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31.
Which of the following would be the best choice as a personal display technology if a user wants to save desk space and not have to deal with interference from nearby speakers?
  • A.
    CRT
  • B.
    HDMI
  • C.
    LCD
  • D.
    Projector
  • Answer & Explanation
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Answer : [C]
Explanation :
LCDs do not have electron guns that are aimed by magnets as CRTs do. This difference makes LCDs more compatible with nearby speaker magnets. Additionally, the cathode ray tube for which CRT monitors are named is a rather bulky component, requiring more desk space to accommodate the CRT’s cabinet. Projectors are not common personal display devices; they are used more in group environments. HDMI is a standard for connecting display devices, not a type of display device.
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32.
An associate is trying to explain why a particular model of CRT monitor displays images in such high quality but is unable to recall a specific term. The associate mentions that each phosphor is on average only 0.25mm away from the nearest phosphor of the same color. What is the associate trying to describe?
  • A.
    Resolution
  • B.
    Dot pitch
  • C.
    Refresh rate
  • D.
    The number of dots per inch
  • Answer & Explanation
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Answer : [B]
Explanation :
The associate is trying to think of the term dot pitch. Essentially, dot pitch is the height of a dot-phosphor trio added to the distance between the next dot trio in the same direction. It works out to be the distance from any point on one dot to the same point on the next dot of the same color. The smaller this number, the better the display quality. The number of dots per inch is a similar concept but inversely proportional and not measured in fractions of a millimeter. Resolution is a software concept; dot phosphors are hardware related. The refresh rate has nothing to do with how close the chemical dots are to one another.
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33.
Which of the following is true regarding a monitor’s refresh rate?
  • A.
    As long as the graphics adapter can refresh the image at a particular rate, the attached monitor can accommodate that refresh rate.
  • B.
    The refresh rate is normally expressed in MHz.
  • C.
    The refresh rate is normally selected by using the controls on the front panel of the monitor.
  • D.
    As you lower the resolution, the maximum refresh rate allowed tends to increase.
  • Answer & Explanation
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Answer : [D]
Explanation :
The maximum allowable refresh rate does tend to be affected by the resolution you choose in the operating system. The refresh rate is most often expressed in cycles per second (Hz), not millions of cycles per second (MHz). You must usually select the refresh rate you want from the display settings dialog boxes, not through the monitor’s built-in menu system, although the monitor’s system can often tell you which refresh rate you’re using. Finally, both the monitor and adapter must agree on the refresh rate you select. If either device does not support a particular refresh rate, such a rate cannot be used.
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34.
Which statement about LCDs is most accurate?
  • A.
    The concept of refresh rate has no meaning with regard to LCDs.
  • B.
    LCDs are preferred to CRTs because they can display a larger range of resolutions.
  • C.
    LCDs tend not to be as clear as CRTs.
  • D.
    LCDs require more power than CRTs.
  • Answer & Explanation
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Answer : [C]
Explanation :
At the same resolution, CRTs are more likely to display a clearer image than LCDs. LCDs are normally limited to a fixed, native resolution but require less power than CRT monitors. Although LCD screens are not regularly and systematically refreshed the way CRTs are, the LCD refresh rate dictates how often any one pixel is allowed to change.
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35.
If you are unable to display a given resolution on a monitor, which of the following might explain why?
  • A.
    The graphics adapter does not have enough memory installed.
  • B.
    The video display unit does not have enough memory installed.
  • C.
    You are using a CRT with a single fixed resolution.
  • D.
    You have the refresh rate set too high.
  • Answer & Explanation
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Answer : [A]
Explanation :
The amount of memory installed on a graphics adapter is directly related to how many pixels can be displayed at one time and how many colors the pixels can be set to. Monitors don’t have memory installed in them. LCDs, not CRTs, have a single, fixed resolution called the native resolution. By default, you might be limited to a particular refresh rate because the resolution is too high, but the refresh rate is automatically adjusted down, if necessary, when you select a resolution.
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