SDI COMPUTER NITROX CLASS
EXAM QUESTIONS & ANSWERS
What are the most common symptoms of decompression sickness? - Correct Answers -
Pain in the joints, numbness, paralysis, loss of balance, muscle weakness, and
impaired thinking
What is the recommended first aid for decompression sickness? - Correct Answers -
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 Answers -16%
What is the maximum percentage of oxygen that sport divers use in a Nitrox mixture? -
Correct Answers -40%
What is the maximum recommended depth for using 100 percent oxygen? - Correct
Answers -20 feet
What FO2 does EAN 32 contain? - Correct Answers -68 percent nitrogen and 32
percent oxygen
What are two reasons why EAN32 is a good choice for Nitrox diving? - Correct Answers
-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 Answers -1.6
What does the term oxygen toxicity mean? - Correct Answers -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 Answers -Oxygen
poisoning
, What are the words represented by the acronym CONVENTID? - Correct Answers -Con
- convulsions, V - visual disturbances,E - ringing/auditory hallucinations, N - nausea, T -
twitching, I - irritability/apprehension, D – dizziness
What is the best description of a blender's job? - Correct Answers -To supply you with
the gas that you ask for when you present your cylinder to be filled.
True or False. You ask a Nitrox blender to fill your cylinders with EAN30, but they
analyze at 32 percent. You should not be concerned, as this is within the acceptable
range of accuracy for Nitrox fills. - Correct Answers -False
True or False. Oxygen sensors may be sensitive to factors such as temperature,
moisture and age. - Correct Answers -True
What does a Nitrox tank wrap used to identify Nitrox cylinders look like? - Correct
Answers -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 Answers -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 Answers -oxygen % (FO2) must be set
What is an oxygen analyzer? - Correct Answers -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 Answers -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 Answers -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 Answers -1%
What is the function of a fill station log? - Correct Answers -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? - Correct
Answers -consult your local SDI Dive Center or do some research on the Internet.
EXAM QUESTIONS & ANSWERS
What are the most common symptoms of decompression sickness? - Correct Answers -
Pain in the joints, numbness, paralysis, loss of balance, muscle weakness, and
impaired thinking
What is the recommended first aid for decompression sickness? - Correct Answers -
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 Answers -16%
What is the maximum percentage of oxygen that sport divers use in a Nitrox mixture? -
Correct Answers -40%
What is the maximum recommended depth for using 100 percent oxygen? - Correct
Answers -20 feet
What FO2 does EAN 32 contain? - Correct Answers -68 percent nitrogen and 32
percent oxygen
What are two reasons why EAN32 is a good choice for Nitrox diving? - Correct Answers
-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 Answers -1.6
What does the term oxygen toxicity mean? - Correct Answers -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 Answers -Oxygen
poisoning
, What are the words represented by the acronym CONVENTID? - Correct Answers -Con
- convulsions, V - visual disturbances,E - ringing/auditory hallucinations, N - nausea, T -
twitching, I - irritability/apprehension, D – dizziness
What is the best description of a blender's job? - Correct Answers -To supply you with
the gas that you ask for when you present your cylinder to be filled.
True or False. You ask a Nitrox blender to fill your cylinders with EAN30, but they
analyze at 32 percent. You should not be concerned, as this is within the acceptable
range of accuracy for Nitrox fills. - Correct Answers -False
True or False. Oxygen sensors may be sensitive to factors such as temperature,
moisture and age. - Correct Answers -True
What does a Nitrox tank wrap used to identify Nitrox cylinders look like? - Correct
Answers -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 Answers -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 Answers -oxygen % (FO2) must be set
What is an oxygen analyzer? - Correct Answers -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 Answers -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 Answers -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 Answers -1%
What is the function of a fill station log? - Correct Answers -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? - Correct
Answers -consult your local SDI Dive Center or do some research on the Internet.
