NAUI Master Diver Scuba Final UPDATED ACTUAL Questions
and CORRECT Answers
DIVE EQUIPMENT Open-circuit demand scuba is most True
commonly used by recreationals divers, closed-circuit
and semi-closed rebreathers now available
DO NOT GET MOISTURE INTO THE CYLINDER. Water will True
cause corrosion by combining with high pressure oxygen
inside the cylinder.
^^ Prolonged storage of air in a steel cylinder containing True
water can be bad. Oxidation process will consum some
of the oxygen in the air, leaving higher nitrogen
concentration
Always keep 300 psi of pressurized air in cylinder to True
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
Hydrostatic filled to 5000 psi or five thirds of the rated True
pressure of the cylinder, fill 300-500 psi per minute
, Standard on-off cylinder in usa is k-valve, low air warning True
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
dual valves like Y-valves or H-valves allow diver to mount True
two regulator systems on single cylinder for deep or
enclosed dives
First stage in regulators reduces cylinder pressure to True
intermediate or low pressure around 90-150 psi
Upstream valves rare, downstream more resistant to True
operate as cylinder prerssure decreases b/c failure in
closed position. Third valve is balanced valve
First stage includes diaphragm and piston. True
Intermediate pressure remains at a constant above True
ambient pressure as diver descends or acends
the main valve of a pilot valve regulator is opened and True
clsoed w/ air pressure rather than mechanical leverage
First stage coloring: green is corrosion, red is rust, black True
is carbon dust
Modern regulator performance is defined in terms of True
maximum resipiratory work level or breathing work
pressure gauges: surface cylinder pressure gauge to True
check air in a cylinder above water w/ bleed valve. and
sumbmersible
If water is visible in cylinder pressure gauge don't use it True
till repaired and tested
Open bourdon gauge least expensive but most problems true
w/ corrosion - the small one. sealed "" basically the same
but more protection. Oil filled "" oil filled case, avoid
leaving in sun due to leakage and expansion
two basic types of computers - tissue baed and table true
based. If a computer fails ascend w/ safety stop
air compressors operate under Boyles law - p and v True
and CORRECT Answers
DIVE EQUIPMENT Open-circuit demand scuba is most True
commonly used by recreationals divers, closed-circuit
and semi-closed rebreathers now available
DO NOT GET MOISTURE INTO THE CYLINDER. Water will True
cause corrosion by combining with high pressure oxygen
inside the cylinder.
^^ Prolonged storage of air in a steel cylinder containing True
water can be bad. Oxidation process will consum some
of the oxygen in the air, leaving higher nitrogen
concentration
Always keep 300 psi of pressurized air in cylinder to True
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
Hydrostatic filled to 5000 psi or five thirds of the rated True
pressure of the cylinder, fill 300-500 psi per minute
, Standard on-off cylinder in usa is k-valve, low air warning True
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
dual valves like Y-valves or H-valves allow diver to mount True
two regulator systems on single cylinder for deep or
enclosed dives
First stage in regulators reduces cylinder pressure to True
intermediate or low pressure around 90-150 psi
Upstream valves rare, downstream more resistant to True
operate as cylinder prerssure decreases b/c failure in
closed position. Third valve is balanced valve
First stage includes diaphragm and piston. True
Intermediate pressure remains at a constant above True
ambient pressure as diver descends or acends
the main valve of a pilot valve regulator is opened and True
clsoed w/ air pressure rather than mechanical leverage
First stage coloring: green is corrosion, red is rust, black True
is carbon dust
Modern regulator performance is defined in terms of True
maximum resipiratory work level or breathing work
pressure gauges: surface cylinder pressure gauge to True
check air in a cylinder above water w/ bleed valve. and
sumbmersible
If water is visible in cylinder pressure gauge don't use it True
till repaired and tested
Open bourdon gauge least expensive but most problems true
w/ corrosion - the small one. sealed "" basically the same
but more protection. Oil filled "" oil filled case, avoid
leaving in sun due to leakage and expansion
two basic types of computers - tissue baed and table true
based. If a computer fails ascend w/ safety stop
air compressors operate under Boyles law - p and v True
