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NCTI exam 2023 with 100% correct answers
NCTI exam 2023 with 100% correct answers
[Meer zien]Voorbeeld 2 van de 15 pagina's
Voorbeeld 2 van de 15 pagina's
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Voorbeeld van de inhoud
NCTI - Installer BookWhich of the following will strengthen signals as they move farther away from the headend through the
trunk express system? - correct answer -B) Distribution amplifiers.
Which of the following describes a carrier wave? - correct answer -B) A wave with a much higher
frequency than the input signal.
Which of the following describes modulation? - correct 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? - correct answer -W = watts
Which of the following describes the process of measuring an analog signal at a specific interval? -
correct answer -Sampling
Which of the following is true about the base 10 system? - correct answer -B) Digits 0 through 9 are
used.
Which of the following best describes post bit-error-rate (BER)? - correct 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? - correct answer -6:1
At what modulation error ratio (MER) should a 256-quadrature amplitude modulation (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 the name of the
technique that allows the signals to be sent without losing data integrity? - correct answer -B) Time
division multiple access (TDMA).
, In a coaxial cable, what is the purpose of the shielding? - correct answer -C) Prevents ingress and egress.
Which of the following describes attenuation? - correct answer -A reduction in signal strength through a
cable system.
Which of the following is a feature of multimode fiber? - correct answer -B) It is easier to handle and
terminate than single-mode fiber.
Which of the following describes the structure of fiber-optic cable? - correct answer -B) 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 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? - correct answer -A) CAT-5.
Which of the following is responsible for reducing crosstalk in twisted-pair cable? - correct answer -A)
Number of twists.
Wireless networks use low-power RF signals; therefore, which of the following is true about signal
strength? - correct 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? - correct 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? -
correct answer -1%
Which of the following is a characteristic of high-definition television (HDTV)? - correct answer -D) Audio
surround sound using Dolby Digital technology.
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