Quiz #1

2009-02-26T23:55:00.000-08:00

1. What is the reason for technicians to wear special wrist grounding straps?
==> The reason why technicians wear special wrist grounding straps is to Protect sensitive electronic components and computer boards from ESD (electrostatic discharge) damage.
From Wikipedia, the free encyclopediahttp://en.wikipedia.org/wiki/Antistatic_wrist_strap
Jump to: navigation, searchAn antistatic wrist strap, ESD wrist strap, or ground bracelet is an antistatic device used to prevent electrostatic discharge (ESD) by safely grounding a person working on electronic equipment. It consists of a stretchy band of fabric with fine conductive fibers woven into it. The fibers are usually made of carbon or carbon-filled rubber, and the strap is bound with a stainless steel clasp or plate. They are usually used in conjunction with an anti-static mat on the workbench, or a special static-dissipating plastic laminate on the workbench surface.An antistatic wrist strap with crocodile clip.The wrist strap is connected to ground through a coiled retractable cable and 1 megaohm resistor, which allows high-voltage charges to leak through but prevents a shock hazard when working with low-voltage parts. Where higher voltages are present, extra resistance (0.75 megaohm per 250V) is added in the path to ground to protect the wearer from excessive currents; this typically takes the form of a 4 megohm resistor in the coiled cable (or, more usually, a 2 megohm resistor at each end). Very cheap wrist straps do not have conductive fabric and instead use the fabric to hold the metal plate against the skin, which can result in reduced ESD protection over time as the metal corrodes.Wrist straps in industry usually connect to Earth Bonding Points (part of the grounding system) via either a 4 mm plug or 10 mm press stud, whereas personally owned straps are likely to be connected to ground via a crocodile clip.In addition to wrist straps, ankle and heel straps are used in industry to bleed away accumulated charge from a body. These devices are usually not tethered to earth ground, but instead incorporate high resistance in their construction, and work by dissipating electrical charge to special floor tiles. Such straps are used when workers need to be mobile in a work area and a grounding cable would get in the way, such as in an operating theatre.Wireless or Dissipative wrist straps are available, but they are widely considered as pseudoscientific hoax products. The claims of the operating principles vary from "Ion Neutralization, Skin Effect, Point Discharge and Corona Discharge Effect" to "Selglard electric halo principles".[1][2]
2. After installing a new computer component why is it important to obtain the most current driver for it?
==> A device driver is a program that controls a particular type of device that is attached to your computer. There are device drivers for printers, displays, CD-ROM readers, diskette drives, and so on. When you buy an operating system, many device drivers are built into the product. However, if you later buy a new type of device that the operating system didn't anticipate, you'll have to install the new device driver. A device driver essentially converts the more general input/output instructions of the operating system to messages that the device type can understand. You need to have a newer version of your device driver because a newer version of a device driver has new features on it.http://searchenterprisedesktop.techtarget.com/sDefinition/0,,sid192_gci211938,00.html
3. What are the steps required to install a peripheral device?
==>Installing a Peripheral
Adding a Peripheral Device to a System
Adding a new peripheral device that is not-pluggable usually involves the following:
1.Shutting down the system
2.Connecting the device to the system
3.Rebooting the systemUse How to Add a Peripheral Device to add the following devices that are not hot-pluggable to a system:CD-ROMSecondary disk driveTape driveSBUS cardIn some cases, you might have to add a third-party device driver to support the new device.
For information on hot-plugging devices, see Chapter 6, Dynamically Configuring Devices (Tasks).
How to Add a Peripheral Device Become superuser.(Optional) If you need to add a device driver to support the device, complete the procedure How to Add a Device Driver .Create the /reconfigure file.# touch /reconfigureThe /reconfigure file causes the Solaris software to check for the presence of any newly installed devices the next time you turn on or boot your system.Shut down the system.# shutdown -i0 -g30 -y -i0Brings the system to the 0 init state, which is the appropriate state for turning the system power off for adding and removing devices.-g30Shuts the system down in 30 seconds. The default is 60 seconds.-yContinues the system shutdown without user intervention. Otherwise, you are prompted to continue the shutdown process.Select one of the following to turn off power to the system after it is shut down:For SPARC platforms, it is safe to turn off power if the ok prompt is displayed.For x86 platforms, it is safe to turn off power if the type any key to continue prompt is displayed.Turn off power to all peripheral devices.For the location of power switches on any peripheral devices, refer to the hardware installation guides that accompany your peripheral devices.Install the peripheral device, making sure that the device you are adding has a different target number than the other devices on the system.Often, a small switch is located at the back of the disk for selecting the target number.Refer to the hardware installation guide that accompanies the peripheral device for information on installing and connecting the device.Turn on the power to the system.The system boots to multiuser mode, and the login prompt is displayed.Verify that the peripheral device has been added by attempting to access the device.For information on accessing the device, see Accessing Devices .http://www.answers.com/topic/how-to-install-a-pc-peripheral
4. If a newly installed peripheral device does not function properly what steps can be taken to correct the problem?
==>Check if the product or the hardware you bought has no defect or company defects.You should also check for driver updates for all your peripheral devices. If you're up to date, and you started having issues around the time you last updated a driver, try backing down to a lower version.http://www.bautforum.com/archive/index.php/t-62740.html
5. Explain the technique used to help protect data on a hard drive when doing a clean install?
==>One of the techniques available to help protect data is to divide the hard drive into multiple partitions. With a clean install, many technicians prefer to create one partition for data and a separate partition for the OS. This enables an OS to be upgraded without the risk of losing data. It also simplifies backup and recovery of data files.
6. Explain what a software patch is.
http://en.wikipedia.org/wiki/Patch_(computing)
==>A patch is a small piece of software designed to fix problems with or update a computer program or its supporting data. This includes fixing bugs, replacing graphics and improving the usability or performance. Though meant to fix problems, poorly designed patches can sometimes introduce new problems (see software regressions).

2008-11-18T01:27:00.000-08:00

Personal Computer

Monitor

Another term for display screen. The term monitor,
however, usually refers to the entire box, whereas
display screen can mean just the screen. In addition,
the term monitor often implies graphics capabilities.

System Unit

The main part of a perso nal computer.
The system unit includes the chassis,
microprocessor, main memory, bus,
and ports, but does not include the ke-
yboard or monitor, or any peripheral devices.

A system unit is sometimes called a box or main unit.

Keyboard

The set of typewriter-like keys that enables you
to enter data into a computer. Computer keyboards
are similar to electric-typewriter keyboards but
contain additional keys. The keys on computer
keyboards are often classified as follows:
alphanumeric keys -- letters and numbers
punctuation keys -- comma, period, semicolon,
and so on.
special keys -- function keys, control keys, arrow
keys, Caps Lock key, and so on.

Mouse

A device that controls the movement of the cursor
or pointer on a display screen. A mouse is a small
object you can roll along a hard, flat surface. Its
name is derived from its shape, which looks a bit
like a mouse, its connecting wire that one can ima-
gine to be the mouse's tail, and the fact that one
must make it scurry along a surface. As you move
the mouse, the pointer on the display screen moves
in the same direction. Mice contain at least one
button and sometimes as many as three, which have
different functions depending on what program is
running. Some newer mice also include a scroll wheel
for scrolling through long documents.

Speaker

An electro-acoustic transducer that converts electrical
signals into sounds loud enough to be heard at a distance.
Synonymous with loudspeaker.

AVR (Automatic Voltage Regulator)

AVR is an abbreviation for Automatic Voltage Regulator

.It is important part in Synchronous Generators,

it controls the output voltage of the generator by controlling

its excitation current. Thus it can control the output

Reactive Power of the Generator.

UPS(Uninterruptible Power Supply)

Short for uninterruptible power supply, a power
supply that includes a battery to maintain power in
the event of a power outage. Typically, a UPS keeps
a computer running for several minutes after a power
outage, enabling you to save data that is in RAM and
shut down the computer gracefully. Many UPSs now
offer a software component that enables you to
automate backup and shut down procedures in case
there's a power failure while you're away from the
computer.

Hardware Sofware Technology

Quiz #1