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TEXT FOR HEADING-QUIZ QUESTIONS
The following excerpts are used with the questions in the preceding. If
you've already answered all the questions in this quiz, you're done! No
need to continue.
Text for Question 4
Buoyancy Control Device (BCD)
The buoyancy control device, or BCD, is another piece of equipment for
all scuba divers. Its basic role is to regulate your buoyancy, or how much
you float or sink in the water. This is important because a great rise or
fall in depth can result in decompression sickness and can be fatal (if not
treated). The BCD contains two kinds of inflation techniques to allow you
to increase buoyancy: orally, or mechanically through a low pressure hose
from your air tank. The BCD also contains an air-dump valve that allows
your the decrease buoyancy in the event that you begin to ascend
unintentionally (or too quickly) .
Types of BCDs.There are three basic styles of BCDs. The
back-mounted BCD, in Figure B1, is similar to a backpack because it rests
behind the diver. Another type shown in Figure B2, the front-mounted BCD,
is in the form of a life vest and is worn over the head. The third type of
BCD shown in Figure B3, the jacket-style, is worn like a vest you put on
for hunting or fishing. It contains no sleeves, and contains air pouches
in front and back of the diver. Modern day divers tend to use the
jacket-style BCD the most. At any rate, make sure you choose a BCD that is
constructed with a double-bladder system (an air pouch made of urethane
plastic that holds air, surrounded by a nylon shell that protects the inner
pouch from harm).
Backpacks
Backpacks are intended to hold a tank securely to the divers back.
They usually contain a frame made of high-impact plastic, as well as, nylon
webbing creating shoulder straps and a waist strap. Most backpacks are
built into a BCD.
Back to question 4.
Text for Question 5
Laser-Jet Printers: Comparisons
There are numerous manufactures of printers, each having many different
models. This comparison is limited to three models from different
companies: the Hewlett-Packard LaserJet 4M Plus, the Digital Equipment
Corporation DEClaser 3500N, and the Canon LBP-1260.
Price. The manufacturers' suggested price for the printers
includes Ethernet and 6MB to 7MB of RAM. The Hewlett-Packard LaserJet 4M
Plus sells for $1899. The Digital Equipment Corporation DEClaser 3500N
LBP-1260 was the most expensive, selling for $1999. The Canon LBP-1260
sells for $1299 [1:161]. The least expensive printer is the Canon
LBP-1260.
How they perform. All printers were compared . . . .
Back to question 5.
Text for Question 6
Laser-Jet Printers: Comparisons
Price. The manufacturers' suggested price for the printers
includes Ethernet and 6MB to 7MB of RAM. The Hewlett-Packard LaserJet 4M
Plus sells for $1899. The Digital Equipment Corporation DEClaser 3500N
LBP-1260 was the most expensive, selling for $1999. The Canon LBP-1260
sells for $1299 [1:161]. The least expensive printer is the Canon
LBP-1260.
Performance. All printers were compared . . . .
Back to question 6.
Text for Question 7
. . . was adequate when printing text only, but slow when printing
graphics. [1:160-161]. The best performing printer is the LaserJet 4M
Plus printer by Hewlett-Packard.
Usability. In this area, the LaserJet 4M Plus printer had the
easiest installation and great software. The DEClaser 3500N was fairly
easy to setup, but lacked network-control software. The LBP-1260 was the
one of the hardest to install. There was a problem with the hardware
interface, and no printer-control software was included [1:160-161]. The
easiest printer to use is the LaserJet 4M Plus printer by Hewlett-Packard.
Table 1 illustrates the usability comparisons . . .
Back to question 7.
Text for Question 8
II. LOGGING ONTO THE DATABASE
This type of network involves such a large geographical area and so
many different customers that it is not practical to assume that all
workstations will be of the same type. The following instructions will
attempt to cover all of the workstations currently on the network but as
new equipment is added and developed you may find that your particular
workstation is not listed. If this is the case please contact technical
support at DCE Systems, Inc. for additional documentation and assistance.
Using a Televideo Terminal on the Network
The first step in using any terminal is to turn on the power and with the
Televideo terminals this is accomplished with a button that pushes in at
the bottom right corner of the display screen. When the terminal is
powered on pay attention to the self-test routine which includes a loud
beep followed by a message on the screen indicating whether the terminal
components passed or failed the test.
Back to question 8.
Text for Question 9
III. COMPONENTS OF SCUBA-DIVING EQUIPMENT
As you begin the sport of scuba diving, it is important to know the
key pieces of equipment you'll be using--their functions, characteristics,
quality considerations, and costs. Scuba equipment includes such items as
the mask, fins, snorkel, bouyancy control device, backpack, and several
others. Each of these will discussed in detail in the following sections.
[Spot 1]
[Spot 2] The mask enables you to view the underworld, as well as allows you to
control constant pressure in your sinus cavities. Goggles, the other
alternative lenses, only cover your eyes and do not enclose your nose.
This failure to equalize pressure can result in what is known as a mask
squeeze or a negative pressure that could implode your skull and
surrounding tissues. Be certain to purchase a mask specifically designed
for scuba diving, not just poolside sports.
[Spot 3] Masks are composed of a faceplate or lens, a comfortable silicon or
rubber skirt and a head strap made of similar material. They range in
styles from simple round or oval-shaped models to more modern styles with
lower internal volumes and a wider field of vision. A low-profile mask,
shown in Figure M1, has a notched faceplate and a nose . . . .
Back to question 9.
Text for Question 10
Buoyancy Control Devices (BCD)
The buoyancy control device, or BCD, is another piece of equipment for
all scuba divers.
[Spot 1]
[Spot 2] Its basic role is to regulate your buoyancy, or how much
you float or sink in the water. This is important because a great rise or
fall in depth can result in decompression sickness and can be fatal (if not
treated). The BCD contains two kinds of inflation techniques to allow you
to increase buoyancy: orally, or mechanically through a low pressure hose
from your air tank. The BCD also contains an air-dump valve that allows
your the decrease buoyancy in the event that you begin to ascend
unintentionally (or too quickly) .
[Spot 3]
[Spot 4] There are three basic styles of BCDs. The back-mounted BCD, in Figure
B1, is similar to a backpack because it rests behind the diver. Another
type shown in Figure B2, the front-mounted BCD, is in the form of a life
vest and is worn over the head. The third type of BCD shown in Figure B3,
the jacket-style, is worn like a vest you put on for hunting or fishing.
It contains no sleeves, and contains air pouches in front and back of the
diver. Modern day divers tend to use the jacket-style BCD the most. At
any rate, make sure you choose a BCD that is constructed with a
double-bladder system (an air pouch made of urethane plastic that holds
air, surrounded by a nylon shell that protects the inner pouch from harm).
Back to question 10.
Text for Question 11
Regulators
The next item of equipment to consider is what attaches to the tank
valve, the regulator. This piece of equipment is designed to convert high
pressure air of a scuba tank to a level which we can breathe. The
mechanism of a regulator is very simple, as you inhale, a flexible
diaphragm is sucked inward opening the inlet valve of the regulator by
pushing down a lever. As you exhale, that same diaphragm is forced outward
releasing the lever and allowing the valve to close. (See Figure R1 for
further explanation on this concept). Attached to the mechanism is a
mouthpiece similar to that of a snorkel. This allows the diver to breath
air through the largest airway, the mouth. A purge valve is installed also
in the regulator which allows you to access free flowing air should the
regulator fail or to clear water from the valve.
[Spot 1--level 1]
[Spot 1--level 2]
[Spot 1--level 3] The regulator is connected to the tank valve
at a point called the octopus.This is a group of three high-pressure hoses
and a low-pressure hose. Two high-pressure hose consists of a regulator
connecting to the tank valve by a high-pressure hose. The second stage
high-pressure hose, usually called an alternate air source, is used as an
emergency regulator for you if your first stage high-pressure hose is not
working properly or as for your buddy during an emergency. The third hose
is connected to the submersible pressure gauge. The low-pressure hose
connects to the low-pressure inflator of your BCD. Figure O1 gives an
example of a typical octopus.
Back to question 11.
Text for Question 12
[Spot 2--level 1]
[Spot 2--level 2]
[Spot 2--level 3]The next step in setting up your new video driver under OS/2 is to prepare
your installation disks from the file you downloaded. You will need two
preformatted 3-1/2 inch diskettes.
- Create a directory on your computer called TMPINST.
- Copy 732_OS2A.EXE to that directory.
- From an OS/2 command prompt type: 732_os2a to extract the file.
- Place the first formatted diskette in the floppy drive . . . .
Installing the OS/2 Drivers
The last step is installing the drivers you downloaded by utilizing the
diskettes made in the previous step. To install the drivers, please follow
the numbered steps below carefully.
- Make sure your OS/2 system is set to standard VGA. To check . . .
Back to question 12.