Dive Master NAUI Exam with 100%
Correct Answers
What pressure will a scuba cylinder with a rated working pressure of 3000 psig (207
bar), be exposed to during a hydrostatic test? - ANS-5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders? -
ANS-Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require
cleaning by a process called: - ANS-Tumbling
Which of the following is considered proper care of a scuba cylinder? - ANS-Preventing
moisture from entering the cylinder.
Two cylinder valves in common use today are: - ANS-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? - ANS-Y valve
Which internal valve designs are available in the first stage of scuba regulators? - ANS-
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed to
operate the valve? - ANS-Balanced
Which regulator second stage design uses air pressure rather than mechanical leverage
to open the main valve? - ANS-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? - ANS-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. - ANS-high; low
Which diving instrument incorporates a Bourdon tube mechanism? - ANS-Cylinder
pressure gauges
, Two benefits derived from using an electronic dive computer are _____. - ANS-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 _____. - ANS-Water
has most likely entered the first stage
The best way to prevent overexertion is to _____. - ANS-Exercise, Swim regularly with
fins, Get in shape
Carbon monoxide levels in the blood are elevated by smoking cigarettes. - ANS-true
What is the term for a clinical condition that follows suffocation by submersion in liquid
after which there are at least 24 hours of survival? - ANS-Near Drowning
The onset of nitrogen narcosis is characterized by _____. - ANS-Impairment of thought
If the elimination of gas is not fast enough to match a diver's ascent, the excessive
supersaturation of gas in tissues may cause gas to come out of solution in the form of
bubbles. This malady is called _____. - ANS-Decompression sickness
What are the primary types of decompression sickness (DCS)? - ANS-Musculoskeletal;
Central Nervous System
To reverse a lower leg or foot cramp, _____. - ANS-Stretch the muscles and tendons by
pulling the tip of the fin toward the knee
A hood or tight seal can fool your carotid sinus baroreceptors into thinking that there is
high blood pressure by pushing on them. - ANS-True
Compressing your carotid arteries too much can make you _____. - ANS-Dizzy, or even
unconscious
Which malady is a result of pulmonary overinflation during ascent? - ANS-Arterial gas
embolism
Emergency treatment in the field for arterial gas embolism and decompression sickness
includes _____. - ANS-Having the victim breathe 100% oxygen, maintain basic life
support, treat for shock, initiate transport to a hospital with a hyperbaric chamber
Physical damage to the body resulting from a direct change in pressure is called _____.
- ANS-Barotrauma
Clinical Hypothermia occurs when the core temperature of the human body falls below
what temperature? - ANS-95 Fahrenheit (35 Celsius
Correct Answers
What pressure will a scuba cylinder with a rated working pressure of 3000 psig (207
bar), be exposed to during a hydrostatic test? - ANS-5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders? -
ANS-Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require
cleaning by a process called: - ANS-Tumbling
Which of the following is considered proper care of a scuba cylinder? - ANS-Preventing
moisture from entering the cylinder.
Two cylinder valves in common use today are: - ANS-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? - ANS-Y valve
Which internal valve designs are available in the first stage of scuba regulators? - ANS-
Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed to
operate the valve? - ANS-Balanced
Which regulator second stage design uses air pressure rather than mechanical leverage
to open the main valve? - ANS-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? - ANS-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. - ANS-high; low
Which diving instrument incorporates a Bourdon tube mechanism? - ANS-Cylinder
pressure gauges
, Two benefits derived from using an electronic dive computer are _____. - ANS-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 _____. - ANS-Water
has most likely entered the first stage
The best way to prevent overexertion is to _____. - ANS-Exercise, Swim regularly with
fins, Get in shape
Carbon monoxide levels in the blood are elevated by smoking cigarettes. - ANS-true
What is the term for a clinical condition that follows suffocation by submersion in liquid
after which there are at least 24 hours of survival? - ANS-Near Drowning
The onset of nitrogen narcosis is characterized by _____. - ANS-Impairment of thought
If the elimination of gas is not fast enough to match a diver's ascent, the excessive
supersaturation of gas in tissues may cause gas to come out of solution in the form of
bubbles. This malady is called _____. - ANS-Decompression sickness
What are the primary types of decompression sickness (DCS)? - ANS-Musculoskeletal;
Central Nervous System
To reverse a lower leg or foot cramp, _____. - ANS-Stretch the muscles and tendons by
pulling the tip of the fin toward the knee
A hood or tight seal can fool your carotid sinus baroreceptors into thinking that there is
high blood pressure by pushing on them. - ANS-True
Compressing your carotid arteries too much can make you _____. - ANS-Dizzy, or even
unconscious
Which malady is a result of pulmonary overinflation during ascent? - ANS-Arterial gas
embolism
Emergency treatment in the field for arterial gas embolism and decompression sickness
includes _____. - ANS-Having the victim breathe 100% oxygen, maintain basic life
support, treat for shock, initiate transport to a hospital with a hyperbaric chamber
Physical damage to the body resulting from a direct change in pressure is called _____.
- ANS-Barotrauma
Clinical Hypothermia occurs when the core temperature of the human body falls below
what temperature? - ANS-95 Fahrenheit (35 Celsius
