breathe.
What is the primary safety hazard of breathing nitrogen at depth? - ANS-Narcosis
NAUI sanctioned enriched air nitrox training in: - ANS-1992
Benefits of nitrox include: - ANS-Extended bottom time
Increased safety margins
Shorter surface intervals
The greatest advantages for diving using nitrox occur in what depth range? - ANS-15-
33 msw (50-110 fsw)
True or False: A scuba diver breathing nitrox avoids any risk of nitrogen narcosis. -
ANS-False
If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas mix? - ANS-0.36
_____ describes the relationship between absolute pressure and the volume of a gas. -
ANS-Boyle's Law
To find the partial pressure of a gas in a mixture: - ANS-Multiply the gas fraction by the
absolute pressure.
If contamination of oxygen cleaned equipment is suspected, the equipment must be: -
ANS-Re-cleaned
Scuba regulators do not need to be specially cleaned for nitrox service unless they will
be used with pure oxygen or an oxygen level that is above: - ANS-40%
Scuba cylinders that are to contain enriched-air nitrox must be properly cleaned and: -
ANS-Labled
, The continuous flow blending method injects a measured flow of oxygen into the air: -
ANS-Before it reaches the intake of the compressor.
The simplest method of obtaining precisely mixed nitrox is: - ANS-To buy it from a
commercial gas supplier.
An essential operation in using an oxygen analyzer is: - ANS-Calibrating it.
Most oxygen analyzers use a(n) _________ sensor. - ANS-Electrochemical
Verifying the gas analysis and recording it in a fill log is the responsibility of: - ANS-The
end-user.
The acceptable flow rate for gas analysis is: - ANS-About one liter per minute.
After the gas is analyzed, a nitrox cylinder must be: - ANS-Labled with its contents
An oxygen analyzer should display oxygen content to an accuracy of: - ANS-One-tenth
of one percent
If one quantity of gas will dissolve at one atmosphere of pressure, then three quantities
of gas will dissolve at three atmospheres." This statement refers to which law? - ANS-
Henry's Law
What is one atm is mm of mercury? - ANS-760
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 - ANS-Boyle's Law
True or False: A diver suffering from nitrogen narcosis will know that he/she is suffering
- ANS-False
The controlled release of pressure during an ascent during SCUBA is called - ANS-
Decompression
Symptoms of hypoxia begin to appear at what pO2 - ANS-below 0.16 ata
Recommended maximum pO2 for enriched air nitrox diving is? - ANS-1.4 ata
First precursor symptom for oxygen toxicity? - ANS-Highly variable
Two most commonly used nitrox mixtures, Nitrox 1 and Nitrox 2 - ANS-32% and 36%
oxygen
Maximum operating depth of a gas mix (MOD) is determined by? - ANS-Maximum
acceptable partial pressure of oxygen
Complete Solutions
The main reason to dive with "nitrox" is to reduce exposure to some of the problems in
diving caused by: - ANS-Nitrogen
We say that nitrogen is an inert gas. This means_____. - ANS-Our bodies do not use
the nitrogen we breathe.
What is the primary safety hazard of breathing nitrogen at depth? - ANS-Narcosis
NAUI sanctioned enriched air nitrox training in: - ANS-1992
Benefits of nitrox include: - ANS-Extended bottom time
Increased safety margins
Shorter surface intervals
The greatest advantages for diving using nitrox occur in what depth range? - ANS-15-
33 msw (50-110 fsw)
True or False: A scuba diver breathing nitrox avoids any risk of nitrogen narcosis. -
ANS-False
If a nitrox mix is 36% oxygen, what is the fraction of oxygen in the gas mix? - ANS-0.36
_____ describes the relationship between absolute pressure and the volume of a gas. -
ANS-Boyle's Law
To find the partial pressure of a gas in a mixture: - ANS-Multiply the gas fraction by the
absolute pressure.
If contamination of oxygen cleaned equipment is suspected, the equipment must be: -
ANS-Re-cleaned
Scuba regulators do not need to be specially cleaned for nitrox service unless they will
be used with pure oxygen or an oxygen level that is above: - ANS-40%
Scuba cylinders that are to contain enriched-air nitrox must be properly cleaned and: -
ANS-Labled
, The continuous flow blending method injects a measured flow of oxygen into the air: -
ANS-Before it reaches the intake of the compressor.
The simplest method of obtaining precisely mixed nitrox is: - ANS-To buy it from a
commercial gas supplier.
An essential operation in using an oxygen analyzer is: - ANS-Calibrating it.
Most oxygen analyzers use a(n) _________ sensor. - ANS-Electrochemical
Verifying the gas analysis and recording it in a fill log is the responsibility of: - ANS-The
end-user.
The acceptable flow rate for gas analysis is: - ANS-About one liter per minute.
After the gas is analyzed, a nitrox cylinder must be: - ANS-Labled with its contents
An oxygen analyzer should display oxygen content to an accuracy of: - ANS-One-tenth
of one percent
If one quantity of gas will dissolve at one atmosphere of pressure, then three quantities
of gas will dissolve at three atmospheres." This statement refers to which law? - ANS-
Henry's Law
What is one atm is mm of mercury? - ANS-760
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 - ANS-Boyle's Law
True or False: A diver suffering from nitrogen narcosis will know that he/she is suffering
- ANS-False
The controlled release of pressure during an ascent during SCUBA is called - ANS-
Decompression
Symptoms of hypoxia begin to appear at what pO2 - ANS-below 0.16 ata
Recommended maximum pO2 for enriched air nitrox diving is? - ANS-1.4 ata
First precursor symptom for oxygen toxicity? - ANS-Highly variable
Two most commonly used nitrox mixtures, Nitrox 1 and Nitrox 2 - ANS-32% and 36%
oxygen
Maximum operating depth of a gas mix (MOD) is determined by? - ANS-Maximum
acceptable partial pressure of oxygen
