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NCTI - Installer Book Exam

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Which of the following will strengthen signals as they move farther away from the headend through the trunk express system? - Answer B) Distribution amplifiers. Which of the following describes a carrier wave? - Answer B) A wave with a much higher frequency than the input signal. Which of the following describes modulation? - Answer B) The reshaping of a carrier wave to include information contained by an input signal. Which of the following is the symbol for power? - Answer W = watts Which of the following describes the process of measuring an analog signal at a specific interval? - Answer Sampling Which of the following is true about the base 10 system? - Answer B) Digits 0 through 9 are used. Which of the following best describes post bit-error-rate (BER)? - Answer A) A measurement of all bit error after forward error correction has been applied. Which of the following compression rates will enable six digital programs to be transmitted rather than one analog channel in a 6 MHz bandwidth? - Answer 6:1 At what modulation error ratio (MER) should a 256-quadrature amplitude modulation (QAM) signal operate? - Answer 32db or greater On the return path, signals from many sources must be sent on the same cable. What is the name of the technique that allows the signals to be sent without losing data integrity? - Answer B) Time division multiple access (TDMA). In a coaxial cable, what is the purpose of the shielding? - Answ

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