Download NAUI INSTRUCTOR LATEST SCHOOL and more Exams Engineering in PDF only on Docsity!
END OF PAGE Sound travels how much faster in water than air? - ANSWERS- 4 times How many feet is one atmosphere of Sea vs Fresh water - ANSWERS- Sea - 33 Fresh - 34 What is gauge pressure plus atmospheric pressure? - ANSWERS- Absolute Pressure Pressure of nitrogen is balanced between the air and your body - ANSWERS-Equilibrium Snorkels over 15 inches are not recommended because - ANSWERS- Too much dead air space immediately upon reaching a dive site you should - ANSWERS-Observe conditions A divers inability to equalize ears during ascent could be - ANSWERS-a block or reverse block
SCHOOL EXAM
END OF PAGE What parameters should be established prior to every dive - ANSWERS- Max depth, max bottom time, min air A symptom of carbon monoxide poisoning is often: - ANSWERS- Headache The preferred action to take if you find yourself alone and out of air at 30 feet in open water is: - ANSWERS-Emergency swimming ascent (CESA) Because of refraction objects in water appear - ANSWERS-Larger Closer Skip breathing could cause - ANSWERS-Carbon dioxide excess The stage of the regulator which reduces tank pressure to intermediate pressure - ANSWERS-First Stage
SCHOOL EXAM
END OF PAGE If wearing an exposure suit you should do what as you descend to control buoyancy - ANSWERS-Add air to BCD Open heal fins are best for SCUBA because - ANSWERS-Wide variety of uses Currents that suddenly appear and disappear are - ANSWERS- Transitory and Surge Blood and mucus in the mask is most likely - ANSWERS-Sinus squeeze Rinsing a reg should be done - ANSWERS-Attached to a tank or with the dust cap on Gas law that explains most diving medical problems - ANSWERS- Boyles Law Two methods for measuring air pressure - ANSWERS-BAR PSI
SCHOOL EXAM
END OF PAGE Atmospheric pressure at sea level - ANSWERS- 1 BAR 14.7 PSI 1 ATA Weights are used by divers primarily to - ANSWERS-Offset positive buoyancy created by wetsuit Anchored boats should have - ANSWERS-Trail line 30 meters long with a buoy at the end Henry's Law - ANSWERS-The amount of gas dissolved in a liquid is directly related to its partial pressure above the liquid. Relationship of gas solubility and temperature - ANSWERS-Solubility of gas decreases with increasing temperature (INVERSELY RELATED) Inert gas loading in relation to body tissue - ANSWERS-Body tissue absorbs more inert gas as depth increases
SCHOOL EXAM
END OF PAGE NAUI recommendation for diving while pregnant - ANSWERS-Do not dive while pregnant Haldane tissue compartments - ANSWERS-Haldane - 5 compartments Modern Computers - Apx. 16 compartments Tissue compartment - ANSWERS-Mathematical model consisting of multiple theoretical tissues and their relative halftimes Fast compartments - short halftimes Slow compartments - long halftimes Ascent rate at altitude - ANSWERS-Slower than at sea level Extend dive times with gas by - ANSWERS-Decreased nitrogen and increased oxygen in breathing gas RNT - ANSWERS-Residual Nitrogen Time Tme already spent at the repetitive dive depth (dive tables)
SCHOOL EXAM
END OF PAGE Procedure for missed decompression stops - ANSWERS-Remain out of the water, rest, breathe 100% oxygen, drink fluids, be monitored for signs of decompression illness, transported to a hyperbaric facility if symptoms arise SIT - ANSWERS-Surface Interval Time Longer time at the surface allows for increased repeat dive times Canadian Dive Tables published by the Defense and Civil Institute of Environmental Medicine (DCIEM) - ANSWERS-Based on 20+ years of research pioneered by Kidd and Stubbs (1962) Swiss Dive Tables - ANSWERS-Developed by A.A. Bühlmann at the University of Zurich - EXTENDED TO INCLUDE ALTITUDE DIVING If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your Total Dive Time to exceed the Dive Time Limits, you should: - ANSWERS-Use the Maximum Dive Time as your Total Dive Time
SCHOOL EXAM
END OF PAGE Dives shallower than 40 ft are considered how deep on NAUI Dive Tables - ANSWERS-40 ft How long after diving should you wait to fly - ANSWERS- 24 hrs Can NAUI Dive Tables be applied for decompression of an altitude dive? - ANSWERS-No Who created the RGBM Tables - ANSWERS-Bruce R. Wienke Repetitive Dives must be - ANSWERS-Shallower than the previous dive Minimun SIT for RGBM tables - ANSWERS-One hour NAUI Safety Stop - ANSWERS- 15 fsw (4.5 msw)/3 minutes RGBM Sea Level Tables can be used up to what altitude - ANSWERS- 2000 ft (610 meters)
SCHOOL EXAM
END OF PAGE RGBM Table Options - ANSWERS- 0 - 2000 ft 2000 - 6000 ft 6000 - 10000 ft Due to the difference in density of fresh water and ocean water, divers should adjust their ballast weight by adding or subtracting - ANSWERS- About 2.5% of the combined weight of their dive gear and body weight Lubber line - ANSWERS-Indicates the course or bearing the user will follow Stationary reference line on compass Basic types of compass - ANSWERS-Direct and Indirect reading Marking a surface position is done by - ANSWERS-Establishing a "fix" with a set of bearings or ranges Niche - ANSWERS-The position each species occupies in it habitat
SCHOOL EXAM
END OF PAGE First step in searching for an object under water - ANSWERS-Define the search area Two types of lift bags - ANSWERS-Open bottom & Pillow Where tidal currents are significant, diving from shore should generally be conducted at or near high or low tide because: - ANSWERS-There is a little tidal current near slack tide Trimix - ANSWERS- 2 inert gasses & oxygen Wavelength - ANSWERS-Distance from Crest to Crest of waves Cause of tides - ANSWERS-Gravitational pull of the moon 3 Tide cycles - ANSWERS-Diurnal - 1 high 1 low per day Semidiurnal - 2 high 2 low of equal sizes per day Mixed - 2 high 2 low of differing sizes per day
SCHOOL EXAM
END OF PAGE Current parralell to the beach - ANSWERS-Longshore Current Primary cause of offshore currents - ANSWERS-Wind The horizontal boundary between waters of different salinity - ANSWERS-Halocline Most common plants in the ocean - ANSWERS-Phytoplankton Most common toxic poisoning in ocean fish - ANSWERS-Ciguatera Waves caused by the wind increase in size with the wind velocity, duration, and: - ANSWERS-Fetch Because of the Coriolis force, major ocean currents tend to flow: - ANSWERS-Clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere
SCHOOL EXAM
END OF PAGE Epilimnion - ANSWERS-Sun-warmed waters of lakes and quarries form an upper layer of water during the summer What causes higher than normal spring tides - ANSWERS-When the solar tide reinforces and amplifies the lunar tide Beaufort Scale - ANSWERS-Scale for measuring wind force/speed When waves move into shallow water: - ANSWERS-The wave velocity decreases and the wavelength decreases Slack tide - ANSWERS-The period of change in a tidal current from a flood tide to an ebb tide (or an ebb tide to a flood tide) The terms "set" and "drift" refer to a current's: - ANSWERS-Direction and velocity Modern Cylinders - ANSWERS-Steel or Aluminum
SCHOOL EXAM
END OF PAGE Internal valve types for first stages - ANSWERS-Diaphragm & Pistol Most common SPG - ANSWERS-Sealed Bourdon Tube Two most common computer models - ANSWERS-Tissue & Table based Two Stage regulator - ANSWERS-Reg reduced cylinder pressure to ambient pressure in two steps Purpose of a Hydrostatic test - ANSWERS-To determine permanent expansion of a cylinder Modern regulator performance is defined in terms of - ANSWERS-Max respiratory work level Alpha flag represents - ANSWERS-A vessel restricted in its ability to maneuver
SCHOOL EXAM
END OF PAGE Where does gas exchange occur in the body - ANSWERS-Alveolar- capillary membrane Two main benefits to Nitrox - ANSWERS-Longer dive times & Shorter SIT Inert gas means - ANSWERS-Our bodies do not use the gas Daltons Law - ANSWERS-The partial pressure of any gas in a mixture is directly related to the fraction of the gas in the total mixture Central Nervous System (CNS) Oxygen Toxicity results from: - ANSWERS-Relatively short exposures to high oxygen partial pressures ConVENTID (oxygen poisoning) - ANSWERS-Convulsions Vision (blurriness) Ears (ringing) Nausea Twitching
SCHOOL EXAM
END OF PAGE Irritability Dizziness The maximum contingency partial pressure of oxygen (PO2) for diving nitrox is - ANSWERS-1.6 ATA MOD - ANSWERS-Maximum Operating Depth - calculated by the partial pressure of oxygen Nitrox mixing methods - ANSWERS-Partial pressure blending Nitrogen separating membrane Continuous gas blending An oxygen analyzer should display oxygen content to an accuracy of: - ANSWERS-1/10 of a percent Kelvin scale - ANSWERS-Absolute temperature scale based on the Celsius scale
SCHOOL EXAM
