NAUI NITROX CERTIFICATION EXAM QUESTIONS
AND CORRECT ANSWERS
Question 1
Most oxygen analyzers use a(n) _________ sensor.
Correct Answer
Electrochemical
Question 2
_____ describes the relationship between absolute pressure and the volume of a gas.
Correct Answer
Boyle's Law
Question 3
Best mix to use for an oxygen partial pressure limit of 1.6 ata on a dive to 27 msw
Correct Answer
ean 40
Question 4
The term used for low oxygen in the body is:
Correct Answer
Hypoxia
Question 5
Verifying the gas analysis and recording it in a fill log is the responsibility of:
Correct Answer
,The end-user.
Question 6
Maximum operating depth of a gas mix (MOD) is determined by?
Correct Answer
Maximum acceptable partial pressure of oxygen
Question 7
Required surface interval, and recommended minimum surface interval
Correct Answer
10 minutes and 1 hour
Question 8
The simplest method of obtaining precisely mixed nitrox is:
Correct Answer
To buy it from a commercial gas supplier.
Question 9
True or False: A diver suffering from nitrogen narcosis will know that he/she is suffering
Correct Answer
False
Question 10
After the gas is analyzed, a nitrox cylinder must be:
Correct Answer
Labled with its contents
,Question 11
standard NAUI dive table can be used up to altitudes of about
Correct Answer
300 m
Question 12
Dive computers offer the advantage of giving the diver:
Correct Answer
"Credit" for the shallower portions of the dive
Question 13
What is the primary safety hazard of breathing nitrogen at depth?
Correct Answer
Narcosis
Question 14
Symptoms of hypoxia begin to appear at what pO2
Correct Answer
below 0.16 ata
Question 15
What is the nitrogen partial pressure (PN2) in EAN35 at a depth of 26 msw (85 fsw)?
Correct Answer
2.3 ata
, Question 16
The Rule of Halves is:
Correct Answer
For any no-decompression dive, end the dive with a two to three-minute stop at a depth that is
half the deepest depth of the dive, followed by a one-minute stop at 3-6 meters (10-20 feet).
Question 17
All components of the _______ are required for a fire to take place.
Correct Answer
Fire triangle
Question 18
The greatest advantages for diving using nitrox occur in what depth range?
Correct Answer
15- 33 msw (50-110 fsw)
Question 19
An oxygen analyzer should display oxygen content to an accuracy of:
Correct Answer
One-tenth of one percent
Question 20
Petroleum based lubricants are not used with high pressure oxygen because
Correct Answer
They may ignite and burn extremely easily
AND CORRECT ANSWERS
Question 1
Most oxygen analyzers use a(n) _________ sensor.
Correct Answer
Electrochemical
Question 2
_____ describes the relationship between absolute pressure and the volume of a gas.
Correct Answer
Boyle's Law
Question 3
Best mix to use for an oxygen partial pressure limit of 1.6 ata on a dive to 27 msw
Correct Answer
ean 40
Question 4
The term used for low oxygen in the body is:
Correct Answer
Hypoxia
Question 5
Verifying the gas analysis and recording it in a fill log is the responsibility of:
Correct Answer
,The end-user.
Question 6
Maximum operating depth of a gas mix (MOD) is determined by?
Correct Answer
Maximum acceptable partial pressure of oxygen
Question 7
Required surface interval, and recommended minimum surface interval
Correct Answer
10 minutes and 1 hour
Question 8
The simplest method of obtaining precisely mixed nitrox is:
Correct Answer
To buy it from a commercial gas supplier.
Question 9
True or False: A diver suffering from nitrogen narcosis will know that he/she is suffering
Correct Answer
False
Question 10
After the gas is analyzed, a nitrox cylinder must be:
Correct Answer
Labled with its contents
,Question 11
standard NAUI dive table can be used up to altitudes of about
Correct Answer
300 m
Question 12
Dive computers offer the advantage of giving the diver:
Correct Answer
"Credit" for the shallower portions of the dive
Question 13
What is the primary safety hazard of breathing nitrogen at depth?
Correct Answer
Narcosis
Question 14
Symptoms of hypoxia begin to appear at what pO2
Correct Answer
below 0.16 ata
Question 15
What is the nitrogen partial pressure (PN2) in EAN35 at a depth of 26 msw (85 fsw)?
Correct Answer
2.3 ata
, Question 16
The Rule of Halves is:
Correct Answer
For any no-decompression dive, end the dive with a two to three-minute stop at a depth that is
half the deepest depth of the dive, followed by a one-minute stop at 3-6 meters (10-20 feet).
Question 17
All components of the _______ are required for a fire to take place.
Correct Answer
Fire triangle
Question 18
The greatest advantages for diving using nitrox occur in what depth range?
Correct Answer
15- 33 msw (50-110 fsw)
Question 19
An oxygen analyzer should display oxygen content to an accuracy of:
Correct Answer
One-tenth of one percent
Question 20
Petroleum based lubricants are not used with high pressure oxygen because
Correct Answer
They may ignite and burn extremely easily
