NCTI - Installer Book Questions and
Answers Graded A+ 2024 Guide
Which 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%
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