PADI ENRICHED AIR DIVER STUDY EXAM 2025/2026
QUESTIONS WITH ANSWERS RATED A+
✔✔If you accidentally exceed the oxygen exposure limits for your computer, you should:
(2) - ✔✔1. ascend immediately but slowly and end the dive.
2. not dive for 24 hours, or as stipulated by the manufacturer.
✔✔Who must personally verify the analysis of the oxygen content in an enriched air
cylinder before it is used? - ✔✔The diver who will use the cylinder
✔✔The first step in analyzing enriched air is to calibrate the oxygen analyzer. (T/F) -
✔✔True
✔✔The standard of practice for the accuracy of enriched air analysis is plus or minus -
✔✔1%
✔✔After analyzing enriched air, you should compare the oxygen percent with - ✔✔the
percentage marked on the contents sticker or tag.
✔✔What four guidelines apply to diving with an enriched air dive computer? - ✔✔1.
Know the blends max depth; stay shallower than the max depth
2. stay well within no-stop and O2 exposure limit
3. every diver needs an individual computer set for individual blends
4. make safety stops and follow conservative diving practices
✔✔When diving with an enriched air computer: (3) - ✔✔1. Stay well within the
computer's no stop and oxygen exposure limits.
2. Make safety stops and follow all the conservative diving practices you've already
learned.
3. Know the blend's maximum depth and rely on the computer warning as a secondary
alert only.
✔✔You set most enriched air computers by letting the computer automatically analyze
the blend you're using. (T/F) - ✔✔False
✔✔If you forget to set your enriched air computer before a dive: (2) - ✔✔1. the
computer may enter an error mode.
2. you may have to wait 12 hours before you use it again.
✔✔If your enriched air dive computer fails during a dive - ✔✔ascend immediately, make
a safety stop at 5 metres/15 feet and end the dive.
✔✔If a diver using enriched air convulses underwater, you should attempt to give the
diver regular air from a pony bottle. (T/F) - ✔✔False
, ✔✔If a diver is suspected of having DCI after a dive using enriched air, you should: (2) -
✔✔1. Contact local emergency personnel and diver emergency services.
2. Administer emergency oxygen and first aid as you normally would.
✔✔The primary benefit of using enriched air nitrox is that it - ✔✔gives you longer no
stop times compared to air
✔✔When using EANx, you should expect narcosis to be - ✔✔no different from diving
with air
✔✔The primary concern regarding enriched air nitrox and equipment is high oxygen
content. (T/F) - ✔✔True
✔✔The recommendations for using equipment, other than cylinders, with enriched air
with up to 40% oxygen, include that: (3) - ✔✔1. you can use regular scuba equipment
for EANx blends with up to 40% oxygen.
2. local laws/standards may require special fittings or cleanings.
3. oxygen compatible lubricants are generally recommended
✔✔The potential hazards of improper enriched air filling procedures include: (2) - ✔✔1.
fire or explosion hazard
2. making the percentage of oxygen in the blend questionable
✔✔The markings that, according to broadly accepted dive community practices, you
should have on a scuba cylinder used for enriched air nitrox include: (4) - ✔✔1. a green
and yellow band (or only green on a yellow cylinder) around the cylinder shoulder
reading NITROX, ENRICHED AIR or the like
2. a sticker indicating whether the cylinder is rated for oxygen service
3. a sticker with the diver's name, the EANx blend, fill date and maximum depth of the
blend
4. any markings required by local laws or standards
✔✔The maximum oxygen partial pressure is _____________ and contingency partial
pressure is ________________. - ✔✔1.4 ; 1.6
✔✔The primary hazard of exceeding oxygen limits is having a _________________
which is likely to lead to ______________ underwater. - ✔✔convulsion ; drowning
✔✔To avoid the primary hazard of exceeding oxygen exposure limits: (2) - ✔✔1. remain
well within the oxygen limits of your computer
2. stay shallower than the minimum depth of the blend
✔✔Signs and symptoms always precede a CNS convulsion. (T/F) - ✔✔False
QUESTIONS WITH ANSWERS RATED A+
✔✔If you accidentally exceed the oxygen exposure limits for your computer, you should:
(2) - ✔✔1. ascend immediately but slowly and end the dive.
2. not dive for 24 hours, or as stipulated by the manufacturer.
✔✔Who must personally verify the analysis of the oxygen content in an enriched air
cylinder before it is used? - ✔✔The diver who will use the cylinder
✔✔The first step in analyzing enriched air is to calibrate the oxygen analyzer. (T/F) -
✔✔True
✔✔The standard of practice for the accuracy of enriched air analysis is plus or minus -
✔✔1%
✔✔After analyzing enriched air, you should compare the oxygen percent with - ✔✔the
percentage marked on the contents sticker or tag.
✔✔What four guidelines apply to diving with an enriched air dive computer? - ✔✔1.
Know the blends max depth; stay shallower than the max depth
2. stay well within no-stop and O2 exposure limit
3. every diver needs an individual computer set for individual blends
4. make safety stops and follow conservative diving practices
✔✔When diving with an enriched air computer: (3) - ✔✔1. Stay well within the
computer's no stop and oxygen exposure limits.
2. Make safety stops and follow all the conservative diving practices you've already
learned.
3. Know the blend's maximum depth and rely on the computer warning as a secondary
alert only.
✔✔You set most enriched air computers by letting the computer automatically analyze
the blend you're using. (T/F) - ✔✔False
✔✔If you forget to set your enriched air computer before a dive: (2) - ✔✔1. the
computer may enter an error mode.
2. you may have to wait 12 hours before you use it again.
✔✔If your enriched air dive computer fails during a dive - ✔✔ascend immediately, make
a safety stop at 5 metres/15 feet and end the dive.
✔✔If a diver using enriched air convulses underwater, you should attempt to give the
diver regular air from a pony bottle. (T/F) - ✔✔False
, ✔✔If a diver is suspected of having DCI after a dive using enriched air, you should: (2) -
✔✔1. Contact local emergency personnel and diver emergency services.
2. Administer emergency oxygen and first aid as you normally would.
✔✔The primary benefit of using enriched air nitrox is that it - ✔✔gives you longer no
stop times compared to air
✔✔When using EANx, you should expect narcosis to be - ✔✔no different from diving
with air
✔✔The primary concern regarding enriched air nitrox and equipment is high oxygen
content. (T/F) - ✔✔True
✔✔The recommendations for using equipment, other than cylinders, with enriched air
with up to 40% oxygen, include that: (3) - ✔✔1. you can use regular scuba equipment
for EANx blends with up to 40% oxygen.
2. local laws/standards may require special fittings or cleanings.
3. oxygen compatible lubricants are generally recommended
✔✔The potential hazards of improper enriched air filling procedures include: (2) - ✔✔1.
fire or explosion hazard
2. making the percentage of oxygen in the blend questionable
✔✔The markings that, according to broadly accepted dive community practices, you
should have on a scuba cylinder used for enriched air nitrox include: (4) - ✔✔1. a green
and yellow band (or only green on a yellow cylinder) around the cylinder shoulder
reading NITROX, ENRICHED AIR or the like
2. a sticker indicating whether the cylinder is rated for oxygen service
3. a sticker with the diver's name, the EANx blend, fill date and maximum depth of the
blend
4. any markings required by local laws or standards
✔✔The maximum oxygen partial pressure is _____________ and contingency partial
pressure is ________________. - ✔✔1.4 ; 1.6
✔✔The primary hazard of exceeding oxygen limits is having a _________________
which is likely to lead to ______________ underwater. - ✔✔convulsion ; drowning
✔✔To avoid the primary hazard of exceeding oxygen exposure limits: (2) - ✔✔1. remain
well within the oxygen limits of your computer
2. stay shallower than the minimum depth of the blend
✔✔Signs and symptoms always precede a CNS convulsion. (T/F) - ✔✔False
