SDI Computer Nitrox Class Exam Questions
With Correct Answers
What are the most common symptoms of decompression sickness? - answer✔Pain in the joints,
numbness, paralysis, loss of balance, muscle weakness, and impaired thinking
What is the recommended first aid for decompression sickness? - answer✔Controlling their
temperature and administering pure oxygen, then immediately getting them airlifted to a hospital
for the decompression chamber
What is the minimum concentration of oxygen required to maintain consciousness at sea level? -
answer✔16%
What is the maximum percentage of oxygen that sport divers use in a Nitrox mixture? -
answer✔40%
What is the maximum recommended depth for using 100 percent oxygen? - answer✔20 feet
What FO2 does EAN 32 contain? - answer✔68 percent nitrogen and 32 percent oxygen
What are two reasons why EAN32 is a good choice for Nitrox diving? - answer✔Will provide
you with a good combination of extended bottom time and unrestricted depth within the sport
diving range, &. using EAN32 poses less risk in terms of exposure to oxygen than other richer
mixtures.
What is the maximum partial pressure of oxygen (PO2) we use in Nitrox diving? - answer✔1.6
What does the term oxygen toxicity mean? - answer✔condition that occurs when the diver
breathes a mixture of gas that allows the PO2 to exceed 1.6 by going too deep or exceeding the
time limit at a lower PO2
What is the primary risk associated with Nitrox diving? - answer✔Oxygen poisoning
What are the words represented by the acronym CONVENTID? - answer✔Con - convulsions, V
- visual disturbances,E - ringing/auditory hallucinations, N - nausea, T - twitching, I -
irritability/apprehension, D - dizziness
What does a Nitrox tank wrap used to identify Nitrox cylinders look like? - answer✔adhesive
decal, generally 10-13 cm/4-5 in in width, that is designed to completely encircle the diameter of
What is an oxygen analyzer? - answer✔electronic devices that are used to measure the
percentage of oxygen in a gas mixture
What are two equipment items that do not need to be cleaned for oxygen service? -
answer✔buoyancy compensators and their low pressure inflators and dry suit inflation valves
What does the term blender mean, as it applies to Nitrox diving? - answer✔A Nitrox or gas
blender has specialized training allowing him or her to fill dive cylinders with the exact gas that
divers need for their planned dive
What is the acceptable range of accuracy blenders must adhere to when asked to supply a Nitrox
mixture with a particular FO2? - answer✔1%
What is the function of a fill station log? - answer✔Indicates that you take responsibility for the
Nitrox that has been delivered to you, and that you are satisfied that your cylinders have been
filled properly.
What are three ways to check for Nitrox availability when planning a trip? - answer✔consult
your local SDI Dive Center or do some research on the Internet. Another popular spot to look for
dive centers that provide Nitrox is in the directory in the back of popular dive magazines.
What is the FO2 setting most dive computers default to? - answer✔21%
Why it is important for team members to use the same Nitrox mixture? - answer✔So that if your
dive buddy fills his tank with air, or a different Nitrox mixture that allows him to go deeper
without violating his maximum PO2, and dives beyond the MOD for the mixture you are using,
you will not be able to go to his aid if he needs help without violating the MOD of your mixture,
so you both may extend your bottom time and enjoy the same no-decompression limits.
What does the term technical diving refer to? - answer✔a type of recreational diving that goes
beyond sport diving limits. Typically, it requires additional specialized training, planning
techniques, and equipment.
What are the key differences between the SDI Computer Nitrox Diver course and the TDI
Advanced Nitrox Diver course? - answer✔SDI computer Nitrox: learned how to use your dive
computer to make dives using Nitrox mixtures containing 40 percent oxygen or less.
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