ENRICHED AIR NITROX EXPECTED QUESTIONS
WITH VERIFIED ANSWERS (2026)
●● If you experience a computer failure underwater , you should :
Answer: Do not enter the water again for at least 24 hours and watch for
signs of decompression sickness
Signal your buddy , and ascend with them while they monitor your
ascent on their computer
As an added precaution , perform a longer than normal safety stop if
breathing gas supply permits
All answers are correct
●● Which of the following is a significant difference between planning a
dive on nitrox and planning a dive using air ?
Answer: You must also manage your exposure to oxygen
●● Which special skills are required to dive with nitrox ?
Answer: None
●● The risk of CNS oxygen toxicity becomes more substantial above :
Answer: A ppO2 of 1.6 bar
, ●● A common misconception is , that compared to air , Nitrox enables
Divers to dive :
Answer: deeper
●● How is the ppO2 of a breathing gas calculated ?
Answer: Multiplying ambient pressure by the fraction of oxygen ( FO2 )
in the breathing gas
●● The single most important aspect of managing your exposure to
oxygen is , controlling the intensity of that exposure by determining :
Answer: A Maximum Operating Depth ( MOD ) , based on a limiting
pp02 of 1.4 bar or less .
●● According to the SSI CNS Clock table you have two different CNS
Clock limits . One for a single dive , and one for a 24 hr period . These
limits are for an ppO2 of 1.4 bar :
Answer: 150 mins single dive / 180 mins 24 hrs
●● What does pp02 mean ?
Answer: Partial pressure of oxygen
●● Which special skills are required before you dive with nitrox ?
Answer: Correct analysis of cylinder content in the field and at the
blending station
WITH VERIFIED ANSWERS (2026)
●● If you experience a computer failure underwater , you should :
Answer: Do not enter the water again for at least 24 hours and watch for
signs of decompression sickness
Signal your buddy , and ascend with them while they monitor your
ascent on their computer
As an added precaution , perform a longer than normal safety stop if
breathing gas supply permits
All answers are correct
●● Which of the following is a significant difference between planning a
dive on nitrox and planning a dive using air ?
Answer: You must also manage your exposure to oxygen
●● Which special skills are required to dive with nitrox ?
Answer: None
●● The risk of CNS oxygen toxicity becomes more substantial above :
Answer: A ppO2 of 1.6 bar
, ●● A common misconception is , that compared to air , Nitrox enables
Divers to dive :
Answer: deeper
●● How is the ppO2 of a breathing gas calculated ?
Answer: Multiplying ambient pressure by the fraction of oxygen ( FO2 )
in the breathing gas
●● The single most important aspect of managing your exposure to
oxygen is , controlling the intensity of that exposure by determining :
Answer: A Maximum Operating Depth ( MOD ) , based on a limiting
pp02 of 1.4 bar or less .
●● According to the SSI CNS Clock table you have two different CNS
Clock limits . One for a single dive , and one for a 24 hr period . These
limits are for an ppO2 of 1.4 bar :
Answer: 150 mins single dive / 180 mins 24 hrs
●● What does pp02 mean ?
Answer: Partial pressure of oxygen
●● Which special skills are required before you dive with nitrox ?
Answer: Correct analysis of cylinder content in the field and at the
blending station
