Nitrox Certification Exam Questions With
Correct Answers Graded A+
What are some of the common terms that divers use when referring to Nitrox? Answer
Probably you have also heard it referred to by a variety of names: enriched air, oxygen
enriched air, SafeAir, Denitrogenated Air, EAN, EANx, NOAA Nitrox I or NOAA Nitrox II.
What are the main component gasses found in air, and what percentage of the total gas
mixture each gas represents? - Answer - How ever, unlike air which typically contains
about 79 percent nitrogen and 21 percent oxygen Nitrox contains a greater percentage
of oxygen.
What does term Nitrox mean? - Answer - Nitrox a mix of nitrogen and oxygen just like air.
What is the common term that divers use in describing a person who mixes the Nitrox to
fill the scuba cylinders? Answer -Blender
What are the common Nitrox mixes used by divers? Answer 22-40 percent mixture
-EAN32: 68 percent nitrogen, 32 percent oxygen.
-EAN36: 64 percent nitrogen, 36 percent oxygen.
What are the two major advantages that divers have when using Nitrox? - Answer -The
first is that you can increase your maximum allowable bottom time. This happens
because the extra oxygen added to your breathing gas when it was filled has displaced
nitrogen. Because there is less nitrogen in the mix to be absorbed by your body you can
spend longer at depth before you reach the nitrogen limit - which is the decompression
limit. Because you are absorbing less nitrogen on a given dive you can often shorten
your surface intervals.
State for how long, during any 24-hour period, you can be exposed to a Nitrox mixture at
its Maximum Operating Depth (MOD)? -Answer-Over a 24-hour period you will also have
a cumulative time limit for oxygen exposure at the maximum operating depth of two and
a half hours in any 24-hour period.
, How might a dive computer help prevent decompression sickness? Answer When you
make a dive using a dive computer, it will measure roughly how much nitrogen your
body has absorbed and alerts you when it is time for you to ascend and the rate at which
it is safest to ascend.
What might happen if you dive too deep or longer than you should?
- Answer -However, if you have had a very long dive, or you dove deep, the dive
computer will indicate that you must make a stop at a certain depth, in order for the
excess nitrogen in your body to have sufficient time to escape without problems. Your
computer may ask you to make one stop or a series of stops, commonly known as
decompression stops. What does the term decompression stop mean? -Answer -: Within
these stops the excess nitrogen in your body is circulated back into the lungs where you
exhaled each time you breathe.
What are three reasons why sport divers should avoid decompression diving?
-Answers-sport divers should avoid decompression dives by planning their dives with
their dive computers and closely monitoring their computers during their dives.
What is the main cause of decompression sickness? -Answer- Normally, decompression
sickness occurs when you have too much nitrogen in your body and you rise to the
surface too quickly. The nitrogen comes out of solution and creates a bubble thus
disrupting the flow of blood in that part of the body.
What are the most common symptoms of decompression sickness? -Answer -:
Symptoms include, but are not limited to, pain in the joints, numbness, paralysis, loss of
balance, muscle weakness, and impaired thinking.
What is the recommended first aid for decompression sickness? -Answer-First aid for
decompression sickness includes treating the diver for shock by laying them down and
keeping them either from being to cold or too warm. However the most important thing
to do is provide an injured diver pure oxygen as soon as possible and transport to a
hyperbaric chamber where proper recompression therapy can be performed.
What partial pressure of oxygen will allow a person to maintain consciousness at sea
Correct Answers Graded A+
What are some of the common terms that divers use when referring to Nitrox? Answer
Probably you have also heard it referred to by a variety of names: enriched air, oxygen
enriched air, SafeAir, Denitrogenated Air, EAN, EANx, NOAA Nitrox I or NOAA Nitrox II.
What are the main component gasses found in air, and what percentage of the total gas
mixture each gas represents? - Answer - How ever, unlike air which typically contains
about 79 percent nitrogen and 21 percent oxygen Nitrox contains a greater percentage
of oxygen.
What does term Nitrox mean? - Answer - Nitrox a mix of nitrogen and oxygen just like air.
What is the common term that divers use in describing a person who mixes the Nitrox to
fill the scuba cylinders? Answer -Blender
What are the common Nitrox mixes used by divers? Answer 22-40 percent mixture
-EAN32: 68 percent nitrogen, 32 percent oxygen.
-EAN36: 64 percent nitrogen, 36 percent oxygen.
What are the two major advantages that divers have when using Nitrox? - Answer -The
first is that you can increase your maximum allowable bottom time. This happens
because the extra oxygen added to your breathing gas when it was filled has displaced
nitrogen. Because there is less nitrogen in the mix to be absorbed by your body you can
spend longer at depth before you reach the nitrogen limit - which is the decompression
limit. Because you are absorbing less nitrogen on a given dive you can often shorten
your surface intervals.
State for how long, during any 24-hour period, you can be exposed to a Nitrox mixture at
its Maximum Operating Depth (MOD)? -Answer-Over a 24-hour period you will also have
a cumulative time limit for oxygen exposure at the maximum operating depth of two and
a half hours in any 24-hour period.
, How might a dive computer help prevent decompression sickness? Answer When you
make a dive using a dive computer, it will measure roughly how much nitrogen your
body has absorbed and alerts you when it is time for you to ascend and the rate at which
it is safest to ascend.
What might happen if you dive too deep or longer than you should?
- Answer -However, if you have had a very long dive, or you dove deep, the dive
computer will indicate that you must make a stop at a certain depth, in order for the
excess nitrogen in your body to have sufficient time to escape without problems. Your
computer may ask you to make one stop or a series of stops, commonly known as
decompression stops. What does the term decompression stop mean? -Answer -: Within
these stops the excess nitrogen in your body is circulated back into the lungs where you
exhaled each time you breathe.
What are three reasons why sport divers should avoid decompression diving?
-Answers-sport divers should avoid decompression dives by planning their dives with
their dive computers and closely monitoring their computers during their dives.
What is the main cause of decompression sickness? -Answer- Normally, decompression
sickness occurs when you have too much nitrogen in your body and you rise to the
surface too quickly. The nitrogen comes out of solution and creates a bubble thus
disrupting the flow of blood in that part of the body.
What are the most common symptoms of decompression sickness? -Answer -:
Symptoms include, but are not limited to, pain in the joints, numbness, paralysis, loss of
balance, muscle weakness, and impaired thinking.
What is the recommended first aid for decompression sickness? -Answer-First aid for
decompression sickness includes treating the diver for shock by laying them down and
keeping them either from being to cold or too warm. However the most important thing
to do is provide an injured diver pure oxygen as soon as possible and transport to a
hyperbaric chamber where proper recompression therapy can be performed.
What partial pressure of oxygen will allow a person to maintain consciousness at sea
