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NCTI - Installer Book 151 Actual Questions and Answers 100% Correct
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? - Answer✅ C) Prevents ingress and egress.
Which of the following describes attenuation? - Answer✅ A reduction in signal strength through a cable system.
Which of the following is a feature of multimode fiber? - Answer✅ B) It is easier to handle and terminate than single-mode fiber.
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Which of the following describes the structure of fiber-optic cable? - Answer✅ B) Drop fiber cables may use buffer tubes containing steel wire.
Which of the following is true about CAT-1 cabling? - Answer✅ C) It is typically used in voice applications.
Which of the following twisted-pair cable types is the only one that is approved by certifying bodies for data rates in excess of 10 Mbps? - Answer✅ A) CAT-5.
Which of the following is responsible for reducing crosstalk in twisted-pair cable? - Answer✅ A) Number of twists.
Wireless networks use low-power RF signals; therefore, which of the following is true about signal strength? - Answer✅ A) The greater the distance between wireless devices, the lower the signal strength and data rate.
Which of the following is true about Wi-Fi technology? - Answer✅ D) The connection between the router and modem is always wired.
What percentage does a cables attenuation increase or decrease for every 10° change in temperature? - Answer✅ 1%
Which of the following is a characteristic of high-definition television (HDTV)? - 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 short lifespan, but has high-contrast, vibrantly accurate color images? - Answer✅ plasma
Which TV digital format was originally designed for progressive scan DVDs? - Answer✅ EDTV
Which type of television display has a deeper cabinet, which affects the size of the screen? - Answer✅ rear projector
Which device enables customers to schedule recordings of television programs? - Answer✅ B) Digital video recorder (DVR). dvr
The cable modem termination system (CMTS) is one of the two main components of DOCSIS architecture. What is the other? - Answer✅ B) Cable modem.
Which of the following is the CableLabs-led project built to define the architecture for the delivery of real-time Internet protocol (IP) applications? - Answer✅ C) PacketCable.
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