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NAUI NITROX DIVER 2025 BRAND
NEW ACTUAL EXAM WITH ANSWERS.
1. If flying or ascending to altitude after diving, wait _____ hours
after a single dive and _____ hours after a series of repetitive
dives. Another good rule to follow is to wait _____ hours prior
to flying or ascending to altitude. - correct answer -12, 18, 24
2. If using the NAUI RGBM Dive Tables, a minimum surface
interval of _____ is required. - correct answer -1 hour
3. Petroleum-based lubricants are not used with high-pressure
oxygen because: - correct answer -They may ignite and burn
extremely easily.
4. All components of the _______ are required for a fire to take
place. - correct answer -Fire triangle
5. Any equipment that is used with pure oxygen or an oxygen
level above _______ must be cleaned for oxygen service. -
correct answer -40%
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6. Cylinders and tank valves to be used with enriched air must be
cleaned and _______ lubricants used. - correct answer -
Oxygen-compatible
7. Even though you will not be using nitrox mixtures above 40%
oxygen, your cylinder should be oxygen cleaned and identified
as a nitrox cylinder because: - correct answer -It may be
subjected to pure oxygen at elevated pressures when it is filled.
8. In _________ mixing, a measured pressure of oxygen is added
to a cylinder, which is then filled to service pressure with air. -
correct answer -Partial pressure
9. The _____ method injects a measured flow of pure oxygen into
the air before it reaches the intake of the compressor. - correct
answer -Continuous-flow
10. _____ uses a material called a molecular sieve that
selectively adsorbs a thin layer of nitrogen from the air that
NAUI NITROX DIVER 2025 BRAND
NEW ACTUAL EXAM WITH ANSWERS.
1. If flying or ascending to altitude after diving, wait _____ hours
after a single dive and _____ hours after a series of repetitive
dives. Another good rule to follow is to wait _____ hours prior
to flying or ascending to altitude. - correct answer -12, 18, 24
2. If using the NAUI RGBM Dive Tables, a minimum surface
interval of _____ is required. - correct answer -1 hour
3. Petroleum-based lubricants are not used with high-pressure
oxygen because: - correct answer -They may ignite and burn
extremely easily.
4. All components of the _______ are required for a fire to take
place. - correct answer -Fire triangle
5. Any equipment that is used with pure oxygen or an oxygen
level above _______ must be cleaned for oxygen service. -
correct answer -40%
, Page | 2
6. Cylinders and tank valves to be used with enriched air must be
cleaned and _______ lubricants used. - correct answer -
Oxygen-compatible
7. Even though you will not be using nitrox mixtures above 40%
oxygen, your cylinder should be oxygen cleaned and identified
as a nitrox cylinder because: - correct answer -It may be
subjected to pure oxygen at elevated pressures when it is filled.
8. In _________ mixing, a measured pressure of oxygen is added
to a cylinder, which is then filled to service pressure with air. -
correct answer -Partial pressure
9. The _____ method injects a measured flow of pure oxygen into
the air before it reaches the intake of the compressor. - correct
answer -Continuous-flow
10. _____ uses a material called a molecular sieve that
selectively adsorbs a thin layer of nitrogen from the air that
