NAUI Master Diver Scuba Final QUESTIONS & ANSWERS!!
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Course
Naui scuba
Institution
Naui Scuba
DIVE EQUIPMENT Open-circuit demand scuba is most commonly used by recreationals divers, closed-circuit and semi-closed rebreathers now available - ANSWER True
DO NOT GET MOISTURE INTO THE CYLINDER. Water will cause corrosion by combining with high pressure oxygen inside the cylinder. - ANSWER Tr...
NAUI Master Diver Scuba Final
QUESTIONS & ANSWERS!!
DIVE EQUIPMENT Open-circuit demand scuba is most commonly used by recreationals divers, closed-
circuit and semi-closed rebreathers now available - ANSWER True
DO NOT GET MOISTURE INTO THE CYLINDER. Water will cause corrosion by combining with high
pressure oxygen inside the cylinder. - ANSWER True
^^ Prolonged storage of air in a steel cylinder containing water can be bad. Oxidation process will
consum some of the oxygen in the air, leaving higher nitrogen concentration - ANSWER True
Always keep 300 psi of pressurized air in cylinder to prevent moisture accum. Bad if slosh heard, whitish
mist or odor. IF COROSSION IN CYLINDER THIS CAN BE CLEANED BY TUMBLING - so fill it with aluminum
oxide chips or abrasive materials and rotate for many hours removing rust - ANSWER True
Hydrostatic filled to 5000 psi or five thirds of the rated pressure of the cylinder, fill 300-500 psi per
minute - ANSWER True
Standard on-off cylinder in usa is k-valve, low air warning mech. is j-valve (two sides). This valve lever
should be fully up to reserve air if they forget or if diving eliminates that can be turned down but air will
release quick without warning - ANSWER True
dual valves like Y-valves or H-valves allow diver to mount two regulator systems on single cylinder for
deep or enclosed dives - ANSWER True
First stage in regulators reduces cylinder pressure to intermediate or low pressure around 90-150 psi -
ANSWER True
Upstream valves rare, downstream more resistant to operate as cylinder prerssure decreases b/c failure
in closed position. Third valve is balanced valve - ANSWER True
, First stage includes diaphragm and piston. - ANSWER True
Intermediate pressure remains at a constant above ambient pressure as diver descends or acends -
ANSWER True
currents are waves approaching shore at an angle that flows parallel to shore. Longshore currents move
you down the beach, can often be detected. Four types of rip currents: permanent, fixed, flash, traveling.
The set and drift of a current refer to currents directions and velocity. Always begin a dive against a
current unless trained - ANSWER True
DIVING PHYSICS - Rankine scale absolute zero is -459.67 F...Density is mass per unit volume or m/v.
Archimedes Principle - an object wholle or partially immersed in a fluid is buoyed up by a force equal to
weight of fluid displaced, and ocean water is 2.5% denser than fresh water so more buoyant.... Absolute
pressure = depth of water/depth definition of 1 atm + 1 atm....Daltons law the whole is equal to the sum
of the parts, like partial pressure: Ptotal= P1 + P2 + P3. Boyles law volume of gas inversely proportional
to pressure. P1V1=P2V2 this may include squeezes, equalization of air spaces, reverse blocks, and lung
rupture injuries. Charles law volume of gas proportional to absolute temp. V1/T1 = V2/T2. General gas
P1V1/T1 = "" - ANSWER True
Objects in maask appear larger 4/3rds and closer. In water sound travels four times faster which makes it
hard to determine location. Heat transferred by conduction, convection, or radiation - ANSWER True
DIVING PHYSIOLOGY - near drowning is drowning w/ at least 24 hrs of survival, drowning is death within
24 hours. Narcosis is from breathing nitrogen gas under pressure, drunk. Decompression sickness/DCS if
stay too long or ascend too quick bubbles in body nitrogen. Limb bends is joint pain commonly due to
DCS. Neurolical bends "". Skin bends itchy, inner ear bends vertigo, chokes is pulmonary DCS usually
from flying blocks circulation to lungs. FIRST AID: 100% O2, transport to nearest chamber. Air embolism
is bubbles scaping alveoli and block heart, brain, etc. Hypothermia is temp below 95F. Vertigo ear drum
equalization cold air rushes into middle earpressure change. Don't dive while pregnant. - ANSWER True
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