TestOut LabSim A+ Certification Practice Exam

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What is a characteristic of CRT monitors?

  1. They use a liquid crystal display

  2. They have a flat screen design

  3. They use an electron beam in a vacuum tube

  4. They have no refresh rate

The correct answer is: They use an electron beam in a vacuum tube

CRT monitors are characterized by their use of an electron beam in a vacuum tube to display images. This technology relies on the principles of cathode ray tube design, where electrons are emitted from a heated cathode, accelerated, and focused into a beam. This beam scans across the phosphorescent screen, lighting up pixels to create an image. The vacuum tube environment allows the electrons to travel without interference from air molecules, which is essential for the proper operation of the monitor. The other options do not correctly describe CRT monitors. For example, CRT monitors typically have curved screens rather than flat designs, which are more characteristic of modern display technologies such as LCD or LED. Additionally, CRT monitors do have a refresh rate, which is the frequency at which the display updates the image to prevent flickering, and they definitely do not use liquid crystal technology.

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