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Nitrox Certification Course Exam Graded A+
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Nitrox Certification Course Exam Graded A+
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Nitrox Certification Course Exam Graded A+Breathing 100% oxygen at 6 m/20 ft of sea water is the equivalent of breathing EAN32
at 40 m/132 ft of sea water in terms of oxygen partial pressure. - ANSWER-Facts
Central Nervous System (CNS) Oxygen Toxicity - ANSWER-all a diver must do is
violate the Maximum Operating Depth (MOD) for a particular mix causing the P02 to
rise above 1.6 and the chances for a CNS hit increase exponentially
Equipment risks associated with oxygen. - ANSWER-fire or explosion if not up to spec
O2 clean
Equivalent Air Depth(EAD) - ANSWER-a dive to depth on Nitrox is equivalent to a
making a dive of a shallower depth on air (less nitrogen gets absorbed by body, less
decompression obligation)(more oxygen available, dangerous to pass MOD)
How can a dive computer help you avoid decompression sickness? - ANSWER-it will
calculate approximately the amount of nitrogen absorbed by your body, and indicates
when it is time to ascend and the rate at which it is safest to ascend
How is nitrogen exposure similar to oxygen exposure? - ANSWER-exposure to higher
levels of oxygen at depth causes your body to become more sensitive to increased
levels of oxygen during subsequent dives
How long, in a single dive, can one be exposed to a Nitrox mixture at its maximum
operating depth(MOD) - ANSWER-the oxygen exposure time limit for a single dive is 45
minutes at a given maximum operating depth(MOD)
How long, in any 24-hour period, you can be exposed to a Nitrox mixture at its
maximum operating depth (MOD)? - ANSWER-you will have a cumulative time limit for
oxygen exposure at the maximum operating depth(MOD) of 2:30 hours in any 24-hour
period
Nitrox compatible diving equipment and its preparation. - ANSWER-if a regulator,
cylinder or valve will not be exposed to gas mixtures with an FO2 greater than 40
percent, at pressures greater than regulator intermediate pressure, they need not be O2
clean or service rated
Nitrox primary benefits - ANSWER-extend your bottom times and to shorten your
surface intervals significantly compared to your previous air-dives
Normal Air that we breathe is comprised of what % oxygen and nitrogen - ANSWER-
21% oxygen and 79% nitrogen
Pulmonary Oxygen Toxicity - ANSWER-can develop when you are exposed to elevated
levels of oxygen over long periods of time.
, Standard scuba air - ANSWER-although very clean and dry, still contains trace amounts
of hydrocarbons and other contaminants.
What are eight factors that may increase a divers susceptibility to oxygen toxicity? -
ANSWER--If you overheat during a dive.
-If you are an insulin dependent diabetic.
-If you suffer from a deficiency of Vitamin E.
-If you have an overactive thyroid (hyperthyroid) gland.
-If you dive without proper thermal protection in cold water.
-If you use drugs that may speed the onset of oxygen toxicity, such as adrenocortical
hormones, dextroamphetamine, epinephrine, norepinephrine, and paraquat.
-If you make a dive in which you are working or swimming hard underwater.
-If you have scar tissue in your lungs you may be more susceptible to oxygen poisoning.
What are five additional steps divers can take to help avoid oxygen toxicity while using
Nitrox? - ANSWER--Get medical clearance for diving if you are an insulin dependent
diabetic and if cleared to dive, restrict your diving to shallower depths.
-Get medical clearance for diving if you are taking any of the other drugs listed in this
chapter. If cleared to dive, restrict your diving to shallower depths.
-Avoid overheating.
-Wear adequate thermal protection while diving in cold water.
-Never dive with Nitrox deeper than the MOD for the mix you are using.
What are four things divers can do to help minimize the general risks associated with
Nitrox and other forms of diving? - ANSWER--Analyze and label every cylinder prior to
diving.
-Set the appropriate mix in your dive computer and do not exceed the limitations it gives
you during the dive.
-Never exceed a PO2 of 1.6.
-Avoid heavy exercise while diving with Nitrox.
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