SSI ENRICHED AIR NITROX EXAM
QUESTIONS AND ANSWERS
EANx stands for _________ - Correct Answers -Enriched Air Nitrox
What is Nitrox? - Correct Answers -any gas mixture composed of nitrogen and oxygen
What is another name for Enriched Air Nitrox - Correct Answers -ENAx
What makes compressed air different from the air we breathe everyday? - Correct
Answers -all impurities have been filtered out
What does the x in EANx stand for? - Correct Answers -the FO2 value
What are the two most commonly used Nitrox mixtures? - Correct Answers -EAN32 and
EAN36
What is an advantage of using Enhanced Air Nitrox? - Correct Answers -longer no-
decompression limits, shorter surface intervals and longer repetitive dives
What is a limitation of diving with EANx? - Correct Answers -Nitrox requires additional
training in order to use safely
Compared to air, nitrox has a higher concentration of: - Correct Answers -oxygen
Is it true, that nitrox is designed for ultra-deep diving? - Correct Answers -No, nitrox has
more restrictive depth limitations than air
A common misconception is, that compared to air, Nitrox enables Divers to dive: -
Correct Answers -deeper
While diving nitrox, you can improve your safety by: - Correct Answers -Using the no-
decompression limits of an air computer or air tables
The air that we breathe is approximately: - Correct Answers -79% nitrogen and 21%
oxygen
, EAN32 and EAN36 are commonly referred to as - Correct Answers -Nitrox 1 and Nitrox
2
Diving nitrox exposes your body to more _______ - Correct Answers -oxygen
What Does ppO2 Mean? - Correct Answers -partial pressure oxygen
What is the range of ppO2 levels that can sustain life - Correct Answers -0.10 - 1.60
ppO2
What is the normal ppO2 level of air - Correct Answers -0.21 ppO2
The formula for determining the partial pressure of oxygen (ppO2): - Correct Answers -
ppO₂ = [ ( depth / 10m ) + 1 ] × FO₂
What is the recommended ppO2 level for recreational diving? - Correct Answers -0.21 -
1.40 ppO2
Equivalent air depth (EAD) - Correct Answers -The relationship between nitrogen
absorbed at a particular depth while breathing nitrox and the depth at which an
equivalent absorption rate would occur while breathing air.
Diving with nitrox reduces the exposure to nitrogen, therefore you can`t get
decompression sickness while diving nitrox. Right or Wrong? - Correct Answers -Wrong
The single most important aspect of managing your exposure to oxygen is, controlling
the intensity of that exposure by determining: - Correct Answers -A Maximum Operating
Depth (MOD), based on a limiting ppO2 of 1.4 bar or less.
What is the best, safest, and most comfortable way to track your oxygen and nitrogen
exposure at the same time? - Correct Answers -Use a nitrox-programmable dive
computer
What is the formula for calculating EAD - Correct Answers -EAD = [ ( 1 - FO2 ) x ( D +
10 ) / 0.79 ] - 10
The formula above can be used to find the equivalent air depth when actual depth is
known.
What is the formula for calculating actual depth when EAD is known? - Correct Answers
-D = [ 0.79 X ( EAD + 10 ) / ( 1 - FO2 ) ] - 10
Why can't we dive with 100% oxygen? - Correct Answers -The risk of oxygen toxicity,
which is much more likely when the ppO2 level is raised past the recommended limit.
C + VENT + ID — The symptoms of CNS oxygen toxicity include: - Correct Answers -
Convulsions, Visual Distortion, Ears (any change in normal hearing function), Nausea,
Twitchiness, Irritability, and Dizziness
QUESTIONS AND ANSWERS
EANx stands for _________ - Correct Answers -Enriched Air Nitrox
What is Nitrox? - Correct Answers -any gas mixture composed of nitrogen and oxygen
What is another name for Enriched Air Nitrox - Correct Answers -ENAx
What makes compressed air different from the air we breathe everyday? - Correct
Answers -all impurities have been filtered out
What does the x in EANx stand for? - Correct Answers -the FO2 value
What are the two most commonly used Nitrox mixtures? - Correct Answers -EAN32 and
EAN36
What is an advantage of using Enhanced Air Nitrox? - Correct Answers -longer no-
decompression limits, shorter surface intervals and longer repetitive dives
What is a limitation of diving with EANx? - Correct Answers -Nitrox requires additional
training in order to use safely
Compared to air, nitrox has a higher concentration of: - Correct Answers -oxygen
Is it true, that nitrox is designed for ultra-deep diving? - Correct Answers -No, nitrox has
more restrictive depth limitations than air
A common misconception is, that compared to air, Nitrox enables Divers to dive: -
Correct Answers -deeper
While diving nitrox, you can improve your safety by: - Correct Answers -Using the no-
decompression limits of an air computer or air tables
The air that we breathe is approximately: - Correct Answers -79% nitrogen and 21%
oxygen
, EAN32 and EAN36 are commonly referred to as - Correct Answers -Nitrox 1 and Nitrox
2
Diving nitrox exposes your body to more _______ - Correct Answers -oxygen
What Does ppO2 Mean? - Correct Answers -partial pressure oxygen
What is the range of ppO2 levels that can sustain life - Correct Answers -0.10 - 1.60
ppO2
What is the normal ppO2 level of air - Correct Answers -0.21 ppO2
The formula for determining the partial pressure of oxygen (ppO2): - Correct Answers -
ppO₂ = [ ( depth / 10m ) + 1 ] × FO₂
What is the recommended ppO2 level for recreational diving? - Correct Answers -0.21 -
1.40 ppO2
Equivalent air depth (EAD) - Correct Answers -The relationship between nitrogen
absorbed at a particular depth while breathing nitrox and the depth at which an
equivalent absorption rate would occur while breathing air.
Diving with nitrox reduces the exposure to nitrogen, therefore you can`t get
decompression sickness while diving nitrox. Right or Wrong? - Correct Answers -Wrong
The single most important aspect of managing your exposure to oxygen is, controlling
the intensity of that exposure by determining: - Correct Answers -A Maximum Operating
Depth (MOD), based on a limiting ppO2 of 1.4 bar or less.
What is the best, safest, and most comfortable way to track your oxygen and nitrogen
exposure at the same time? - Correct Answers -Use a nitrox-programmable dive
computer
What is the formula for calculating EAD - Correct Answers -EAD = [ ( 1 - FO2 ) x ( D +
10 ) / 0.79 ] - 10
The formula above can be used to find the equivalent air depth when actual depth is
known.
What is the formula for calculating actual depth when EAD is known? - Correct Answers
-D = [ 0.79 X ( EAD + 10 ) / ( 1 - FO2 ) ] - 10
Why can't we dive with 100% oxygen? - Correct Answers -The risk of oxygen toxicity,
which is much more likely when the ppO2 level is raised past the recommended limit.
C + VENT + ID — The symptoms of CNS oxygen toxicity include: - Correct Answers -
Convulsions, Visual Distortion, Ears (any change in normal hearing function), Nausea,
Twitchiness, Irritability, and Dizziness
