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NCTI - Installer Book Exam with verified detailed answers

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NCTI - Installer Book Exam with verified detailed answers

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NCTI - Installer Book Exam with verified detailed ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




answers

Which of the following will strengthen signals as they move farther away from the
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headend through the trunk express system? - correct answer✔✔B) Distribution amplifiers.
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Which of the following describes a carrier wave? - correct answer✔✔B) A wave with a
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much higher frequency than the input signal.
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Which of the following describes modulation? - correct answer✔✔B) The reshaping of a
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carrier wave to include information contained by an input signal.
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Which of the following is the symbol for power? - correct answer✔✔W = watts
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Which of the following describes the process of measuring an analog signal at a specific
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interval? - correct answer✔✔Sampling ||\\|//|| ||\\|//|| ||\\|//||




Which of the following is true about the base 10 system? - correct answer✔✔B) Digits 0
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through 9 are used. ||\\|//|| ||\\|//|| ||\\|//||




Which of the following best describes post bit-error-rate (BER)? - correct answer✔✔A) A
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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
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rather than one analog channel in a 6 MHz bandwidth? - correct answer✔✔6:1
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,At what modulation error ratio (MER) should a 256-quadrature amplitude modulation
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(QAM) signal operate? - correct answer✔✔32db or greater ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




On the return path, signals from many sources must be sent on the same cable. What is
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the name of the technique that allows the signals to be sent without losing data integrity? -
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correct answer✔✔B) Time division multiple access (TDMA).
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In a coaxial cable, what is the purpose of the shielding? - correct answer✔✔C) Prevents
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ingress and egress. ||\\|//|| ||\\|//||




Which of the following describes attenuation? - correct answer✔✔A reduction in signal
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strength through a cable system. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Which of the following is a feature of multimode fiber? - correct answer✔✔B) It is easier
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to handle and terminate than single-mode fiber.
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Which of the following describes the structure of fiber-optic cable? - correct answer✔✔B)
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Drop fiber cables may use buffer tubes containing steel wire. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Which of the following is true about CAT-1 cabling? - correct answer✔✔C) It is typically
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used in voice applications. ||\\|//|| ||\\|//|| ||\\|//||




Which of the following twisted-pair cable types is the only one that is approved by
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certifying bodies for data rates in excess of 10 Mbps? - correct answer✔✔A) CAT-5. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Which of the following is responsible for reducing crosstalk in twisted-pair cable? - correct
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answer✔✔A) Number of twists. ||\\|//|| ||\\|//|| ||\\|//||

, Wireless networks use low-power RF signals; therefore, which of the following is true
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about signal strength? - correct answer✔✔A) The greater the distance between wireless
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devices, the lower the signal strength and data rate. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Which of the following is true about Wi-Fi technology? - correct answer✔✔D) The
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connection between the router and modem is always wired. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




What percentage does a cables attenuation increase or decrease for every 10° change in
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temperature? - correct answer✔✔1% ||\\|//|| ||\\|//|| ||\\|//||




Which of the following is a characteristic of high-definition television (HDTV)? - correct
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answer✔✔D) Audio surround sound using Dolby Digital technology. ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Which type of screen display has been known to use a great deal of energy, can have a
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short lifespan, but has high-contrast, vibrantly accurate color images? - correct
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answer✔✔plasma



Which TV digital format was originally designed for progressive scan DVDs? - correct
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answer✔✔EDTV



Which type of television display has a deeper cabinet, which affects the size of the screen? -
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correct answer✔✔rear projector
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Which device enables customers to schedule recordings of television programs? - correct
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answer✔✔B) Digital video recorder (DVR). dvr ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




The cable modem termination system (CMTS) is one of the two main components of
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DOCSIS architecture. What is the other? - correct answer✔✔B) Cable modem.
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