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NAUI Nitrox Exam Prep (New 2024/ 2025
Update) Questions and Verified Answers|
100% Correct| A Grade
QUESTION
The Signs and Symptoms of DCS Do Not Vary and Can Be Easily Identified No Matter The Injury or Severity of The Case (T/F) Answer: False
QUESTION
Central nervous system toxicity Answer: CNS toxicity can result from relatively short exposures to high partial pressures of oxygen.
QUESTION
The other type is called pulmonary toxicity or whole body toxicity Answer: Pulmonary toxicity results from prolonged exposure to elevated partial pressures of oxygen (above about 0.5 atmosphere). As the name implies, its most pronounced effects are on the lungs, producing signs and symptoms such as chest tightness, breathing discomfort and pain, shortness of breath, and coughing. Development of pulmonary toxicity requires long-term exposures such as encountered in saturation diving, certain military and commercial diving, or recompression chamber treatment.
QUESTION
Pulmonary toxicity is not a concern of the recreational nitrox diver; CNS toxicity is a concern.
Answer:
QUESTION
Using the NOAA Oxygen Exposure limits the 24 hour limit at the maximum recreational partial pressure of oxygen (PPO2) is 200 minutes (T/F) Answer: False
QUESTION
Match each statement True or False: Answer: The mechanisms of nitrogen narcosis are thought to be similar to Anethesia: True A diver suffering from nitrogen narcosis will always be aware that he/she is impaired: False Argon in air is essential to sustain life: False The primary waste product from the metabolism of oxygen is Carbon dioxide: True A stuporous condition characterized by impaired mental and physical performance and changes in mood and behavior is known as nitrogen narcosis: True
QUESTION
For most persons, symptoms of hypoxia begin to appear when the PO
Answer: Falls below about 0.16 ata
QUESTION
The acronym used to remember signs and symptoms of oxygen toxicity is:
Answer:
QUESTION
Metric: step 1: 1.4 ppo2 / 0.36 Fo2 = 3.88 ATA step 2: (3.88ATA-1)10msw=28.88msw Rounding to safety=28.8msw Answer: Single-step calculation: {(1.4 ppo2 / .36 fo2)-1}10msw = 28.88msw** Rounding to safety=28.8msw
QUESTION
Imperial: step 1: 1.4 ppo2 / 0.36 Fo2 = 3.88 ATA step 2: (3.88ATA-1)33fsw=95.33fsw Rounding to safety=95fsw Answer: Single-step calculation: ((1.4 ppo2 / .36 fo2)-1)33fsw = 95.333 =95fsw** Rounding to safety=95fsw
QUESTION
Finding the best mix: Example: you have a target depth of 28msw (95fsw): Answer:
QUESTION
step 1: (28msw / 10msw) + 1ATM = 3.8 ATA step 2: 1.4ppo2 / 3.8ATA =0.368 fO2** rounding to safety=36% O Answer: Single-step calculation: (1.4 ppo2 /{(28msw/10msw)+1atm}) = 0.368fO2** rounding to safety=36% O
QUESTION
step 1: (95fsw / 33fsw) + 1 ATM = 3.88 ATA step 2: 1.4 ppo2 / 3.88 ATA = 0.3608 Fo rounding to safety=36% O Answer: Single-step calculation: (1.4 ppo2 /(95fsw/33fsw)+1atm) = 0.3608 fO2** rounding to safety=36% O
QUESTION
Match the term to its definition Answer: The maximum operating depth (MOD) of a gas mix is determined by: The maximum acceptable partial pressure of oxygen Best Mix: Is the highest percentage of oxygen that can be used at a partial pressure of 1.4 at the planned dive depth 32% and 36% oxygen: The two most commonly used nitrox mixtures, also known as NOAA Nitrox I and NOAA Nitrox II, are.
QUESTION
Henry's Law Answer: The amount of any given gas that will dissolve in a liquid at a given temperature is a function of the partial pressure of the gas that is in contact with the liquid and the solubility coefficient of the gas in the particular liquid."
QUESTION
Henry's Law addresses the quantity of a gas that will dissolve, and describes the rate at which the gas will dissolve (T/F) Answer: False, it does not describe the rate at which gas disolves
QUESTION
Dalton Law States Answer: The total pressure exerted by a mixture of gases is equal to the sum of the pressures that would be exerted by each of the gases if it alone were present and occupied the volume.
QUESTION
According to Daltons law, the pressure exerted by each gas mixture will add up to the total pressure of gas (T/F) Answer: True
QUESTION
Converting between depth and pressure by formula (Metric)
Answer: P barabsolute = (D msw / 10 msw/bar ) + 1 bar = [(D msw + 10 msw) / 10msw/bar] P= absolute pressure (ATA)D= Depth in meters Converting absolute pressure to depth is the reverse: D msw = (P barabsolute - 1 bar) x 10 msw/bar
QUESTION
Converting between depth and pressure by formula (Imperial) Answer: P ata = (D fsw / 33 fsw/atm) + 1 atm = {(D fsw + 33 fsw) / 33 fsw/atm} P= absolute pressure (ATA)D= Depth in feet Converting absolute pressure to depth is the reverse: D fsw = (P ata - 1 atm) x 33 fsw/atm
QUESTION
Partial Pressure formula (If you know the partial pressure and the total pressure) Answer: Fg = Pg/Ptotal
QUESTION
Partial Pressure formula (If you know the partial pressure and fraction/percentage of the gas) Answer: Ptotal = Pg/Fg
QUESTION
Using diving terms, partial pressure is calculated as: partial pressure = (total absolute pressure) × (volume fraction of gas component) For the component gas "i": pi = P × F.
QUESTION
The Oxygen Partial Pressure (PO2) in EAN35 at a depth of 26 msw (85 fsw) is Answer: 1.3 ata
QUESTION
The absolute pressure at 17 msw (56 fsw) is Answer: 2.7 ata
QUESTION
What is the partial pressure of oxygen in the air at a depth of 21 msw (69 fsw) Answer: .
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
At one atmosphere absolute there is 79% nitrogen or a partial pressure of 0.79 nitrogen as a diver descends the percentage of gas doesnt change but the partial pressure of the gas will increase with increased pressure (T/F)
Answer: True
QUESTION
NAUI Dive tables can be used from sea level to an altitude of 300m (1000ft), NAUI RGBM from sea level 610m (2000ft) for altitudes beyond that divers should use altitude dive tables (T/F) Answer: True
QUESTION
All RGBM dives should have a 3-minute safety stop at 5msw (15 fsw) (T/F) Answer: True
QUESTION
Equivalent Air Calculations (EAN32 to a depth of 24.2 meters (80 feet)? Answer:
QUESTION
Metric tep 1: (24.2msw/10msw)+1atm=3.42ata Step 2: {(1.0-0.32) / 0.79 } * 3.42ata = 2.94ata Step 3: (2.94 ata - 1 atm) * 10msw = 19.4msw EAD Rounding to safety=21msw EAD for a dive table
Standard NAUI Dive Tables can be used up to altitudes of about: 300 meters (1000 feet) NAUI RGBM sea level dive tables can be used for altitudes up to 610 meters (2000 feet)
QUESTION
What is the equivalent air 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 required surface interval between two separate dives using the standard NAUI tables is ____________; the recommended minimum surface interval is _______________________. However, if you are using the NAUI RGBM Dive Tables, a minimum surface interval of __________________ is required Answer: 10 minutes, 1 hour, 1 hour
QUESTION
Rule of halves is: Answer: For any no-decompression dive, end the dive with a two to three 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
Oxygen is an explosive and flammable gas, for a fire to start you only need oxygen and a heat source (T/F) Answer: False
QUESTION
The 40% rule is based on published, peer-reviewed research and is a definitive industry standard (T/F) Answer: False
QUESTION
Any equipment that is going to be exposed to a gas that contains greater than 40% oxygen must be oxygen cleaned and free of hydrocarbons (T/F) Answer: True
QUESTION
It is your responsibility to know what breathing mixture is in your cylinder and to maintain your equipment in a safe manner for use with nitrox (T/F) Answer: True
QUESTION
Pair the methods of making nitrox with their definition
Answer: 40%, 40%, It may be subjected to pure oxygen at elevated pressures when it is filled
QUESTION
Nitrox analyzers never need maintenance or to be calibrated (T/F) Answer: False
QUESTION
When analyzing a nitrox blend the ___________ must be the same as when the unit was calibrated with air Answer: flow rate
QUESTION
After the gas is analyzed and the cylinder is labeled, the diver must Answer: Document the fill by completing an entry in the fill log
QUESTION
Final gas analysis and recording the pertinent information in a fill log and on the cylinder is the responsibility of the __________________ Answer: end user
QUESTION
Place the steps for calibrating in the correct order Answer: Ask for help if you are not familiar with the analyzer Calibrate the analyzer to a known source following proper protocol Open the cylinder to be analyzed and establish the correct flow rate for the analyzer being used label the cylinder fill out the Nitrox log book
QUESTION
Air Answer: 78% Nitrogen, 21% Oxygen
QUESTION
What is Nitrox Answer: Gas mixture with less Nitrogen (usually more Oxygen)
QUESTION
Nitrox other names Answer: Oxygen enriched air, Enriched air nitrox, Nitrox, EANx.
QUESTION
QUESTION
All of these terms refer to the same breathing mixture (T/F)
- EAN
- NOAA Nitrox II
- Nitrox 36%
- 36% Oxygen Mixture Answer:
QUESTION
Nitrox is a ____________ breathing gas Answer: Mid Range
QUESTION
In _____, Paul Bert established that ___________, liberated as bubbles following sudden decompression was the cause of decompression sickness. Answer: 1878, Nitrogen
QUESTION
Nitrox provides the greatest advantages for dives in the __________________ depth ranges Answer: 15 - 33m (50-110 ft)
