What command is used to reset a MODEM when using the "AT Command Set"?
Answer: B
Correct answer: ATZ
ATZ resets the modem to its stored profile. Every command in the set begins with the attention prefix AT.
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ESD potential decreases with the use of:
Answer: B
Correct answer: A wrist strap
A wrist strap keeps the technician at the potential of the equipment, so no discharge can occur. De-ionizing fans help in a manufacturing area but do nothing for the person handling the board, and rubber gloves prevent the charge escaping at all.
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When is the risk for electrostatic discharge the greatest?
Answer: C
Correct answer: Low humidity
Dry air is an insulator, so charge accumulates on a body instead of leaking away. Humid air conducts just enough to bleed it off, which is why static problems are worst in winter and in air-conditioned rooms.
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How many DMA channels are there in an AT class PC?
Answer: D
Correct answer: 8
An AT class PC has two cascaded DMA controllers giving eight channels, 0 to 7. Channel 4 is used for the cascade itself, so seven are available to devices.
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Dust in a computer actually increases the size of the magnetic fields inside it. This is not good, so you must occasionally dust, I trust. What's the best way to do this?
Answer: D
Correct answer: non-static compressed air
Compressed air blows dust out without touching anything and without generating charge. An ordinary vacuum builds a static charge at its nozzle, and breath carries moisture.
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After trying to unload a TSR, you get an error message saying that other TSRs were loaded after the one you tried to remove. Which of the following commands could you use to see the current load order?
Answer: D
Correct answer: MEM /C
MEM /C classifies memory by program, listing what is loaded and how much each occupies - which shows the order in which the resident programs went in. MEM /P pages the output rather than classifying it.
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What could cause a fixed disk error?
Answer: D
Correct answer: Incorrect CMOS settings
The BIOS reads the drive's geometry and mode from CMOS, so wrong settings there make a perfectly good disk unreadable and produce a fixed disk error. Bad RAM and a slow processor give quite different symptoms.
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An important first step in troubleshooting which component in a laser printer is causing a jam is to:
Answer: A
Correct answer: note where in the paper path the paper stops
Where the paper stops identifies which mechanism failed - pickup, registration, fusing or exit. Beginning there narrows the search before any measurement is taken.
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An anti static strap uses a small _____ to make sure you do not become the least path of resistance to the ground?
Answer: D
Correct answer: resistor
The strap's resistor lets accumulated static bleed away slowly while limiting the current that could flow through the wearer if a live conductor were touched.
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Missing slot covers on a computer can cause?
Answer: A
Correct answer: over heat
The case is designed so that air drawn in by the fan passes over the components and out again. An open slot lets air take a short cut, so the flow past the cards falls and they run hot.
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