NAUI Open Water Certification Exam With Complete
Solutions Latest Update
SCUBA Acronym - ANSWER self-contained underwater breathing apparatus
equalizing mask pressure - ANSWER exhale small amount of air from nose into mask
Types of cylinders - ANSWER Aluminum - less durable but doesn't rust; store open
Steel - more durable but rusts when in contact with water; store with pressure
* have them inspected once a year
* US size shows volume of compressed air
* "+" indicates 10% pressure overfill
Cylinder valves - ANSWER K valve - most common; regulator and post tightened with
O-ring
DIN - large threaded opening; regulator screws into opening (is stronger at 200 bar
3000 psi)
Burst disks - ANSWER allows cylinder to vent excess pressure by bursting disk
Regulators - ANSWER Reduce high pressure of air to the surrounding environmental
pressure
i.e. the air you breathe is at body pressure
First stage - ANSWER - initially high pressure air reduced (10 bar above pressure
surrounding cylinder)
,- delivered to second stage through low pressure hose
- shall have one high pressure post (submersible pressure gauge is attached)
Second stage - ANSWER - further reduced air pressure
- attached to mouthpiece
Octopus Regulator - ANSWER - alternative air source
- allows to share air with another diver
Combo regulator + power inflator - ANSWER - donor uses alternate air source and other
diver gets primary
- eliminates need for extra hose
Contingency scuba - ANSWER - air source located in pony bottle
- must be located in front of body
Guages - ANSWER tells depth, bottom time, direction, air supply,
Submersible pressure gauge (SPG) - ANSWER Displays amount of air pressure
remaining in cylinder
Depth gauge - ANSWER - monitors water depth
capillary - shallow depths
bourbon - uses pressure to straighten curved metal tube
diaphragm - uses metal diaphragm attached to linkage
electronic - part of all dive computers/ dive timers
, Compass - ANSWER - must have lubber line (shows direction of travel)
- keep lubber line in line with center of body
- needle points magnetic north
to find shore: rotate lubber line to shore, mark needle point with index marks
reciprocal course - ANSWER outbound course is straight line and you make 180 degree
turn
Equipment maintanence - ANSWER - use dust cap over first stage inlet
- rinse with freshwater (DONT press purge button)
- transport with pressure at high altitudes
Watch - ANSWER - need a time device
- must withstand 300 ft and be able to elapse time
Dive computers - ANSWER measures:
bottom time
Max depth
dive time
remaining dive time
Buoyancy compensator (BC) - ANSWER - controls if you sink, float, hover
- controlled by adding or venting air
- types, back flotation, jacket style, horse collars,
-N
integrated weight system: no wight belt
Solutions Latest Update
SCUBA Acronym - ANSWER self-contained underwater breathing apparatus
equalizing mask pressure - ANSWER exhale small amount of air from nose into mask
Types of cylinders - ANSWER Aluminum - less durable but doesn't rust; store open
Steel - more durable but rusts when in contact with water; store with pressure
* have them inspected once a year
* US size shows volume of compressed air
* "+" indicates 10% pressure overfill
Cylinder valves - ANSWER K valve - most common; regulator and post tightened with
O-ring
DIN - large threaded opening; regulator screws into opening (is stronger at 200 bar
3000 psi)
Burst disks - ANSWER allows cylinder to vent excess pressure by bursting disk
Regulators - ANSWER Reduce high pressure of air to the surrounding environmental
pressure
i.e. the air you breathe is at body pressure
First stage - ANSWER - initially high pressure air reduced (10 bar above pressure
surrounding cylinder)
,- delivered to second stage through low pressure hose
- shall have one high pressure post (submersible pressure gauge is attached)
Second stage - ANSWER - further reduced air pressure
- attached to mouthpiece
Octopus Regulator - ANSWER - alternative air source
- allows to share air with another diver
Combo regulator + power inflator - ANSWER - donor uses alternate air source and other
diver gets primary
- eliminates need for extra hose
Contingency scuba - ANSWER - air source located in pony bottle
- must be located in front of body
Guages - ANSWER tells depth, bottom time, direction, air supply,
Submersible pressure gauge (SPG) - ANSWER Displays amount of air pressure
remaining in cylinder
Depth gauge - ANSWER - monitors water depth
capillary - shallow depths
bourbon - uses pressure to straighten curved metal tube
diaphragm - uses metal diaphragm attached to linkage
electronic - part of all dive computers/ dive timers
, Compass - ANSWER - must have lubber line (shows direction of travel)
- keep lubber line in line with center of body
- needle points magnetic north
to find shore: rotate lubber line to shore, mark needle point with index marks
reciprocal course - ANSWER outbound course is straight line and you make 180 degree
turn
Equipment maintanence - ANSWER - use dust cap over first stage inlet
- rinse with freshwater (DONT press purge button)
- transport with pressure at high altitudes
Watch - ANSWER - need a time device
- must withstand 300 ft and be able to elapse time
Dive computers - ANSWER measures:
bottom time
Max depth
dive time
remaining dive time
Buoyancy compensator (BC) - ANSWER - controls if you sink, float, hover
- controlled by adding or venting air
- types, back flotation, jacket style, horse collars,
-N
integrated weight system: no wight belt
