Which is LEAST likely to interfere with upgrading to a newer DOS version?
Answer: B
Correct answer: Video controller
A DOS upgrade touches the BIOS interface, the disk structures and the existing files, so all three of those can obstruct it. The video controller is addressed the same way by every version, so it is the least likely to interfere.
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A 6xx indicates a problem with the:
Answer: A
Correct answer: floppy drive
In the POST numbering, 6xx is the floppy drive. 1xx is the system board, 3xx the keyboard and 17xx the hard disk.
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A system has two IDE hard drives that are each divided into primary and extended partitions, which drive letter is assigned to the primary partition of the second drive?
Answer: B
Correct answer: D
Drive letters are assigned to all primary partitions first, in drive order, and only then to logical drives in the extended partitions. So the first drive's primary is C and the second drive's primary is D.
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What tool is used to test serial and parallel ports?
Answer: C
Correct answer: loop backs (wrap plugs)
A loopback plug connects a port's output pins back to its input pins, so diagnostic software can send data and check that the same data returns. That tests the port itself without needing a device attached.
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The acronym HDI stands for:
Answer: D
Correct answer: Head to disk interference
HDI is head-to-disk interference - contact between the flying head and the platter, which is what a head crash consists of. The heads normally fly a fraction of a micron clear.
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What component would most likely cause a "parity error"?
Answer: C
Correct answer: bad RAM
The parity bit is written with each byte and checked on every read, so a mismatch means the stored bits have changed. That is a memory fault by definition.
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What is the paper feeding technology most commonly associated with dot-matrix printers?
Answer: B
Correct answer: tractor feed
A dot matrix printer pulls continuous stationery through by sprockets engaging the perforated edges - the tractor feed - which keeps the paper aligned through many pages.
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What configuration should a Volt-Ohm meter be set to when testing a fuse?
Answer: D
Correct answer: Ohms
A fuse is tested for continuity, which is a resistance measurement, so the meter is set to ohms - and to be safe the fuse is removed from the circuit first.
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A PC with a 486DX2 processor runs internally at 50Mhz. What speed would its external logic be running?
Answer: B
Correct answer: 25Mhz
The DX2 runs its core at twice the bus speed, so an internal 50 MHz means an external
\[ \frac{50}{2} = 25\ \text{MHz} \]
Clock doubling raised processor speed without requiring faster and more expensive motherboards.
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You are testing the resistance in Ohms of a fuse on a 15K amp system. If the fuse is good, the meter should read?
Answer: A
Correct answer: 0.0
A good fuse is a piece of wire, so its resistance is effectively zero and the meter reads 0.0. A blown fuse reads as an open circuit.
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