PADI ENRICHED AIR DIVER 2025/2026 QUESTIONS WITH
ANSWERS RATED A+
✔✔KN15 What is the first step you do when analyzing an enriched air blend? -
✔✔attach the analyzer to the flow restricter or flow meter supplying air from a cylinder
and calibrate it to 20.8-21% (depending upon analyzer)
✔✔KN16 What should you do if your enriched air computer fails during a dive? (Choose
all that apply.) - ✔✔1.Immediately ascend, make a safety stop at 5 metres/15 feet and
surface.
2. After leaving the water, do not dive again for 12 hours, or as recommended by the
computer manufacturer.
✔✔KN17 If a diver convulses underwater, your priority is to get the diver to the surface.
Treat the diver as an unresponsive diver. - ✔✔true
✔✔KN18 If a diver is suspected of having decompression illness after an enriched air
dive, the steps to take are (choose all that apply) - ✔✔1.Provide emergency oxygen and
first aid/CPR as necessary.
2.Contact, EMS, DAN and/or other appropriate area emergency services.
3.When possible, tell emergency personnel the diver's profile (depths and times),
whether the diver was using a computer or tables, and the EANx blend.
✔✔1-1 "Enriched air" is - ✔✔a mixture of oxygen and nitrogen with more than 21%
oxygen.
✔✔1-2 The primary benefit of using enriched air is that it lets you - ✔✔dive longer.
✔✔1-3 Enriched air __________ the no stop limits compared to air. - ✔✔extends
✔✔1-4 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. - ✔✔True
✔✔1-5 Using enriched air __________ narcosis when diving. - ✔✔has no effect on
✔✔1-6 Advantages of using an enriched air dive computer for enriched air diving
include (choose all that apply) - ✔✔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.
✔✔2-1 The primary concern regarding enriched air and scuba equipment is: - ✔✔that
contact with high oxygen content may cause fire, explosion or deterioration.
, ✔✔2-2 When using enriched air with up to 40% oxygen (choose all that apply) - ✔✔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.
✔✔2-3 Enriched air requires a dedicated cylinder because (choose all that apply) -
✔✔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.
✔✔2-4 Based on broadly accepted international dive community practices, enriched air
cylinders should have the following markings/colors/tags (choose all that apply) - ✔✔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.
✔✔2-5 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. - ✔✔True
✔✔2-6 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. - ✔✔True
✔✔2-7 The potential hazards that can arise from filling an enriched air cylinder
improperly include (choose all that apply) - ✔✔1. Fire
2. Explosion
✔✔2-8 If an oxygen service rated enriched air cylinder is filled with standard
compressed air, you should: - ✔✔have it serviced by someone qualified to work on
enriched air equipment.
✔✔2-9 In looking for qualified enriched air service, look for (choose all that apply) -
✔✔1. Gas quality verification.
2. Proper enriched air procedures.
3. Blender certification such as Tec Gas Blender.
✔✔2-10 The two most common blends of enriched air are: - ✔✔EANx32 and EANx36
ANSWERS RATED A+
✔✔KN15 What is the first step you do when analyzing an enriched air blend? -
✔✔attach the analyzer to the flow restricter or flow meter supplying air from a cylinder
and calibrate it to 20.8-21% (depending upon analyzer)
✔✔KN16 What should you do if your enriched air computer fails during a dive? (Choose
all that apply.) - ✔✔1.Immediately ascend, make a safety stop at 5 metres/15 feet and
surface.
2. After leaving the water, do not dive again for 12 hours, or as recommended by the
computer manufacturer.
✔✔KN17 If a diver convulses underwater, your priority is to get the diver to the surface.
Treat the diver as an unresponsive diver. - ✔✔true
✔✔KN18 If a diver is suspected of having decompression illness after an enriched air
dive, the steps to take are (choose all that apply) - ✔✔1.Provide emergency oxygen and
first aid/CPR as necessary.
2.Contact, EMS, DAN and/or other appropriate area emergency services.
3.When possible, tell emergency personnel the diver's profile (depths and times),
whether the diver was using a computer or tables, and the EANx blend.
✔✔1-1 "Enriched air" is - ✔✔a mixture of oxygen and nitrogen with more than 21%
oxygen.
✔✔1-2 The primary benefit of using enriched air is that it lets you - ✔✔dive longer.
✔✔1-3 Enriched air __________ the no stop limits compared to air. - ✔✔extends
✔✔1-4 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. - ✔✔True
✔✔1-5 Using enriched air __________ narcosis when diving. - ✔✔has no effect on
✔✔1-6 Advantages of using an enriched air dive computer for enriched air diving
include (choose all that apply) - ✔✔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.
✔✔2-1 The primary concern regarding enriched air and scuba equipment is: - ✔✔that
contact with high oxygen content may cause fire, explosion or deterioration.
, ✔✔2-2 When using enriched air with up to 40% oxygen (choose all that apply) - ✔✔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.
✔✔2-3 Enriched air requires a dedicated cylinder because (choose all that apply) -
✔✔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.
✔✔2-4 Based on broadly accepted international dive community practices, enriched air
cylinders should have the following markings/colors/tags (choose all that apply) - ✔✔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.
✔✔2-5 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. - ✔✔True
✔✔2-6 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. - ✔✔True
✔✔2-7 The potential hazards that can arise from filling an enriched air cylinder
improperly include (choose all that apply) - ✔✔1. Fire
2. Explosion
✔✔2-8 If an oxygen service rated enriched air cylinder is filled with standard
compressed air, you should: - ✔✔have it serviced by someone qualified to work on
enriched air equipment.
✔✔2-9 In looking for qualified enriched air service, look for (choose all that apply) -
✔✔1. Gas quality verification.
2. Proper enriched air procedures.
3. Blender certification such as Tec Gas Blender.
✔✔2-10 The two most common blends of enriched air are: - ✔✔EANx32 and EANx36
