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