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NAUI Master Diver Scuba Final with complete verified solutions 2024.
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NAUI Master Diver Scuba Final with complete verified solutions 2024.
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NAUI Master Diver Scuba Finalwith complete verified
solutions 2024
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
the main valve of a pilot valve regulator is opened and clsoed w/ air
pressure rather than mechanical leverage - answer True
First stage coloring: green is corrosion, red is rust, black is carbon
dust - answer True
Modern regulator performance is defined in terms of maximum
resipiratory work level or breathing work - answer True
pressure gauges: surface cylinder pressure gauge to check air in a
cylinder above water w/ bleed valve. and sumbmersible - answer
True
If water is visible in cylinder pressure gauge don't use it till repaired
and tested - answer True
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