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NAUI Nitrox Diver Exam (New 2024/ 2025
Update) Questions and Verified Answers|
100% Correct| A Grade
QUESTION
one of the factors that can increase susceptibility to CNS oxygen toxicity is Answer: heavy exercise and carbon dioxide buildup
QUESTION
the acronym used to remember signs and symptoms of oxygen toxicity is Answer: ConVENTID
QUESTION
the recommended maximum PO2 for enriched air nitrox diving is Answer: 1.4 ata
QUESTION
the first precursor symptom of CNS oxygen toxicity is Answer: precursor symptoms are highly variable
QUESTION
a stuporous condition characterized by impaired mental and physical performance and changes in mood and behavior is known as Answer: nitrogen narcosis
QUESTION
the two most commonly used nitrox mixtures, also known as NOAA Nitrox I and NOAA Nitrox II are Answer: 32% and 36% oxygen
QUESTION
the maximum operating depth (MOD) of a gas mix is determined by Answer: the maximum acceptable partial pressure of oxygen
QUESTION
calculate the normal maximum operating depth for EAN32 (PO2 = 1.4 ata) Answer: 34 msw (111 fsw)
QUESTION
what is the "best mix" (not to exceed 40% O2) to use for an oxygen partial pressure limit of 1. ata on a dive to 27 msw (90 fsw) Answer: EAN
Answer: 47 minutes
QUESTION
NAUI Nitrox dive tables have a gas-mix tolerance of Answer: plus or minus 1%
QUESTION
standard NAUI dive tables can be used up to altitudes of about Answer: 300 meters (1000 feet)
QUESTION
NAUI RGBM sea level dive tables can be used for altitudes up to Answer: 610 meters (2000 feet)
QUESTION
NAUI Nitrox dive tables and NAUI RGBM Nitrox dive tables are available for Answer: EAN32 and EAN
QUESTION
what is the equivalent depth for a 23 msw (75 fsw) dive using EAN
Answer: 18 msw (60 fsw)
QUESTION
dive computers offer the advantage of giving the diver Answer: "credit" for the shallow portions of the dive
QUESTION
the rule of halves is Answer: for any no-decompression dive, end the dive with a 2.5 minute stop at a depth that is half the deepest depth of the dive, followed by a one-minute stop at 3-6 meters (10-20 feet)
QUESTION
NAUI has chose to use the _____ dive tables as the basis for its standard EAN32 and EAN dive tables Answer: US Navy
QUESTION
the required surface interval between two separate dives is _____; the recommended minimum surface interval is ______ Answer: 10 minutes; 1 hour
1.3 ata
QUESTION
if the oxygen partial pressure in your mix is 1.3 ata at a depth of 37 msw (122 fsw), what is the fraction of oxygen in the mix? Answer:
QUESTION
what is the partial pressure of oxygen in air at a depth of 21 msw (69 fsw)? Answer: 0.65 ata
QUESTION
the symptoms of nitrogen narcosis parallel those often seen in Answer: alcohol intoxication
QUESTION
____ law states: "at a constant temperature, the volume of a gas varies inversely with absolute pressure, while the density of a gas varies directly with absolute pressure." Answer: Boyle's
QUESTION
each 10 meters (33 feet) that you descend in the ocean adds another atmosphere of pressure to the one atmosphere of surface pressure Answer: true
QUESTION
a diver suffering from nitrogen narcosis will always be aware that he is impaired Answer: false
QUESTION
the mechanisms of nitrogen narcosis are thought to be similar to Answer: anesthesia
QUESTION
the controlled release of pressure during ascent from a scuba dive is Answer: decompression
QUESTION
which gas in air is essential to sustain life? Answer: oxygen
QUESTION
all components of the ____ are required for a fire to take place Answer: fire triangle
QUESTION
any equipment that is used with pure oxygen or an oxygen level above ____ must be cleaned for oxygen service Answer: 40%
QUESTION
cylinders and tank valves to be used with enriched air must be cleaned and ____ lubricants used Answer: oxygen-compatible
QUESTION
even though you will not be using nitrox mixtures above 40% oxygen, your cylinder should be oxygen cleaned and identified as a nitrox cylinder because Answer: it may be subjected to pure oxygen at elevated pressures when it is filled
QUESTION
in _______ mixing, a measured pressure of oxygen is added to a cylinder, which is then filled to service pressure with air
Answer: partial pressure
QUESTION
the ____ method injects a measured flow of pure oxygen into the air before it reaches the intake of the compressor Answer: continuous-flow
QUESTION
______ uses a material called a molecular sieve that selectively adsorbs a thin layer of nitrogen from the air that passes over or through it Answer: pressure swing absorption
QUESTION
_______ uses a semi-permeable membrane that allows oxygen to flow through it more readily than nitrogen Answer: membrane separation
QUESTION
an essential operation in using an oxygen analyzer is Answer: calibrating it
QUESTION
the ______ in the air you are breathing limits the time you can stay at depth Answer: nitrogen
QUESTION
in the early twentieth century, a quantitative model for nitrogen loading and dive tables were developed by Answer: John Scott Haldane
QUESTION
we say that nitrogen is an inert gas. this means Answer: our bodies do not use the nitrogen we breathe
QUESTION
credit for developing and introducing nitrox diving techniques for standard scuba goes to Answer: Dr. Morgan Wells
QUESTION
NAUI sanctioned enriched air nitrox training in
Answer: 1992
QUESTION
two benefits of diving with nitrox are Answer: longer dive times and shorter surface intervals
QUESTION
what does the "x" stand for in the term EANx? Answer: the percentage of oxygen in the mix
QUESTION
in 1878, Paul Bert established that_____, liberated as bubbles following sudden decompression was the cause of decompression sickeness Answer: nitrogen
QUESTION
nitrox is a _____ breathing gas Answer: mid-range
QUESTION
nitrox provides the greatest advantages for dives in the _____ depth range
