ENRICHED AIR DIVER QUESTIONS WITH
CORRECT ANSWERS 2025
"Enriched air" is CORRECT ANSWER-a mixture of oxygen and nitrogen with more than 21% oxygen
The primary benefit of using enriched air is that is lets you CORRECT ANSWER-dive longer
Enriched air the no-stop limits compared to air. CORRECT ANSWER-extends
It is too simplistic to say enriched air is safer than air when well within air no stop limits because enric
hed air creates an oxygen hazard and the DCI rate is already very low in recreational air diving. (T/F)
CORRECT ANSWER-True
Using enriched air narcosis when diving. CORRECT ANSWER-has no effect on
Advantages of using an enriched air dive computer for enriched air diving include: (3) -
CORRECT ANSWER -1. providing maximum no-stop time by combining EANx and multilevel diving
2. the ability to warn you if you exceed your maximum depth
3. simplifying dive planning
the primary concern regarding enriched air and scuba equipment is CORRECT ANSWER-
that contact with high oxygen content may cause fire, explosion or deterioration.
When using enriched air with up to 40% oxygen: (3) CORRECT ANSWER-
1. Generally, you may use standard scuba equipment (except cylinder).
2. Use of oxygen compatible lubricants is generally recommended.
3. Follow all manufacturer recommendations regarding using their equipment with enriched air.
Enriched air requires a dedicated cylinder because: (2) CORRECT ANSWER-
1. it can be hazardous to unknowingly dive with enriched air.
2. it can be hazardous to blend enriched air in a conventional air cylinder.
, Based on broadly accepted international dive community practices, enriched air cylinders should have
the following markings/colors/tags: (4) CORRECT ANSWER-
1. Yellow cylinders should have a 10 cm/4 in green band at the shoulder with "Enriched Air," "Enriched
Air Nitrox," "Nitrox" or a similar designation.
2. The cylinder should have a standard visual inspection sticker.
3. The cylinder should have a contents sticker (decal) or tag.
4. The cylinder should have a sticker (decal) to indicate whether it is oxygen service rated.
The two primary concerns associated with filling enriched air cylinders are fire/explosion hazards and a
ccurate filling. These are managed by having your cylinder filled by qualified enriched air blenders, wh
o use proper procedures for filling and gas analysis. (T/F) CORRECT ANSWER-True
Only qualified, reputable enriched air blenders should fill enriched air cylinders because they have the
training and equipment to minimize the problems associated with filling enriched air cylinders. (T/F)
CORRECT ANSWER-True
The potential hazards that can arise from filling an enriched air cylinder improperly include: (2) CORRECT
ANSWER-1. fire
2. explosion
If an oxygen service rated enriched air cylinder is filled with standard compressed air, you should:
CORRECT ANSWER-have it serviced by someone qualified to work on enriched air equipment.
In looking for qualified enriched air service, look for: (3) CORRECT ANSWER-
1. Gas quality verification.
2. Proper enriched air procedures.
3. Blender certification such as Tec Gas Blender.
The two most common blends of enriched air are: CORRECT ANSWER-EANx32 and EANx36
What six signs and symptoms may precede a convulsion caused by oxygen toxicity?
CORRECT ANSWER-1. visual disturbances, including tunnel vision
2. ears ringing
CORRECT ANSWERS 2025
"Enriched air" is CORRECT ANSWER-a mixture of oxygen and nitrogen with more than 21% oxygen
The primary benefit of using enriched air is that is lets you CORRECT ANSWER-dive longer
Enriched air the no-stop limits compared to air. CORRECT ANSWER-extends
It is too simplistic to say enriched air is safer than air when well within air no stop limits because enric
hed air creates an oxygen hazard and the DCI rate is already very low in recreational air diving. (T/F)
CORRECT ANSWER-True
Using enriched air narcosis when diving. CORRECT ANSWER-has no effect on
Advantages of using an enriched air dive computer for enriched air diving include: (3) -
CORRECT ANSWER -1. providing maximum no-stop time by combining EANx and multilevel diving
2. the ability to warn you if you exceed your maximum depth
3. simplifying dive planning
the primary concern regarding enriched air and scuba equipment is CORRECT ANSWER-
that contact with high oxygen content may cause fire, explosion or deterioration.
When using enriched air with up to 40% oxygen: (3) CORRECT ANSWER-
1. Generally, you may use standard scuba equipment (except cylinder).
2. Use of oxygen compatible lubricants is generally recommended.
3. Follow all manufacturer recommendations regarding using their equipment with enriched air.
Enriched air requires a dedicated cylinder because: (2) CORRECT ANSWER-
1. it can be hazardous to unknowingly dive with enriched air.
2. it can be hazardous to blend enriched air in a conventional air cylinder.
, Based on broadly accepted international dive community practices, enriched air cylinders should have
the following markings/colors/tags: (4) CORRECT ANSWER-
1. Yellow cylinders should have a 10 cm/4 in green band at the shoulder with "Enriched Air," "Enriched
Air Nitrox," "Nitrox" or a similar designation.
2. The cylinder should have a standard visual inspection sticker.
3. The cylinder should have a contents sticker (decal) or tag.
4. The cylinder should have a sticker (decal) to indicate whether it is oxygen service rated.
The two primary concerns associated with filling enriched air cylinders are fire/explosion hazards and a
ccurate filling. These are managed by having your cylinder filled by qualified enriched air blenders, wh
o use proper procedures for filling and gas analysis. (T/F) CORRECT ANSWER-True
Only qualified, reputable enriched air blenders should fill enriched air cylinders because they have the
training and equipment to minimize the problems associated with filling enriched air cylinders. (T/F)
CORRECT ANSWER-True
The potential hazards that can arise from filling an enriched air cylinder improperly include: (2) CORRECT
ANSWER-1. fire
2. explosion
If an oxygen service rated enriched air cylinder is filled with standard compressed air, you should:
CORRECT ANSWER-have it serviced by someone qualified to work on enriched air equipment.
In looking for qualified enriched air service, look for: (3) CORRECT ANSWER-
1. Gas quality verification.
2. Proper enriched air procedures.
3. Blender certification such as Tec Gas Blender.
The two most common blends of enriched air are: CORRECT ANSWER-EANx32 and EANx36
What six signs and symptoms may precede a convulsion caused by oxygen toxicity?
CORRECT ANSWER-1. visual disturbances, including tunnel vision
2. ears ringing
