Dive Master NAUI (2025-2026) Test
Exam with Correct Verified and Well
Analyzed Answers Graded A+
What pressure will a scuba cylinder with a rated working pressure of
3000 psig (207 bar), be exposed to during a hydrostatic test?
5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of
scuba cylinders?
Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba
cylinder, it may require cleaning by a process called:
Tumbling
Which of the following is considered proper care of a scuba cylinder?
Preventing moisture from entering the cylinder.
Two-cylinder valves in common use today are:
The K-valve and DIN valve.
Which valve is an example of a special scuba valve that is required for
certain types of specialty diving such as deep diving with a single
cylinder?
Y valve
Which internal valve designs are available in the first stage of scuba
regulators?
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the
force needed to operate the valve?
Balanced
, Which regulator second stage design uses air pressure rather than
mechanical leverage to open the main valve?
Pilot
In the event of a regulator first stage malfunction, which type of valve
design would be likely to eliminate air flow to the diver?
Upstream
When considering a regulator for purchase or use, an important point
to remember is that certain regulators may not be capable of
delivering ______ flow rates at ______ cylinder pressure during an air
sharing emergency.
high; low
Which diving instrument incorporates a Bourdon tube mechanism?
Cylinder pressure gauges
Two benefits derived from using an electronic dive computer are
_____.
Accurate monitoring of ascent rate and, if executing a multi-level
diving profile, avoidance of the maximum time/depth penalty
Green discoloration on the first stage of a scuba regulator indicates
_____.
Water has most likely entered the first stage
An air compressor used for filling scuba cylinders operates by the
principle of _____.
Boyle's Law
Dry suits form a waterproof barrier, but require undergarments to be
effective in cold water
True
In order to make an informed decision on equipment purchase, you
need to have a solid educational background concerning the _____ of
diving equipment:
Types, Method of operation, Care and maintenance
The distance between successive wave crests is defined as _____.
Wavelength
Exam with Correct Verified and Well
Analyzed Answers Graded A+
What pressure will a scuba cylinder with a rated working pressure of
3000 psig (207 bar), be exposed to during a hydrostatic test?
5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of
scuba cylinders?
Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba
cylinder, it may require cleaning by a process called:
Tumbling
Which of the following is considered proper care of a scuba cylinder?
Preventing moisture from entering the cylinder.
Two-cylinder valves in common use today are:
The K-valve and DIN valve.
Which valve is an example of a special scuba valve that is required for
certain types of specialty diving such as deep diving with a single
cylinder?
Y valve
Which internal valve designs are available in the first stage of scuba
regulators?
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the
force needed to operate the valve?
Balanced
, Which regulator second stage design uses air pressure rather than
mechanical leverage to open the main valve?
Pilot
In the event of a regulator first stage malfunction, which type of valve
design would be likely to eliminate air flow to the diver?
Upstream
When considering a regulator for purchase or use, an important point
to remember is that certain regulators may not be capable of
delivering ______ flow rates at ______ cylinder pressure during an air
sharing emergency.
high; low
Which diving instrument incorporates a Bourdon tube mechanism?
Cylinder pressure gauges
Two benefits derived from using an electronic dive computer are
_____.
Accurate monitoring of ascent rate and, if executing a multi-level
diving profile, avoidance of the maximum time/depth penalty
Green discoloration on the first stage of a scuba regulator indicates
_____.
Water has most likely entered the first stage
An air compressor used for filling scuba cylinders operates by the
principle of _____.
Boyle's Law
Dry suits form a waterproof barrier, but require undergarments to be
effective in cold water
True
In order to make an informed decision on equipment purchase, you
need to have a solid educational background concerning the _____ of
diving equipment:
Types, Method of operation, Care and maintenance
The distance between successive wave crests is defined as _____.
Wavelength
