PADI, NITROX EXAM QUESTIONS WITH
ANSWERS
What is "Nitrox"? - Answer-A gas composed of Oxygen and Nitrogen.
When did you first breath "Nitrox"? - Answer-Your first breath on this planet! You
breathed Oxygen and Nitrogen
What is "ENRICHED AIR"?
Pg 3 - Answer-Air that has been enriched with Oxygen.
Air: 21% Oxygen (O2), 79% Nitrogen (N)
What does "EANx 36" stand for?
Pg 3 - Answer-Enriched air Nitrox 36%
Can be called:
1) EANx36
2) Enriched Air 36
3) Enriched Air Nitrox 36
4) Or, Nitrox 36
What is the primary benefit of using enriched air?
Pg 4 - Answer-It exposes you to less nitrogen, which cause DCS.
What are 3 other advantages of using enriched air?
Pg 4 - Answer-1) Extends allowable bottom time.
2) Reduces need to "Push" air No Decompression Limits.
3) Reduces overall Nitrogen load on multiple dives.
How does using enriched air affect "No Stop Limits"?
Pg 4 - Answer-Longer "No Decompression Limits. Less Nitrogen in body. Body
metabolizes the extra O2.
How does using an "Enriched Air Computer" affect your "No Stop Limits"?
Pg 4 - Answer-Used with "Enriched Air Computer" you have even longer No Stop
Limits.
Why is it wrong to say, "enriched air is safer than air when diving well within Air No
Decompression limits"?
Pg 4 - Answer-You increase your O2 exposure which can be SIGNIFICANTLY more
hazardous than Nitrogen problems.
How does using enriched air affect NARCOSIS when diving?
Pg 5 - Answer-NO DIFFERANCE
Theoretically O2 has about the same Narcotic potential as Nitrogen.
, What are 3 advantages of using an enriched air dive computer for enriched air diving?
Pg 5 - Answer-1) More "No Stop Time" with multiple dives.
2) Alerts you if you exceed Max depth for your blend.
3) Simplify planning & execution while warning you near limits.
What is the primary concern regarding enriched air and SCUBA equipment?
Pg 7 - Answer-High O2 content:
1) Some material may burn or explode.
2) Also may cause rapid deterioration. (Oxidation)
What are the requirements and recommendations for SCUBA equipment used with
enriched air with up to 40% O2.
Pg 7 - Answer-No answer at this time go look up
Why does enriched air diving require a dedicated cylinder? 2 reasons
Pg 8 - Answer-1) Reduce confusion.
2) Clean & lubricated for high O2 exposure.
What color coding, stickers, decals and tags should an enriched air cylinder have?
Pg 9 - Answer-1) Yellow cylinder have a 4" Green Band with yellow or white letters
"Enriched Air", "Enriched Air Nitrox" or "Nitrox"
2) Non-Yellow cylinder have additional 1" high band above and below the green band
above.
3) UK: Black & White shoulder pattern as well
What are the 2 primary concerns associated with filling enriched air cylinders?
Pg 10 - Answer-1) Fire/Explosion Hazard due to lubricants (trace hydrocarbons) worst
with partial pressure filling method.
2) Percentage of O2 in blend +/- 1 % changes Max allowable depth and No
Decompression limits.
Why should only qualified reputable enriched air blenders fill enriched air cylinders?
Pg 11 - Answer-Due to potential hazards of Fire and Explosion.
What is the potential hazard of improper enriched air filling procedures?
Pg 11 - Answer-FIRE/EXPLOSION.
Never put pure O2 in a standard cylinder OR fill it from a conventional SCUBA air fill
station.
What should you do if an enriched air cylinder or oxygen-serviced equipment is used
with standard compressed air?
Pg 12 - Answer-It must be serviced and cleaned by someone qualified to service
enriched air equipment.
How do you identify qualified enriched air blenders and enriched air service? 3 things
ANSWERS
What is "Nitrox"? - Answer-A gas composed of Oxygen and Nitrogen.
When did you first breath "Nitrox"? - Answer-Your first breath on this planet! You
breathed Oxygen and Nitrogen
What is "ENRICHED AIR"?
Pg 3 - Answer-Air that has been enriched with Oxygen.
Air: 21% Oxygen (O2), 79% Nitrogen (N)
What does "EANx 36" stand for?
Pg 3 - Answer-Enriched air Nitrox 36%
Can be called:
1) EANx36
2) Enriched Air 36
3) Enriched Air Nitrox 36
4) Or, Nitrox 36
What is the primary benefit of using enriched air?
Pg 4 - Answer-It exposes you to less nitrogen, which cause DCS.
What are 3 other advantages of using enriched air?
Pg 4 - Answer-1) Extends allowable bottom time.
2) Reduces need to "Push" air No Decompression Limits.
3) Reduces overall Nitrogen load on multiple dives.
How does using enriched air affect "No Stop Limits"?
Pg 4 - Answer-Longer "No Decompression Limits. Less Nitrogen in body. Body
metabolizes the extra O2.
How does using an "Enriched Air Computer" affect your "No Stop Limits"?
Pg 4 - Answer-Used with "Enriched Air Computer" you have even longer No Stop
Limits.
Why is it wrong to say, "enriched air is safer than air when diving well within Air No
Decompression limits"?
Pg 4 - Answer-You increase your O2 exposure which can be SIGNIFICANTLY more
hazardous than Nitrogen problems.
How does using enriched air affect NARCOSIS when diving?
Pg 5 - Answer-NO DIFFERANCE
Theoretically O2 has about the same Narcotic potential as Nitrogen.
, What are 3 advantages of using an enriched air dive computer for enriched air diving?
Pg 5 - Answer-1) More "No Stop Time" with multiple dives.
2) Alerts you if you exceed Max depth for your blend.
3) Simplify planning & execution while warning you near limits.
What is the primary concern regarding enriched air and SCUBA equipment?
Pg 7 - Answer-High O2 content:
1) Some material may burn or explode.
2) Also may cause rapid deterioration. (Oxidation)
What are the requirements and recommendations for SCUBA equipment used with
enriched air with up to 40% O2.
Pg 7 - Answer-No answer at this time go look up
Why does enriched air diving require a dedicated cylinder? 2 reasons
Pg 8 - Answer-1) Reduce confusion.
2) Clean & lubricated for high O2 exposure.
What color coding, stickers, decals and tags should an enriched air cylinder have?
Pg 9 - Answer-1) Yellow cylinder have a 4" Green Band with yellow or white letters
"Enriched Air", "Enriched Air Nitrox" or "Nitrox"
2) Non-Yellow cylinder have additional 1" high band above and below the green band
above.
3) UK: Black & White shoulder pattern as well
What are the 2 primary concerns associated with filling enriched air cylinders?
Pg 10 - Answer-1) Fire/Explosion Hazard due to lubricants (trace hydrocarbons) worst
with partial pressure filling method.
2) Percentage of O2 in blend +/- 1 % changes Max allowable depth and No
Decompression limits.
Why should only qualified reputable enriched air blenders fill enriched air cylinders?
Pg 11 - Answer-Due to potential hazards of Fire and Explosion.
What is the potential hazard of improper enriched air filling procedures?
Pg 11 - Answer-FIRE/EXPLOSION.
Never put pure O2 in a standard cylinder OR fill it from a conventional SCUBA air fill
station.
What should you do if an enriched air cylinder or oxygen-serviced equipment is used
with standard compressed air?
Pg 12 - Answer-It must be serviced and cleaned by someone qualified to service
enriched air equipment.
How do you identify qualified enriched air blenders and enriched air service? 3 things
