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SSI ENRICHED AIR NITROX QUESTION
WITH COMPLETE SOLUTI ON
Question: The two most commonly used nitrox mixtures in
recreational diving are:
Correct answer: EAN 32 & EAN 36
Question: The major benefit of diving with nitrox is that it has a
lower concentration of______, which limits our time at depth.
Correct answer: Nitrogen
Question: Nitrox and the acronym EANx refer to mixtures with
oxygen concentrations (FO2) higher than:
Correct answer: 21%
Question: While diving nitrox, you can improve your safety by:
Correct answer: Using the no-decompression limits of an air
computer or air tables
Question: Which of the following is true about diving with
nitrox:
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Correct answer: Nitrox has more restrictive depth limitations
than air
Question: What nitrox mixture can be used at any depth
shallower than 99 feet?
Correct answer: EAN32, EAN36, EAN40
Question: To make sure your personal equipment is suitable for
nitrox, you have to:
Correct answer: Ask your SSI Dive Center / Dive Professional if
your equipment needs special preparation / modification
Question: A common misconception is that, when compared to
air, nitrox enables divers to dive:
Correct answer: Deeper
Question: Oxygen can be toxic to all body tissues. Its most
noticeable and immediate effects take place in the:
Correct answer: Lungs and Central Nervous System
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Question: Remaining within the recommended limiting ppO2 of
1.4 ata helps nitrox divers avoid:
Correct answer: oxygen toxicity
Question: Pulmonary Oxygen Toxicity (the Lorrain Smith
Effect) poses no real risk to recreational divers because:
Correct answer: The required exposure time before symptoms
arise is well beyond the duration of most sport dives
Question: How can the ppO2 of a breathing gas be calculated?
Correct answer: Multiple ambient pressure (depth in
atmospheres or bar) by Fraction of Oxygen (F02) found in breathing gas. - Bar x F02
Question: The recommended limiting ppO2 and maximum
limiting ppO2 for recreational nitrox dives are:
Correct answer: 1.4 and 1.6
Question: The generally-accepted threshold for CNS oxygen
toxicity is at a ppO2 of
Correct answer: 1.1 ata
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Question: The risk of CNS Oxygen Toxicity becomes more
substantial above:
Correct answer: A ppO2 of 1.6 ata
Question: If you notice symptoms of CNS oxygen toxicity in
yourself or your buddy while underwater, you should
immediately begin:
Correct answer: a controlled ascent together
Question: What is the primary sign of CNS Oxygen Toxicity
that can cause the loss of the second stage and drowning?
Correct answer: Convulsions
Question: What does ppO2 mean?
Correct answer: Partial pressure of oxygen
Question: SSI offers a complete maintenance program designed
to keep the components of your Total Diving System