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 visu...
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
An air compressor used for filling scuba cylinders operates by the principle of _____. - ANS
Boyle's Law
Dry suits form a waterproof barrier, but require undergarments to be effective in cold water -
ANS True
In order to make an informed decision on equipment purchase, you need to have a solid
educational background concerning the _____ of diving equipment: - ANS Types, Method
of operation, Care and maintenance
The distance between successive wave crests is defined as _____. - ANS Wavelength
The highest tides are called _____ tides, and the lowest tides are called _____ tides. - ANS
spring; neap
Water rocking back and forth in a lake or a bay is defined as _____. - ANS Seiching
The effect of the moon on tidal action is about _____. - ANS Twice the effect of the sun
The type of breaking wave that produces the greatest force when breaking is the _____ breaker.
- ANS Plunging
If the water conditions are reasonable to make a beach dive, all of the following procedures are
suggested: - ANS Having your buoyancy compensator partially inflated for slight positive
buoyancy.
Being fully equipped.
Getting as close to the water's edge as possible after timing the sets and lulls to match your
entry with the smallest waves.
Entering the water as quickly 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 _____. - ANS A rip current
Currents in bodies of water are formed by _____. - ANS Surface winds, The rotation of the
earth, The influence of the sun and moon
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