NCTI - Installer Book 151 Actual Questions and Answers 100% Correct
Question : Which of the following will strengthen signals as
they move farther away from the headend through the trunk express system?
- Distribution amplifiers.
Correct answer: B) Distribution amplifiers.
Question : Which of the following describes a carrier wave?
- A wave with a much higher frequency than the input
signal.
Correct answer: B) A wave with a much higher frequency
than the input signal.
Question : Which of the following describes modulation?
- The reshaping of a carrier wave to include information
contained by an input signal.
Correct answer: B) The reshaping of a carrier wave to include
information contained by an input signal.
Question : Which of the following is the symbol for power?
W = watts
Correct answer: W = watts
Question : Which of the following describes the process of
measuring an analog signal at a specific interval?Sampling
Correct answer: Sampling
Question : Which of the following is true about the base 10
system?
- Digits 0 through 9 are used.
Correct answer: B) Digits 0 through 9 are used.
Question : Which of the following best describes post bit-
error-rate (BER)?
- A measurement of all bit error after forward error
correction has been applied.
Correct answer: A) A measurement of all bit error after
forward error correction has been applied.
Question : Which of the following compression rates will
enable six digital programs to be transmitted rather than one analog channel in a 6 MHz bandwidth?
6:1
Correct answer: 6:1
Question : At what modulation error ratio (MER) should a
256-quadrature amplitude modulation (QAM) signal operate?32db or greater
Correct answer: 32db or greater
Question : 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?
- Time division multiple access (TDMA).
Correct answer: B) Time division multiple access (TDMA).
Question : In a coaxial cable, what is the purpose of the
shielding?
- Prevents ingress and egress.
Correct answer: C) Prevents ingress and egress.
Question : Which of the following describes attenuation?
A reduction in signal strength through a cable system.
Correct answer: A reduction in signal strength through a cable
system.
Question : Which of the following is a feature of multimode
fiber?
- It is easier to handle and terminate than single-mode fiber.
Correct answer: B) It is easier to handle and terminate than
single-mode fiber.
Question : Which of the following describes the structure of
fiber-optic cable?
- Drop fiber cables may use buffer tubes containing steel
wire.