What is the best ground for a conductive work bench?
Answer: A
Correct answer: AC outlet
The bench is earthed to the ground pin of a properly wired AC outlet, which is the building's true earth. Grounding to another device or to a chassis only ties two floating points together.
Please log in or register to report this question.
When a bearing in the power supply fan goes out, what should you replace?
Answer: D
Correct answer: power supply
The fan in a PC supply is inside a sealed unit carrying line voltage and large capacitors, so the whole power supply is replaced rather than opened. Its cost is far below the risk of working inside it.
Please log in or register to report this question.
Every video card must have?
Answer: B
Correct answer: RAM
A video card must hold the image it is displaying, so it needs memory - the frame buffer, read out sixty or more times a second to refresh the screen. A processor of its own is optional; RAM is not.
Please log in or register to report this question.
What are the most likely conditions for ESD?
Answer: B
Correct answer: Cold and dry
Dry air is an insulator, so charge accumulates on a body instead of leaking away, and cold air holds less moisture than warm. Cold and dry is therefore the worst combination - which is why static problems are worst in winter.
Please log in or register to report this question.
14.4 modem should transmit _____ bits per second
Answer: A
Correct answer: 14,400-15,000
A modem's speed is quoted in bits per second, and 14.4 is shorthand for 14,400 bps - the k for kilo being dropped in speech.
Please log in or register to report this question.
What can you use to ensure power is not interrupted, resulting in corrupted data?
Answer: A
Correct answer: UPS
Only a UPS supplies power through an interruption; a surge protector deals with the opposite problem, and grounding with a third.
Please log in or register to report this question.
When not in use, it is very important to keep 5 1/4 diskettes in _____.
Answer: A
Correct answer: Their protective sleeves
A 5¼ inch diskette has an exposed media window, so the sleeve is what keeps dust and fingerprints off the recording surface.
Please log in or register to report this question.
UART is a type of serial chip. Its letters stand for:
Answer: B
Correct answer: universal asynchronous receiver/ transmitter
The UART converts between the parallel bytes of the bus and the serial bit stream of the line, adding and removing the start and stop bits.
Please log in or register to report this question.
What type of FRU is a SCSI host adapter?
Answer: B
Correct answer: I/O card
A SCSI host adapter is an expansion card that moves data in both directions between the bus and its devices, so as a field replaceable unit it is classed as an I/O card.
Please log in or register to report this question.
Which of these connects a computer to a network?
Answer: A
Correct answer: Network interface card
A network interface card connects a computer to a network, either by Ethernet cable or wirelessly. It is now built into almost every motherboard rather than being a separate card, though the name persists. Every NIC carries a MAC address, a 48-bit identifier assigned at manufacture and written as six pairs of hexadecimal digits. It identifies the hardware itself and does not change when the machine moves to a different network - unlike an IP address, which is assigned by the network and does change. The two work at different layers: the MAC address delivers a frame within a local network, and the IP address routes a packet between networks. The other cards named are expansion cards serving different purposes: a sound card handles audio input and output, a graphics card renders the display, and a TV tuner receives broadcast signals. All plug into PCI Express slots on the motherboard.
Please log in or register to report this question.
