NAUI IQP - Environment & Equipment
UPDATED Questions and 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?
a.5000 psig (345 bar)
b.4280 psig (293 bar)
c.2250 psig (155 bar)
d.4980 psig (414 bar) - CORRECT ANSWER - a.5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders?
Permanent expansion. Stationary expansion. Indefinite expansion. Soluble expansion. -
CORRECT ANSWER - Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require cleaning
by a process called:
Stripping.Tumbling. Grinding. Sand Blasting. - CORRECT ANSWER - Tumbling
Which of the following is considered proper care of a scuba cylinder?
Exceeded the maximum allowable working pressure when filling.Preventing moisture from
entering the cylinder. Filling cylinders rapidly, approximately 1000 to 1500 psig (69 to 103 bar)
per minute. Heating cylinders to a high temperature. - CORRECT ANSWER - Preventing
moisture from entering the cylinder
Two cylinder valves in common use today are:
The K-valve and DIN valve. The R-valve and B- valve. The X-valve and DIN valve. The B-
valve and K-valve. - CORRECT 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?
Y valve J valve K valve R valve - CORRECT ANSWER - Y valve
Which internal valve designs are available in the first stage of scuba regulators?
Diaphragm; Pump
Piston; Diaphragm
Rod; Lifter
Ring; Shaft - CORRECT ANSWER - Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed to operate the
valve?
Unbalanced
Direct
Balanced
Linear - CORRECT ANSWER - Balanced
Which regulator second stage design uses air pressure rather than mechanical leverage to open
the main valve?
Unbalanced Torque Fluid Pilot - CORRECT 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?
Upstream Sidestream Backstream Downstream - CORRECT 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.
low; high
high; low
UPDATED Questions and 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?
a.5000 psig (345 bar)
b.4280 psig (293 bar)
c.2250 psig (155 bar)
d.4980 psig (414 bar) - CORRECT ANSWER - a.5000 psig (345 bar)
Which principle represents one basis for the hydrostatic testing of scuba cylinders?
Permanent expansion. Stationary expansion. Indefinite expansion. Soluble expansion. -
CORRECT ANSWER - Permanent expansion
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require cleaning
by a process called:
Stripping.Tumbling. Grinding. Sand Blasting. - CORRECT ANSWER - Tumbling
Which of the following is considered proper care of a scuba cylinder?
Exceeded the maximum allowable working pressure when filling.Preventing moisture from
entering the cylinder. Filling cylinders rapidly, approximately 1000 to 1500 psig (69 to 103 bar)
per minute. Heating cylinders to a high temperature. - CORRECT ANSWER - Preventing
moisture from entering the cylinder
Two cylinder valves in common use today are:
The K-valve and DIN valve. The R-valve and B- valve. The X-valve and DIN valve. The B-
valve and K-valve. - CORRECT 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?
Y valve J valve K valve R valve - CORRECT ANSWER - Y valve
Which internal valve designs are available in the first stage of scuba regulators?
Diaphragm; Pump
Piston; Diaphragm
Rod; Lifter
Ring; Shaft - CORRECT ANSWER - Piston; Diaphragm
Which valve is unaffected by cylinder air pressure with regard to the force needed to operate the
valve?
Unbalanced
Direct
Balanced
Linear - CORRECT ANSWER - Balanced
Which regulator second stage design uses air pressure rather than mechanical leverage to open
the main valve?
Unbalanced Torque Fluid Pilot - CORRECT 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?
Upstream Sidestream Backstream Downstream - CORRECT 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.
low; high
high; low
