Equipment Quiz Flashcards
If water gets inside a steel tank, a substance will form that is called:
mold
aluminum oxide
salt crystals
iron oxide (rust)
iron oxide (rust)
If you were to run out of air, where do you expect to find your buddies alternate air source?
only on your left side
in plain view of the triangular area between the mouth and lower corners of the rib cage
on a hose that is 50cm/20in longer than your standard hose
all of the above
in plain view of the triangular area between the mouth and lower corners of the rib cage
What special considerations are needed when planning a deep dive?
The diver will use more air
Breathing will become more difficult
The diver may have difficulty controlling his ascent/decent
All of the above
All of the above
You are diving on the Spiegel Grove with your computer. When diving with computers you should:
make sure you and your buddy both have computers and you follow the most conservative one
stay close to your buddy if yours fails and continue your dive
avoid many of the guidelines required when diving with tables
both a and c are correct
make sure you and your buddy both have computers and you follow the most conservative one
The _______ reduces the high pressure air from the tank to intermediate pressure.
first stage
pilot valve
second stage
J valve
first stage
If you are diving on the wreck of the Duane and your computer fails what is the general guideline you should follow?
surface immediately and monitor yourself for signs of decompression sickness
ascend to 5m/15ft and make a long safety stop, possibly as long as air supply permits
use your buddy’s computer and continue your dive at a shallower depth
use the information you last saw on your computer to plan the rest of your dive at a shallower depth
ascend to 5m/15ft and make a long safety stop, possibly as long as air supply permits
Recreational diving is also referred to as ________ scuba, which refers to the fact that the exhaled air is released directly into the water.
semiclosed circuit
closed circuit
open circuit
none of the above
open circuit
A regulator that is designed to neither assist nor resist the opening of a valve due to tank pressure is called:
an unbalanced regulator
a first stage regulator
a balanced regulator
a piston regulator
a balanced regulator
A__________depth gauge that will give you theoretical depths rather than actual depths when diving at altitudes above 300m/1000ft is called:
open bourdon tube
oil filled
capillary
closed bourdon tube
capillary
The two common types of connections on a scuba tank for attaching the regulator are:
DIN and manifold
DIN and K valve
DIN and yoke screw
Screw and J valve
DIN and yoke screw
Visual Inspections should be performed at least once a year in order to prevent:
contamination build up inside the tank
possible galvanic action between the threads of the valve and tank neck
internal and external corrosion
all of the above
all of the above
Regulators that are said to have downstream valves, will have the valve open in the direction away from the high pressure air entering the regulator. This creates a _______________________ feature for the valve.
security
Ventura
fail safe
low cracking pressure
fail safe
A valve that opens in the direction of the flow of air is called a:
downstream valve
upstream valve
K valve
burst disk
downstream valve
What is an open bourdon tube depth gauge?
a tube that calculates depth based off of a flexible diaphragm
a tube that calculates depth by having water enter the tube
a tube that calculates depth by transducer sensors
None of the above
a tube that calculates depth by having water enter the tube
The _____ must always personally analyze the contents of an enriched air cylinder.
buddy of the diver who will use it
Divemaster
Captain
diver that will be using the tank
diver that will be using the tank
Why is it a good idea to avoid the maximum limits of dive tables?
depth gauges can malfunction and/or be read inaccurately
It’s hard to read dive tables underwater
Dive tables are not accurate
None of the above
None of the above
A regulators first stage will take the air pressure to the divers ambient pressure.
True
False
False
Two cylinder valves in common use today are:
The K-valve and DIN valve.
The R-valve and B- valve.
The J valve and DIN valve.
The 8-valve and K-valve.
The K-valve and DIN valve.
Which internal valve designs are available in the first stage of scuba regulators?
Diaphragm/ Pump
Piston/ Diaphragm
Rod/ Lifter
Ring/Shaft
Piston/ Diaphragm
A device that is a part of a tank valve that will reduce the possibility of an overpressurized cylinder exploding is called:
a J-valve
a burst disk
an over-pressure relief valve
a demand valve
a burst disk
True or False: Divers can share computers if they are doing the exact same dive profile.
True
False
False
Which of the following is considered proper care of a scuba cylinder?
Exceed the maximum allowable working pressure when filling.
Preventing moisture from entering the cylinder.
Filling cylinders rapidly, approximately 1000 to 1500 psig per minute.
Heating cylinders to a high temperature.
Preventing moisture from entering the cylinder.
Divers should avoid diving to the maximum limits because depth gauges may not be precise and read inaccurately.
True
False
True
Green discoloration on the first stage of a scuba regulator indicates:
Corrosion from a steel cylinder
Carbon graphite dust from the scuba air compressor
Water has most likely entered the first stage
none of the above
Water has most likely entered the first stage
In the event of a regulator fist stage malfunction, which type of valve design would be likely to eliminate air flow to the diver?
upstream
sidestream
backstream
downstream
upstream
Hydrostatic testing involves placing a cylinder in a water filled chamber and filling it with compressed air to 5/3 its working pressure.
True
False
False
Regulators are referred to as having demand valves. This indicates that they are activated when the diver inhales.
True
False
True
If a visual cylinder inspection reveals corrosion inside a scuba cylinder, it may require:
stripping
tumbling
grinding
sound blasting
tumbling
A DIN valve is:
a simple on/off valve
a connection in which the regulator is directly screwed
a valve with a reserve mechanism
A valve in a second stage
a connection in which the regulator is directly screwed
Megan is diving her new regulator. At a depth of 10m/30ft, she discovers that her alternate air continues to free flow. The alternate is free flowing because the 2nd stage requires adjustment so the air coming from it is at _________________pressure.
the divers ambient pressure
a higher pressure
no adjustment necessary
the regulators intermediate pressure
the divers ambient pressure
What is an electronic SPG?
pressure is determined by water entering .the tube
pressure is determined by a pressure transducer
pressure is determined by a series of levers
none of the above
pressure is determined by a pressure transducer
A capillary depth gauge works:
by Boyles Law
in shallow waters
by a series of pressure sensitive gears
an oil filled tube
by Boyles Law
At least every _____________________scuba tanks should receive a visual inspection. Every ________________years the tank must hydrostatically tested.
2 months, 5 years
12 months, 5 years
24 months, 5 years
12 months, 2 years
12 months, 5 years
Which first stage type is unaffected by cylinder air pressure with regards to the force needed to operate the valve?
Unbalanced
Direct
Balanced
Linear
Balanced
In reference to a modern scuba regulator, if it fails it is designed to free-flow rather than shutting off all air. This is known as a ______.
burst disk
fail safe
bourdon tube
pressure relief valve
fail safe
What are the three types of SPGs?
mechanical, electronic, hose-less
mechanical, electronic, hose attached
mechanical, oceanic, legend
electronic, hose-less, oceanic
mechanical, electronic, hose-less
Markings that you will usually find on a scuba tank include:
the tanks working pressure
the tanks serial number
date of last hydrostatic test
all of the above
all of the above
Wearing a computer gauge on your wrist could cause some minor entanglement with gear as you gear up
True
False
True
When Captain Bill goes ice diving he makes sure his first stage will not freeze up by buying one that has been:
properly lubricated
designed with a fail safe
environmentally sealed
none of the above
environmentally sealed
Which of the following tank markings designate the type of metal used to construct the scuba tank?
3000
5@98
3AA
756432
3AA
Muriel has just purchased a discounted regulator from Bubba’s Dive Ctr. The owner’s manual indicates that it is an unbalanced regulator. This means that the regulator will________________
Be required weighting for true balance
delivers Nitrox equally well
affect the way the regulator breathes based on tank pressure.
will breath the same regardless of tank pressure
affect the way the regulator breathes based on tank pressure.
The K Valve was designed to warn the diver that he has run low on air. When air was running low the reduced pressure enabled a spring mechanism to begin shutting off air flow. By pulling the lever down the mechanism released and normal air flow was restored.
True
False
False
Which of the following cylinder markings designates the type of metal used to construct the scuba cylinder?
3AL
7@89
675432
3000
3AL
Which of the following cylinder markings designates the hydrostatic test date?
3AL
7@89
675432
3000
7@89
The (+) designation that appears on _____________ cylinders denotes that the cylinder may be overfilled to ________ beyond its working pressure.
steel/15%
aluminum/10%
steel and aluminum/10%
steel/10%
steel/10%
A steel cylinder whose capacity is 71.2 cubic feet at 2475 psi and an aluminum cylinder whose capacity is 80 cubic feet at 3000 psi are both filled to 2000 psi. Which cylinder contains more air?
The steel cylinder
The aluminum cylinder
Both would hold equal amounts.
The answer cannot be determined from the information given.
The steel cylinder
The steel cylinder contains more air. To answer this question, you need to compare how much capacity each “psi” accounts for. In a steel cylinder each “psi” accounts for .0287 cubic feet (71.2 cubic feet divided by 2475 psi = .0287 cubic feet per psi). In an aluminum cylinder each “psi” accounts for .0266 cubic feet (80 cubic feet divided by 3000 psi = .0266 cubic feet per psi).
These constants can now be used to quickly determine how much capacity remains in a cylinder of a certain pressure. In the question, a steel 71.2 cubic foot cylinder filled to 2000 psi contains 57.4 cubic feet (.0287 cubic feet per psi x 2000 = 57.4 cubic feet). An aluminum 80 cubic foot cylinder contains only 53.2 cubic feet (.0266 cubic feet per psi x 2000 psi = 53.2 cubic feet).
Aluminum cylinders were introduced because aluminum is a stronger metal and enables higher working pressures than in steel cylinders.
True
False
False
What are the advantages of a DIN connector over the standard yoke screw system? (choose all that apply)
A better seal between the cylinder and regulator
Less expensive
Stronger connection
Less likely to freeze
A better seal between the cylinder and regulator
Stronger connection
To prevent a scuba cylinder from rupturing due to overpressurization, a burst disk is installed in the _____________, and is designed to rupture when the cylinder pressure rises above about _____________ of the cylinder’s rated pressure.
regulator/200%
cylinder neck/225%
valve/140%
submersible pressure gauge/125%
valve/140%
A burst disk only needs to be replaced if it ruptures.
True
False
False
Why is it important to avoid any process involving heat treatment when having a scuba cylinder painted or refinished?
To avoid weakening the cylinder’s metal.
Painting a cylinder is unnecessary.
To prevent the cylinder from rusting.
To avoid contaminating the cylinder’s interior.
To avoid weakening the cylinder’s metal.
To ensure the structural integrity of a scuba cylinder, it should be _____________ anytime it is _____________.
destroyed/at an age of twenty years
hydrostatically tested/exposed to temperatures above 180°F
visually inspected/left unused for more than two years
All of the above are correct
hydrostatically tested/exposed to temperatures above 180°F
To what pressure is a scuba cylinder filled during a hydrostatic test?
5000 psi
200% of its working pressure
5/3s of its working pressure
The exact pressure depends upon what happens to the cylinder once it is pressurized.
5/3s of its working pressure
During a hydrostatic test a scuba cylinder is placed in a water-filled chamber. The cylinder is then filled with compressed air and the amount of expansion that occurs in the cylinder is measured by the amount of water that is displaced.
True
False
False
Under what circumstances should a scuba cylinder be visually inspected?
If loose material is heard rolling around inside the cylinder
If a red or green accumulation is seen on the filter of the regulator first-stage
Once every year even if the cylinder appears in good condition
All of the above are correct.
All of the above are correct.
During a visual inspection on a scuba cylinder, what it the technician looking for? (choose all that apply)
Hydrostatic pressure.
Severe exterior damage.
Severe interior corrosion.
Galvanic action between the cylinder and valve.
Severe exterior damage.
Severe interior corrosion.
Galvanic action between the cylinder and valve.
During a visual inspection on a scuba cylinder, what it the technician looking for? (choose all that apply)
Hydrostatic pressure.
Severe exterior damage.
Severe interior corrosion.
Galvanic action between the cylinder and valve.
Severe exterior damage.
Severe interior corrosion.
Galvanic action between the cylinder and valve.
The term “open circuit” refers to the fact that:
electricity is used to test the regulator’s air-flow rate.
the regulator is made from nonmagnetic metal.
the exhaled air is released directly into the water.
All of the above are correct.
the exhaled air is released directly into the water.
The term “demand valve” refers to the fact that the regulator will provide air
during both inhalation and exhalation.
only upon inhalation.
only upon exhalation.
at a constant flow regardless of the inhalation effort.
only upon inhalation.
What are the primary advantages of the open-circuit, demand valve regulator? (choose all that apply)
More efficient gas use versus a free-flow system.
Requires no care or maintenance.
Helps avoid carbon dioxide buildup by reducing dead air spaces.
Simpler to use than closed-circuit systems.
More efficient gas use versus a free-flow system.
Helps avoid carbon dioxide buildup by reducing dead air spaces.
Simpler to use than closed-circuit systems.
The function of the second-stage of a scuba regulator is to take the intermediate pressure gas delivered by the first stage and break it down to ambient pressure for the diver to breathe.
True
False
True
A pilot valve refers to a second-stage design that:
uses a small valve to assist the opening of the main valve.
directs the air flow more directly to the diver.
requires the use of an ultra-high pressure cylinder.
All of the above are correct.
uses a small valve to assist the opening of the main valve.
Fail safe refers to a regulator’s tendency to _____________ because of the use of a(n) _____________ valve in the second-stage.
breathe easily/open circuit
free-flow/downstream
breathe easily/closed circuit
free-flow/upstream
free-flow/downstream
The primary advantage of the fail-safe design of regulators is that in the event of a malfunction, air is still delivered to the diver.
True
False
True
An environmental seal operates by
not allowing water to directly contact the first-stage piston or diaphragm.
not allowing water to directly contact the second-stage piston or diaphragm.
increasing the temperature of the first-stage.
causing increased turbulence in the air flow of the first-stage.
not allowing water to directly contact the first-stage piston or diaphragm.
What are the advantages of an environmental seal of the first-stage?
(choose all that apply) Protects the regulator from sun damage. Prevents regulator freeze up. Encourages diving in a conservative manner. Prevents dirt and debris from entering.
Prevents regulator freeze up.
Prevents dirt and debris from entering.
A valve that tends to open in the direction of flow is referred to as _____________ while a valve that tends to close in the direction of flow is referred to as _____________ .
open circuit/closed circuit
closed circuit/open circuit
upstream/downstream
downstream/upstream
downstream/upstream
The primary advantage of balanced first-stages over unbalanced ones is that
they breathe easier at greater depths even at low cylinder pressures.
they provide greater air flow.
they are better able to supply a second diver breathing from an octopus.
All of the above are correct.
All of the above are correct.
Two divers may use a single dive computer provided they are careful to remain together and dive the exact same profile.
True
False
False
A buddy team exits the water. Both divers are using dive computers. After a short surface interval, they plan another dive to 60 feet. One device allows 38 minutes of bottom time at 60 feet, the other allows only 32 minutes. Based on this information how should they plan their dive?
Plan a maximum bottom time of 38 minutes because computers are intentionally designed to be more conservative than dive tables.
Plan a maximum bottom time of 32 minutes because computers are intentionally designed to be more conservative than dive tables.
Plan a maximum bottom time of 38 minutes but be sure to make a safety stop before surfacing.
Plan a bottom time of somewhat less than 32 minutes and make a safety stop before surfacing.
Plan a bottom time of somewhat less than 32 minutes and make a safety stop before surfacing.
A capillary depth gauge works by using:
a simple system of pressure sensitive gears.
a mechanical pressure transducer.
Boyle’s Law.
Archimedes’ Principle.
Boyle’s Law.
While on a dive in a mountain lake at an altitude of 10,000 feet, a diver checks his depth. He is using a capillary depth gauge which indicates a depth of 45 feet. If he actually measured the linear distance to the surface from where he is, he would find that:
he is exactly 45 feet beneath the surface.
he is actually more than 45 feet below the surface.
he is actually less than 45 feet below the surface.
The answer cannot be determined from the data provided.
he is actually less than 45 feet below the surface
The oil-filled bourdon tube analog depth gauge works by ___________________.
pressure causing a sealed coil tube to coil tighter
pressure causing a diaphragm to flex
pressure causing the transducer to vary its electrical transmission
pressure pushing water up an air filled tube.
pressure causing a sealed coil tube to coil tighter
What special considerations are important in terms of equipment when planning a deep dive?
The diver will use air more quickly than at a shallower depth.
Breathing will become more difficult than at a shallower depth.
The diver may have difficulty controlling his descent/ascent.
All of the above are correct.
All of the above are correct.
