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NCTI - Installer Book (Complete Guide)
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NCTI - Installer Book (Complete Guide)Which of the following will strengthen signals as they move farther away from
the headend through the trunk express system? Correct Ans - B)
Distribution amplifiers.
Which of the following describes a carrier wave? Correct Ans - B) A
wave with a much higher frequency than the input signal.
Which of the following describes modulation? Correct Ans - 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 Ans - W=
watts
Which of the following describes the process of measuring an analog signal at
a specific interval? Correct Ans - Sampling
Which of the following is true about the base 10 system? Correct Ans -
B) Digits 0 through 9 are used.
Which of the following best describes post bit-error-rate (BER)? Correct
Ans - 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 Ans - 6:1
At what modulation error ratio (MER) should a 256-quadrature amplitude
modulation (QAM) signal operate? Correct Ans - 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 Ans - B) Time division multiple access
(TDMA).
,In a coaxial cable, what is the purpose of the shielding? Correct Ans -
C) Prevents ingress and egress.
Which of the following describes attenuation? Correct Ans - A
reduction in signal strength through a cable system.
Which of the following is a feature of multimode fiber? Correct Ans -
B) It is easier to handle and terminate than single-mode fiber.
Which of the following describes the structure of fiber-optic cable?
Correct Ans - B) Drop fiber cables may use buffer tubes containing steel
wire.
Which of the following is true about CAT-1 cabling? Correct Ans - 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
Ans - A) CAT-5.
Which of the following is responsible for reducing crosstalk in twisted-pair
cable? Correct Ans - A) Number of twists.
Wireless networks use low-power RF signals; therefore, which of the
following is true about signal strength? Correct Ans - 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 Ans -
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 Ans - 1%
Which of the following is a characteristic of high-definition television (HDTV)?
Correct Ans - 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? Correct Ans - plasma
Which TV digital format was originally designed for progressive scan DVDs?
Correct Ans - EDTV
Which type of television display has a deeper cabinet, which affects the size of
the screen? Correct Ans - rear projector
Which device enables customers to schedule recordings of television
programs? Correct Ans - 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? Correct Ans -
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?
Correct Ans - C) PacketCable.
A cable gateway typically includes a cable modem, multiple quadrature
amplitude modulation (QAM) tuners, a telephone interface, and a multiport
and wireless router. What is the function of the multiple quadrature
amplitude modulation (QAM) tuners? Correct Ans - C) Convert legacy
DTV services being transported on QAM carriers to an IP format that can be
received by IP devices.
What is the function of the central processing unit (CPU) in a computer,
laptop, or tablet? Correct Ans - A) It controls input, processing,
storage, and output functions.
Which operating system is used exclusively on a Mac computer? Correct
Ans - OS X
What is the best thing to do if you are wearing a hard hat in windy conditions?
Correct Ans - C) Put the chin strap on.
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