ENRICHED AIR NITROX LATEST VERIFIED EXAM
QUESTIONS WITH CORRECT ANSWERS (2026)
●● The primary benefit of using enriched air is that is lets you
Answer: dive longer
●● Enriched air _______ the no-stop limits compared to air.
Answer: extends
●● It is too simplistic to say enriched air is safer than air when well
within air no stop limits because enriched air creates an oxygen hazard
and the DCI rate is already very low in recreational air diving. (T/F)
Answer: True
●● Using enriched air ____ narcosis when diving.
Answer: has no effect on
●● Advantages of using an enriched air dive computer for enriched air
diving include: (3)
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
Answer: that contact with high oxygen content may cause fire, explosion
or deterioration.
●● When using enriched air with up to 40% oxygen: (3)
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)
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)
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 accurate filling. These are
managed by having your cylinder filled by qualified enriched air
blenders, who use proper procedures for filling and gas analysis. (T/F)
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)
Answer: True
●● The potential hazards that can arise from filling an enriched air
cylinder improperly include: (2)
Answer: 1. fire
2. explosion
●● If an oxygen service rated enriched air cylinder is filled with
standard compressed air, you should:
QUESTIONS WITH CORRECT ANSWERS (2026)
●● The primary benefit of using enriched air is that is lets you
Answer: dive longer
●● Enriched air _______ the no-stop limits compared to air.
Answer: extends
●● It is too simplistic to say enriched air is safer than air when well
within air no stop limits because enriched air creates an oxygen hazard
and the DCI rate is already very low in recreational air diving. (T/F)
Answer: True
●● Using enriched air ____ narcosis when diving.
Answer: has no effect on
●● Advantages of using an enriched air dive computer for enriched air
diving include: (3)
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
Answer: that contact with high oxygen content may cause fire, explosion
or deterioration.
●● When using enriched air with up to 40% oxygen: (3)
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)
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)
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 accurate filling. These are
managed by having your cylinder filled by qualified enriched air
blenders, who use proper procedures for filling and gas analysis. (T/F)
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)
Answer: True
●● The potential hazards that can arise from filling an enriched air
cylinder improperly include: (2)
Answer: 1. fire
2. explosion
●● If an oxygen service rated enriched air cylinder is filled with
standard compressed air, you should:
