-
The power supply in the PC is excessively dirty. How
would you clean it?
Compressed air
-
A hard drive should not be:
formatted before removing from the computer
-
What is the best method of cleaning a dusty PC
keyboard?
Remove the bezel and blow out the dust
-
What do you use to check for line-voltage
sags?
Polarity tester
-
Which of the following is most likely to cause a problem
with an unprotected hard disk drive?
A magnetic field from a large speaker
X-ray from a nearby monitor
Solar Winds
RFI from a nearby TV
-
Which is not a reason why compressed air is preferred
over vacuuming for cleaning dust from a circuit board? Choose one:
- Compressed air can generally provide greater
- cleaning power
Compressed air is less likely to cause ESD damage
Compressed air is less likely to spread dust
None of the above
-
Which of the following is most likely to protect a
personal computer system during an electrical storm?
- Totally disconnect all cables and power
- cords
Use surge suppressers on all AC outlets
Disconnect the line cords
Turn the AC power off
-
What do you use to check for line surges?
Polarity tester
-
Which of the following statements are true? Choose
one:
- When not being used, a 5-1/4" disk should be kept in
- its protective sleeve
- A hard drive should be protected from high magnetic
- fields
- A surge suppresser can help to protect a computer installation
- from high voltage spikes
- When cleaning PC boards, blowing dust away is preferred over
- vacuuming
All of the above
-
Which of the following should be used to clean the
external plastic cabinets of computers and their peripherals?
Acetone
All purpose spray cleaner
Damp cloth with a mild detergent
Wet cloth with a mild detergent
-
The purpose of a line analyzer is:
to warn of voltage spikes
-
Which of the following would make a computer installation
safer? Choose one:
An extension cord
Extra long cables
A switch box
Surge suppressers
-
The hard drive makes a grinding noise. The cause is
probably:
HDI (Head-to-Disk Interface)
a faulty SCSI connection
a software crash
a dirty read/write head
-
During the POST, what does a single beep
indicate?
Normal operation of the PC
-
Which of the following is NOT considered to be a field
replaceable unit (FRU)?
CPU chip
Co-processor
SIMM
Power supply regulator
-
During what process do you tell the PC the types of
drives being used?
CHKDSK
POST
SETUP
PREP
-
Diagnostics indicate that you have several bad field
replaceable units (FRUs). What do you do?
Replace the motherboard
- Replace the indicated FRUs one at a time, rerunning the
- diagnostics after each replacement
Replace all FRUs that were identified as bad
Investigate further to determine if the software is at fault
-
Which of the following would most likely result in the
mouse pointer NOT being displayed when you switch from DOS applications to
Windows applications?
A faulty mouse
A faulty serial interface
Wrong mouse driver in the CONFIG.SYS file
Wrong mouse driver in the SYSTEM.INI file
-
During what process do you tell the PC the amount of
conventional or extended memory being used?
SETUP
POST
Boot up
PREP
-
Which of the following is least likely to be a field
replaceable unit?
A board that plugs into the ISA bus
A socketed integrated circuit
A surface-mounted integrated circuit
A battery
-
Which of the following components will hold a charge even
though power has been removed?
Diode
Transistor
Capacitor
Rectifier
-
A multimeter is set up to DC, Ohms, and 20k. How would a
good 4-ampere fuse measure?
0.00
0.04
0.40
4.00
-
A multimeter is set up to DC, Ohms, and 20k. How would a
bad 4-ampere fuse measure?
0.00
Infinitely high
0.04
4.00
-
The farad is the basic unit of measurement
for:
resistors
inductors
capacitors
FETs
-
A circuit board in a computer can be destroyed by
voltages as low as:
100 volts
200 volts
1000 volts
30 volts
-
What should an ordinary household wall outlet
measure?
12 volts DC
104-130 volts DC
104-130 volts AC
210-250 volts AC
-
Which of the following can be caused by power source
(electric company and building wiring) problems?
Random memory errors
Damaged components inside the computer
Hard disk errors
Computer occasionally locks up
All of the above
-
Which of the following voltage levels would you not
expect to find at the output of a typical personal computer power supply? Choose
one:
+24 V
+12 V
+5 V
-5 V
-24 V
-
Which of the following voltages is NOT normally present
at the output of a personal computer power supply?
+5 V
-5 V
+12 V
-12 V
120 V
-
The wires coming from the power supply in a personal
computer are color coded to specify their purpose. What color are the ground (or
common) wires?
Red
Black
Yellow
Blue
-
Ohms is the basic unit of measurement for:
resistors
-
What is the basic unit of measurement for
resistors?
Ohms
-
What voltage should you measure on the yellow wires
coming from the power supply in a personal computer?
+5 volts
-5 volts
+12 volts
-12 volts
-
Which of the following best describes a standby power
supply?
- It uses an isolation transformer to remove AC line
- noise
- It uses metal oxide varistors (MOVs) to protect against AC line
- spikes
- It consists of a battery connected between the AC line and the
- computer. The AC line charges the battery, and the battery supplies power to the
- computer
- It consists of a battery connected between the AC line and the
- computer. The AC line simultaneously charges the battery and supplies power to
- the computer. When the AC line voltage is lost, the battery quickly switches so
- it, instead the AC line, powers the computer
-
What is the basic unit of measurement of
capacitors?
Farads
Ohms
Volts
Amperes
-
Which of the following does not provide surge protection?
Choose one:
A power conditioner
A standby power supply (SPS)
An uninterruptible power supply (UPS)
None of the above
-
The best uninterruptible power supplies (UPS) and standby
power supplies (SPS) produce which of the following output waveforms?
Sine waves
Square waves
Stairstep waves
Sawtooth waves
-
Which of the following is the smallest power interruption
that can cause memory errors or the computer to lock up?
1 second
1/200 second
10 seconds
1 minute
-
If a power supply has "watts capacity" rating of 200,
what does this mean?
The power supply uses up 200 watts
- The power supply always produces 200 watts. Therefore, the load
- you attach must be able to use up this much power
- This is the minimum amount of power the supply can
- provide
The power supply can provide up to 200 watts
-
When measuring an unknown voltage
- start with the meter set to its highest
- range
- remove power until the meter is connected to the
- circuited
start with the meter set to its lowest range
set the meter to the Ohms function
-
When using an ohmmeter:
- remove power to the circuit before attaching the
- meter
- you must physically break the circuit to insert the
- ohmmeter
- connect the meter in series with the component being
- measured
power must be applied to the circuit under test
-
Which of the following rules do not apply when using a
multimeter?
- Resistance is measured with the ohmmeter with all
- circuit power off
- When measuring current or voltage, if you are unsure which range
- to use, start with the highest range and work down
- Current and voltage are measured across the component with the
- power applied
- When measuring current, turn off the power, break the current
- path to be measured, connect the meter in series with the current path, and
- reapply power
-
A new external modem does not work properly. Which of the
following should be checked? Choose one:
The connections of the RJ-11 cable
The serial port settings
- The communications parameters such as speed, parity, data bits,
- and stop bits
- The communications software to make sure it is compatible with
- the modem
All of the above
-
The mouse works in MS-DOS but not in Windows 3.1. What do
you do?
Check for the proper mouse driver in the SYSTEM.INI file
-
You replaced your customer's motherboard. Before
returning the unit to the customer, what should you do?
Run SETUP
-
A customer calls with a printer problem. What information
should you gather first?
- Company name, customer name, type of computer, type
- of printer, the time at which he can bring the product in for service
- Customer name, Company name, type of printer, nature of the
- problem
- Where the printer was purchased, name of company, customer
- name
- Customer name, Company name, Company address, time at which it
- would be most convenient for you to pick up the printer
-
You replace a faulty motherboard. Before returning the
computer to the customer, you should:
run SETUP and setup the configuration
-
Which of the following is least likely to be affected by
a virus?
Floppy disk
Hard drive
BIOS in ROM
A file in RAM
-
Computer viruses are most likely to be spread
via:
on-line services
pirated games software
licensed application programs
licensed operating systems
-
Which of the following is not a recommended way to
minimize damage caused by a computer virus?
Frequently running a virus checker program
Frequently formatting your hard drive
Frequently backing up your data
Avoiding pirated software
-
A PC virus is least likely to attach itself
to:
a data file
the boot sector of your hard disk
a .COM file
a .EXE file
-
Which MS-DOS files are concerned with viruses?
MSAV, VSAFE, and MWAV
VER, CHKDSK, and SCAN
SCANDISK and CHKVIR
DMDRVR and FINDVIR
-
A virus is detected and successfully removed from a
customer's PC. What additional action should be taken to prevent
re-infection?
- Destroy all floppy disks that have been used
- recently on the PC
- Scan all floppy disks that have been used recently on the
- PC
Disconnect the PC from the network
Reformat the hard drive on the PC
-
Which of the following files is most likely to harbor a
virus?
COMMAND.COM
TEXTFILE.DOC
SALES99.XLS
IMAGE.BMP
-
Which of the following statements about PC viruses is not
true?
- The PC is infected only if it boots (or attempts to
- boot) from an infected disk; or if it executes an infected program
Viruses are not carried by PC data files
Some viruses reside in boot sector files
- The PC can not be infected by attempting to boot from a
- non-bootable floppy
-
What is the best ground to use when working on a personal
computer?
Chassis
Common
AC outlet ground
Computer
-
When should you not wear a wrist band ground
strap?
When working on a disk drive
When working on a CPU
When working on memory
When working around an exposed cathode ray tube (CRT).
-
Once an IC is mounted on a circuit board it
is:
- not susceptible to ESD damage if the board is not
- installed in the PC
still susceptible to ESD damage
- not susceptible to ESD damage if the board is properly installed
- in the PC
- not susceptible to ESD damage as long as the computer is turned
- off
-
Which of the following could generate electrostatic
voltages high enough to cause ESD damage? Choose one:
Combing your hair
Walking across a carpeted floor
Taking off your coat
Any one of the above
-
When shipping a board from one place to another, to avoid
ESD damage, the board should be:
placed inside an anti-static bag
grounded at all times
kept in high humidity environment
sprayed with antistatic spray before packing
-
When you use the computer chassis for ground, what should
you do?
- Keep the line cord plugged into an AC
- outlet
Disconnect the line cord
Disconnect all test equipment from ground
Do not wear a wristband ground strap
-
Which of the following techniques is the best way to
prevent ESD damage?
- Wear a properly connected ESD wrist strap when you
- work on microcomputer equipment
Work in a high humidity area
Work in a non-carpeted area
Handle circuit boards only by the edges
-
Which of the following types of mat will reduce static
electricity problems?
Nylon
Plastic
Rubber
Vinyl
-
Why is it NOT a good idea to wear a wrist band ground
strap when working around an exposed cathode ray tube (CRT)? Choose
one:
A CRT is like a big capacitor
- A CRT maintains a high charge even when disconnected from the
- circuit
- Wearing a ground strap increases your chances of accidental shock
- from the CRT
All of the above
-
Which of the following devices will reduce the risk of
ESD?
Line analyzer
Waveform generator
Ion generator
White noise generator
-
Which of the following semiconductors is most susceptible
to electrical noise and ESD?
TTL
FET
CMOS
DTL
-
Why should you keep the AC line cord plugged in if you
are using the computer chassis as your source of ground?
- Because the computer must have power applied to
- safely swap components
- Because the computer must have power applied during all
- tests
To ensure that the computer chassis is at earth ground
- Because this eliminates any possibility that you will receive an
- accidental electrical shock
-
A wrist grounding strap contains a:
resistor
capacitor
transistor
diode
-
Why is a CMOS memory chip more susceptible to ESD damage
than its earlier TTL counterpart?
The CMOS chip uses a higher voltage
- The dimensions of the transistors in CMOS are much
- smaller
Field effect transistors are impervious to ESD
Bipolar transistors are impervious to ESD
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