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NCTI – INSTALLER BOOK EXAM QUESTIONS AND ANSWERS
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NCTI – INSTALLER BOOK EXAMQUESTIONS AND ANSWERS
Which of the following will strengthen signals as they travel further away from
the headend via the trunk express network? - ANSWER B: Distribution
amplifiers.
Which of the following defines a carrier wave? - ANSWER B) A wave with
significantly greater frequency than the input signal.
Which of the following defines modulation? - ANSWER B) The reshaping of a
carrier wave to add information from an input signal.
Which of the following is the sign of power? - ANSWER W = Watts.
Which of the following defines the procedure for measuring an analogue signal
at a given interval? - Answer Sampling
Which of the following is true about the base ten system? - ANSWER B) Digits
0-9 are used.
Which of the following best characterizes the post-bit-error rate (BER)? -
ANSWER A) An assessment of all bit errors after forward error correction has
been done.
Which of the following compression rates allows six digital programs to be
broadcast instead of one analog channel in a 6 MHz bandwidth? - Answer: 6:1.
,What modulation error ratio (MER) should a 256-quadrature amplitude
modulation (QAM) signal use? - ANSWER 32dB or higher.
On the return trip, signals from many sources must be routed over the same
wire. What is the name of the approach that allows signals to be delivered while
maintaining data integrity? - Answer B: Time division multiple access
(TDMA).
What is the function of shielding in a coaxial cable? - ANSWER C: Prevents
ingress and egress.
Which of the following defines attenuation? - ANSWER A drop in signal
intensity via a cable system.
Which of the following are characteristics of multimode fiber? - ANSWER B) It
is more convenient to handle and terminate than single-mode fiber.
Which of the following describes the construction of a fiber-optic cable? -
ANSWER B) Steel-wire buffer tubes may be used in drop fiber cables.
Which of the following statements are true about CAT-1 cabling? - ANSWER
C) It is primarily utilized in voice applications.
Which twisted-pair cable type is the only one certified by certifying authorities
for data rates of more than 10 Mbps? - ANSWER A) CAT 5.
Which of the following is responsible for decreasing crosstalk in twisted-pair
cables? - ANSWER A: Number of twists.
, Wireless networks use low-power RF waves, so which of the following is true
about signal strength? - ANSWER A) As the distance between wireless devices
increases, the signal strength and data rate decrease.
Which of the following statements are accurate about Wi-Fi technology? -
ANSWER D) The router and modem are always wired.
What percentage does a cable's attenuation increase or reduce with every 10°
variation in temperature? - ANSWER 1 percent
Which of the following describes high-definition television (HDTV)? -
ANSWER D) Audio surround sound with Dolby Digital technology.
Which form of screen display is known to consume a lot of energy, have a
limited lifespan, and produce high-contrast, vividly realistic color images? -
ANSWER Plasma
Which TV digital format was intended specifically for progressive scan DVDs?
- Answer EDTV
Which sort of television display has a deeper cabinet, which influences the
screen size? - ANSWER, rear projector
Which device allows clients to arrange recordings of television shows? - B)
Digital video recorder (DVR). dvr
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