Dive SSI - Specialty Course Enriched
Air Nitrox Level 2 (40%) (SC-EAN).
Questions with Correct Verified
Answers. Latest 2026-2027. Graded A
A common misconception is that, when compared to air, nitrox enables
divers to dive: - ANSdeeper
According to the SSI CNS Clock Table you have two different CNS clock
limits, one for a single dive, and one for a 24-hour period. For a ppO2 of 1.4
ata, these limits are: - ANS150 mins single dive / 180 mins 24 hrs
Always check the FO2 and MOD listed on the contents tag. If it shows a
limiting ppO2 of more than 1.4 ata you should: - ANSDisregard it and use a
more conservative ppO2 of max. 1.4 ata
Any cylinder containing a gas other than air must be: - ANSClearly labeled
Because O2 sensors are sensitive to changes in atmospheric pressure and
moisture, the analysis of the same gas will show you: - ANSSlightly
Different Reading
Compared to air, nitrox has a higher concentration of: - ANSOxygen
1
, Diving with nitrox has the potential to provide: - ANSlonger no-
decompression limits and longer repetitive dives
Diving with nitrox reduces the exposure to nitrogen, therefore you can't get
decompression sickness while diving nitrox. Right or Wrong? - ANSWrong
Equivalent Air Depth (EAD) means: - ANSBreathing a particular nitrox
mixture at a depth exposes your body to the same overall nitrogen level
experienced by breathing air at a shallower depth.
Exposing silicone lubricants, used to service first and second stages, to
high concentrations of oxygen under pressure can cause: - ANSFire and
Explosion
How can the ppO2 of a breathing gas be calculated? - ANSMultiply
ambient pressure by the fraction of oxygen (FO2) found in the breathing
gas.
How does planning nitrox dives differ from planning air dives? - ANSYou
must also manage your exposure to oxygen
If a diver mistakenly uses a nitrox cylinder, thinking it was air, they would
risk: - ANSUnanticipated CNS oxygen Toxicity
If there is any doubt about the O2 rating of the cylinder it should: -
ANSUndergo a O2 cleaning prior to the next filling
2
Air Nitrox Level 2 (40%) (SC-EAN).
Questions with Correct Verified
Answers. Latest 2026-2027. Graded A
A common misconception is that, when compared to air, nitrox enables
divers to dive: - ANSdeeper
According to the SSI CNS Clock Table you have two different CNS clock
limits, one for a single dive, and one for a 24-hour period. For a ppO2 of 1.4
ata, these limits are: - ANS150 mins single dive / 180 mins 24 hrs
Always check the FO2 and MOD listed on the contents tag. If it shows a
limiting ppO2 of more than 1.4 ata you should: - ANSDisregard it and use a
more conservative ppO2 of max. 1.4 ata
Any cylinder containing a gas other than air must be: - ANSClearly labeled
Because O2 sensors are sensitive to changes in atmospheric pressure and
moisture, the analysis of the same gas will show you: - ANSSlightly
Different Reading
Compared to air, nitrox has a higher concentration of: - ANSOxygen
1
, Diving with nitrox has the potential to provide: - ANSlonger no-
decompression limits and longer repetitive dives
Diving with nitrox reduces the exposure to nitrogen, therefore you can't get
decompression sickness while diving nitrox. Right or Wrong? - ANSWrong
Equivalent Air Depth (EAD) means: - ANSBreathing a particular nitrox
mixture at a depth exposes your body to the same overall nitrogen level
experienced by breathing air at a shallower depth.
Exposing silicone lubricants, used to service first and second stages, to
high concentrations of oxygen under pressure can cause: - ANSFire and
Explosion
How can the ppO2 of a breathing gas be calculated? - ANSMultiply
ambient pressure by the fraction of oxygen (FO2) found in the breathing
gas.
How does planning nitrox dives differ from planning air dives? - ANSYou
must also manage your exposure to oxygen
If a diver mistakenly uses a nitrox cylinder, thinking it was air, they would
risk: - ANSUnanticipated CNS oxygen Toxicity
If there is any doubt about the O2 rating of the cylinder it should: -
ANSUndergo a O2 cleaning prior to the next filling
2
