SDI Computer Nitrox Class – Questions With
Appropriate Solutions
What are the most common symptoms of decompression sickness? Correct
Answer - Pain in the joints, numbness, paralysis, loss of balance, muscle
weakness, and impaired thinking
What is the recommended first aid for decompression sickness? Correct
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? Correct Answer - 16%
What is the maximum percentage of oxygen that sport divers use in a Nitrox
mixture? Correct Answer - 40%
What is the maximum recommended depth for using 100 percent oxygen?
Correct Answer - 20 feet
What FO2 does EAN 32 contain? Correct Answer - 68 percent nitrogen
and 32 percent oxygen
What are two reasons why EAN32 is a good choice for Nitrox diving?
Correct 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? Correct Answer - 1.6
What does the term oxygen toxicity mean? Correct 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? Correct Answer -
Oxygen poisoning
What are the words represented by the acronym CONVENTID? Correct
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?
Correct Answer - adhesive decal, generally 10-13 cm/4-5 in in width, that
is designed to completely encircle the diameter of the tank. The tape is usually
printed in yellow with bold green letters with the words Enriched Air and/or
Nitrox printed continuously on it. This tape makes it quick and easy to spot a
Nitrox bottle in a group of tanks.
What are the two most important pieces of information that will appear on a
Nitrox fill tag or label? Correct Answer - Nitrox mixture used in the tank
(FO2) and its MOD
What is the most important setting that must be made to your Nitrox
computer before every dive? Correct Answer - oxygen % (FO2) must be
set
What is an oxygen analyzer? Correct 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? Correct 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? Correct
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? Correct Answer - 1%
Appropriate Solutions
What are the most common symptoms of decompression sickness? Correct
Answer - Pain in the joints, numbness, paralysis, loss of balance, muscle
weakness, and impaired thinking
What is the recommended first aid for decompression sickness? Correct
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? Correct Answer - 16%
What is the maximum percentage of oxygen that sport divers use in a Nitrox
mixture? Correct Answer - 40%
What is the maximum recommended depth for using 100 percent oxygen?
Correct Answer - 20 feet
What FO2 does EAN 32 contain? Correct Answer - 68 percent nitrogen
and 32 percent oxygen
What are two reasons why EAN32 is a good choice for Nitrox diving?
Correct 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? Correct Answer - 1.6
What does the term oxygen toxicity mean? Correct 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? Correct Answer -
Oxygen poisoning
What are the words represented by the acronym CONVENTID? Correct
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?
Correct Answer - adhesive decal, generally 10-13 cm/4-5 in in width, that
is designed to completely encircle the diameter of the tank. The tape is usually
printed in yellow with bold green letters with the words Enriched Air and/or
Nitrox printed continuously on it. This tape makes it quick and easy to spot a
Nitrox bottle in a group of tanks.
What are the two most important pieces of information that will appear on a
Nitrox fill tag or label? Correct Answer - Nitrox mixture used in the tank
(FO2) and its MOD
What is the most important setting that must be made to your Nitrox
computer before every dive? Correct Answer - oxygen % (FO2) must be
set
What is an oxygen analyzer? Correct 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? Correct 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? Correct
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? Correct Answer - 1%
