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