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48 Cards in this Set
- Front
- Back
What are the three types of SCUBA systems?
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Open Circuit Demand scuba
Closed circuit rebreathers Semi-Closed circuit rebreathers |
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Which of the three types of Scuba systems do recreational divers most commonly use?
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Open Circuit Demand scuba
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What is the hydrostatic test pressure for a European 200 bar cylinder?
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300 bar
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What is the hydrostatic test pressure for a European 232 bar cylinder?
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348 bar
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What must be done if corrosion is detected in a Scuba cylinder during a visual inspection?
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Tumbling for a number of hours using either carbide or aluminum oxide chips.
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What is the dual valve for a single cylinder called?
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“Y” or “H” valve
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What is the purpose of a dual valve for a single cylinder?
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They allow for the attachment of two separate regulators to the same cylinder for redundancy.
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What is the connection between two cylinders called?
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Manifold
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What a threaded connection between the regulator and cylinder called?
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DIN valve
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The first stage of a two-stage regulator reduces the cylinder pressure to _______________ pressure.
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Intermediate pressure
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The Intermediate pressure is from _______ to _______ PSI or ____ to _____ bar.
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90 to 150 PSI
6 to 10 bar |
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Because of their tendency to fail in a closed position, _________ are rare in modern regulators.
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Upstream valves
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A regulator whose valve operation is independent of cylinder or applied pressure has a _________ valve.
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Balanced valve
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What are the two types of regulator first stage internal valves?
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Piston and diaphragm
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A regulator main valve that is opened and closed using air pressure rather than mechanical leverage is called a ____________ regulator.
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Pilot Valve
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A greenish regulator filter indicates...
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Moisture in the cylinder or dripped onto the regulator filter
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A reddish regulator filter indicates...
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Rust from a steel cylinder
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A blackish regulator filter indicates...
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Carbon dust in the cylinder from a compressor filter.
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Airflow may be limited in some regulators at...
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Greater depths
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Regulator performance evaluation has traditionally been based on...
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Breathing resistance or effort
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Modern regulator performance is defined in terms of ____________ or breathing work.
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Maximum respiratory work level
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One of the most common pressure gauges is known as a ...
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Bourdon movement gauge
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The two types of pressure gauges for determining the amount of air in a scuba cylinder are a ______ and a _____.
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Surface pressure gauge and a submersible pressure gauge (SPG)
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Dive computers allow for longer dive time since they take into account ___ when compared to the “square” dive profiles required to use most tables.
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Time spent at shallower depths during the course of the dive
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List three indicators of contaminated air
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White mist
Sloshing Bad odor |
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In the US, cylinders must be given a hydrostatic test every _____.
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5 years
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A visual inspection is due at least _________
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annually
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Two potential hazards of rust inside a tank are:
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oxidation reducing O2 content
structural weakening |
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If a regulator is described as two stage, it means...
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it reduces air pressure to a breathable level in two steps
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The normal reserve pressure setting of a J-valve may either be...
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300 psig or 300 psi above ambient
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The advantage of a Y or slingshot valve is that...
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it allows an additional reg set on the same tank
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Air cylinders should be filled at approximate rate of ...
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300 to 500 psi per minute
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The main valve of a pilot valve regulator is opened and closed using ______ rather than _______.
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air pressure
mechanical leverage |
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List three suitable regulator attachments
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SPG
BC inflator hose Octopus |
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An extra second stage should be functionally tested every...
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6 months
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Regulator intermediate pressure remains above....
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a constant ambient pressure
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Regulator first-stage valves are made in two types:
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piston
diaphragm |
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To avoid pressure accidents, the high pressure port is______ than the low pressure port in the first stage of modern regulators
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larger
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Digital instruments are very accurate, but have two short comings:
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expensive
more subject to failure |
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At a reading of 500 psi, SPGs may be expected to provide an accuracy range of plus or minus ______ to ______psi
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100
35 |
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Name the three typs of bourdon instruments in diving
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Open
Sealed Oil filled |
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While simple and inexpensive, the open capillary depth guage suffers from a least three short comings:
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Corrosion
Silting Blockage by salt crystals |
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An accurate, non-bourdon, analog depth guage will likely be based on the ______type
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diaphragm
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Epilepsy with GABA is caused by Inhibition of neuronal hyperactivity in ____ while SN inhibits colliculi.
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foci
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Dive computers generally allow longer dive times than tables because...
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they compensate for time spent at various depths
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There are two types of electronic dive computers:
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tissue based
table based |
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If your computer fails during a dive, you should ....
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ascend immediately and perform a 5 min safety stop at 15 feet
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Liquid-filled construction is a desirable compass feature, but such devices are much more susceptible to damage from ...
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Heat
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