NAUI Master Scuba Diver Exam
Questions and Answers
what pressure will a scuba cylinder with a rated working pressure of 3000 psi (207 bar)
be exposed to during a hydrostatic test? - ANSWER-5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders? -
ANSWER-permanent expansion
if a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require
cleaning by a process called - ANSWER-tumbling
which of the following is considered proper care of a scuba cylinder? - ANSWER-
preventing moisture from entering the cylinder
two cylinder valves in common use today are - ANSWER-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? - ANSWER-y valve
which internal valve designs are available in the first stage of scuba regulators? -
ANSWER-piston; diaphragm
which valve is unaffected by cylinder air pressure with regard to the force needed to
operate the valve? - ANSWER-balanced
which regulator second stage design uses air pressure rather than mechanical leverage
to open the main valve? - ANSWER-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? - ANSWER-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 - ANSWER-high; low
which diving instrument incorporates a Bourdon tube mechanism? - ANSWER-cylinder
pressure gauges
, two benefits derived from using an electronic dive computer are - ANSWER-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 - ANSWER-water
has most likely entered the first stage
an air compressor used for filling scuba cylinders operates by the principle of -
ANSWER-Boyle's Law
dry suits form a waterproof barrier, but require undergarments to be effective in cold
water - ANSWER-true
in order to make an informed decision on equipment purchase, you need to have a solid
educational background concerning the ____ of diving equipment - ANSWER-types,
method of operation, care and maintenance
the distance between successive wave crests is defined as - ANSWER-wavelength
the highest tides are called ____ tides, and the lowest tides are called ____ tides -
ANSWER-spring; neap
water rocking back and forth in a lake or a bay is defined as - ANSWER-seiching
the effect of the moon on tidal action is about - ANSWER-twice the effect of the sun
the type of breaking wave that produces the greatest force when breaking is the _____
breaker - ANSWER-plunging
if the water conditions are reasonable to make a beach dive, all of the following
procedures are suggested except - ANSWER-entering the water as slowly as possible
immediately after a wave breaks, getting beyond the surf zone quickly, before the next
wave breaks
when waves break on shore and the backrush is funneled through a narrow opening,
the condition is known as - ANSWER-a rip current
currents in bodies of water are formed by - ANSWER-surface winds, the rotation of the
earth, the influence of the sun and moon
water of equal temperature at all levels is most likely to be found in a lake during -
ANSWER-spring
the horizontal boundary between waters of differing salinity is defined as a - ANSWER-
halocline
Questions and Answers
what pressure will a scuba cylinder with a rated working pressure of 3000 psi (207 bar)
be exposed to during a hydrostatic test? - ANSWER-5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders? -
ANSWER-permanent expansion
if a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require
cleaning by a process called - ANSWER-tumbling
which of the following is considered proper care of a scuba cylinder? - ANSWER-
preventing moisture from entering the cylinder
two cylinder valves in common use today are - ANSWER-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? - ANSWER-y valve
which internal valve designs are available in the first stage of scuba regulators? -
ANSWER-piston; diaphragm
which valve is unaffected by cylinder air pressure with regard to the force needed to
operate the valve? - ANSWER-balanced
which regulator second stage design uses air pressure rather than mechanical leverage
to open the main valve? - ANSWER-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? - ANSWER-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 - ANSWER-high; low
which diving instrument incorporates a Bourdon tube mechanism? - ANSWER-cylinder
pressure gauges
, two benefits derived from using an electronic dive computer are - ANSWER-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 - ANSWER-water
has most likely entered the first stage
an air compressor used for filling scuba cylinders operates by the principle of -
ANSWER-Boyle's Law
dry suits form a waterproof barrier, but require undergarments to be effective in cold
water - ANSWER-true
in order to make an informed decision on equipment purchase, you need to have a solid
educational background concerning the ____ of diving equipment - ANSWER-types,
method of operation, care and maintenance
the distance between successive wave crests is defined as - ANSWER-wavelength
the highest tides are called ____ tides, and the lowest tides are called ____ tides -
ANSWER-spring; neap
water rocking back and forth in a lake or a bay is defined as - ANSWER-seiching
the effect of the moon on tidal action is about - ANSWER-twice the effect of the sun
the type of breaking wave that produces the greatest force when breaking is the _____
breaker - ANSWER-plunging
if the water conditions are reasonable to make a beach dive, all of the following
procedures are suggested except - ANSWER-entering the water as slowly as possible
immediately after a wave breaks, getting beyond the surf zone quickly, before the next
wave breaks
when waves break on shore and the backrush is funneled through a narrow opening,
the condition is known as - ANSWER-a rip current
currents in bodies of water are formed by - ANSWER-surface winds, the rotation of the
earth, the influence of the sun and moon
water of equal temperature at all levels is most likely to be found in a lake during -
ANSWER-spring
the horizontal boundary between waters of differing salinity is defined as a - ANSWER-
halocline
