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4. Which port type offers the fastest transfer speed?

A. IEEE 1394a

B. IEEE 1394b

C. Full-Speed USB

D. Hi-Speed USB

5. You take a tech call from a user who complains that she gets an error message, “Hub power exceeded,” when she plugs her new thumb drive into her USB keyboard’s external USB port. Worse, the device won’t work. What’s most likely the problem?

A. Her USB port is defective.

B. She has a defective thumb drive.

C. She plugged a hi-speed device into a full-speed port.

D. She plugged one too many devices into the USB hub.

6. What is the fastest speed that Hi-Speed USB 2.0 can go?

A. 12 Mbps

B. 120 Mbps

C. 400 Mbps

D. 480 Mbps

7. USB 1.1 devices can run at two speeds. What are the speeds?

A. 1 and 2 Mbps

B. 1.5 and 12 Mbps

C. 1.5 and 15 Mbps

D. 12 and 48 Mbps

8. What’s the maximum cable length for USB?

A. 1.2 meters

B. 1.2 yards

C. 5 meters

D. 5 feet

9. Which of the following mice technologies most needs to be cleaned?

A. Ball

B. Optical

C. Parallel

D. Serial

10. If you attempt to scan an item and the scanner light assembly does not move, what is most likely the problem?

A. The scanner is frozen.

B. The scanner is broken.

C. The scanner light assembly is locked.

D. The scanner light assembly is resetting.

Answers

1. D. The UART handles the serial to parallel and parallel to serial translation.

2. A. The host controller controls USB devices plugged into the USB bus via a USB port.

3. C. The bus speed decreases because all devices share the same total bandwidth; power usage increases.

4. B. FireWire 800 easily spanks the competition here.

5. D. Just like the error message said, the thumb drive drew too much power for the hub to handle.

6. D. Hi-speed USB 2.0 has a theoretical maximum of 480 Mbps.

7. B. USB 1.1 devices can run at either 1.5 Mbps or 12 Mbps.

8. C. USB has a maximum cable length of 5 meters.

9. A. Ball mice get the dirtiest.

10. C. The scanner light assembly is most likely locked.

CHAPTER 19

Video

In this chapter, you will learn how to

Explain how video displays work

Select the proper video card

Install and configure video

Troubleshoot basic video problems

The term video encompasses a complex interaction among numerous parts of the PC, all designed to put a picture on the screen. The monitor or video display shows you what’s going on with your programs and operating system. It’s the primary output device for the PC. The video card or display adapter handles all of the communication between the CPU and the monitor (see Figure 19-1). The operating system needs to know how to handle communication between the CPU and the display adapter, which requires drivers specific for each card and proper setup within Windows. Finally, each application needs to be able to interact with the rest of the video system.

Figure 19-1 Typical monitor and video card

Let’s look at monitors and video cards individually. I’ll bring them back together as a team later in the chapter so you can understand the many nuances that make video so challenging. Let’s begin with the video display and then move to the video card.

Video Displays

To understand displays, you need a good grasp of each component and how they work together to make a beautiful (or not so beautiful) picture on the screen. Different types of displays use different methods and technologies to accomplish this task. Video displays for PCs come in three varieties: CRT, LCD, and projectors. The first two you’ll see on the desktop or laptop; the last you’ll find in boardrooms and classrooms, splashing a picture onto a screen.

Historical/Conceptual

CRT Monitors

Cathode ray tube (CRT) monitors were the original computer monitors—those heavy, boxy monitors that take up half your desk. Although for the most part they’ve been replaced by LCD technology on new systems, plenty of CRT monitors are still chugging away in the field. As the name