NCTI ACTUAL EXAM REVIEW GUIDE WITH
PRACTICE SOLUTION AND GRADED A PLUS
ANSWERS 2026
• Which of the following will strengthen signals as they move farther
away from the headend through the trunk express system? Answer: A)
Feeder Cables
• 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.
, • 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%
PRACTICE SOLUTION AND GRADED A PLUS
ANSWERS 2026
• Which of the following will strengthen signals as they move farther
away from the headend through the trunk express system? Answer: A)
Feeder Cables
• 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.
, • 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%
