Practice Quiz

CompTIA DHTI+ Practice Questions - Question List

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61. Which of the following channels on a video line has the greatest loss in a VHF system?
  1. 10
  2. 40
  3. 25
  4. 13
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62. Which of the following statements about NTSC and PAL are not true?
  1. NTSC uses a fixed resolution of 525 horizontal lines and PAL uses 625 horizontal lines.
  2. NTSC displays 30 frames per second and PAL displays at 25 frames per second.
  3. PAL is a higher resolution format for DVD than NTSC.
  4. Movies on NTSC DVDs play back 4% faster than their PAL counterparts.
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63. Which of the following is the dB signal loss per 100 feet for a RG6 coaxial cable?
  1. 10
  2. 12
  3. 4
  4. 6
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64. You are experiencing dark bars on your TV video display. Which of the following may be the most probable cause of this issue?
  1. AC power interference
  2. Insufficient cable bandwidth
  3. Signal interruption between TV and modulator
  4. High signal strength
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65. How many frequencies combine to produce a tone in a telephone?
  1. Three
  2. Two
  3. Five
  4. Six
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