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NCTI Part 2 Exam With 100% Correct Answers 2023
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NCTI Part 2 Exam With 100% CorrectAnswers 2023
Which of the following problem(s) are caused by egress? - Correct Answer-Interference
with aeronautical navigation an communication, amateur radio, public service, and
cellular communications.
What cumulative leakage index (CLI) meets Federal Communications Commision
(FCC) requirements? - Correct Answer-64 or less
What is the maximum allowable signal detectable in the airspace during flyover? -
Correct Answer-10 µv/m
CLI calculations do not include leakage below: - Correct Answer-50 µv/m.
Which of the following is a repair order specification when measuring leakage levels? -
Correct Answer-The location of the leak.
What is the FCC specification regarding repair of leakage of the 20 µv/m level?. -
Correct Answer-there is no FCC specified time.
A dipole antenna is used for FCC tests because: - Correct Answer-Its performance is
well characterized.
What leakage level must be entered in the leakage log? - Correct Answer-Leaks 20
µv/m or higher measured 10 feet from the cable.
What are the disadvantages of using an slm for leakage detection? - Correct Answer-
Less sensitive than a leakage detector and doesn't have an alarm.
How long must the leakage log be kept on file? - Correct Answer-2 years
What geometric shape is a sine wave based upon? - Correct Answer-A right degree
triangle
what are the three elements of a carrier wave that can be manipulated? - Correct
Answer-Amplitude, frequency, and phase.
In a Hybrid Fiber Coax (HFC) network what type of crude amplitude (AM) detector
causes common path distortion (CPD)? - Correct Answer-An envelope detector.
what are the peaks and minima of the amplitude modulation (AM) waveform envelope
related to? - Correct Answer-The amplitude of the modulation signal.
,In a conventional amplitude modulation (AM) transmission, how much power is in the
sidebands and how much is in the carrier? - Correct Answer-Two-thirds of the power is
in the carrier with one-third in the sidebands.
Why can Carson's Rule be used to determine the bandwidth of a frequency modulation
(FM) carrier? - Correct Answer-In most cases, the amplitude of the sidebands furthest
from the carrier frequency are so low that they can be ignored.
Applying Carson's Rule to determine the bandwidth of a narrowband frequency
modulation (FM) carrier, what is the most significant factor? - Correct Answer-the
maxumim modulation signal frequency.
under what principle do frquency modulation (FM) detector circuit designs operate? -
Correct Answer-That voltage is created when the signal frequency moves from the
center frequency.
How many symbols are available at the output of a quadrature phase shift keying
(QPSK) modulator? - Correct Answer-4 symbols, each containing 2 bits of data.
what prevents the subcarriers in orthogonal frequency division multiplexing (OFDM)
from interferring with each other? - Correct Answer-The peak power of each subcarrier
aligns with the minimum power of the adjacent subcarrier.
what information remains afer the intermediate frequency (IF) signal is detected, or
demodulated? - Correct Answer-Analog or digital baseband information.
In a radio receiver, what is almost universally used to conduct the energy between the
antenna and the receiver tuner? - Correct Answer-Coaxial cable
what two significant signals go into the mixer to create the intermediate frequency (IF)?
- Correct Answer-The RF signal frequency at the output of the front end filter and the
local oscillator (LO) signal.
What part of a receiver has several functions that include limiting the number of signals
that reach the amplifier and mixer? - Correct Answer-The front end filter.
what is used in set-top boxes (STB) to strike a balance between image rejection, the
bandwidth of the intermediate frequency (IF) filter, and the frequency which modulation
is done? - Correct Answer-Double IF conversion.
what type of bandpass filters offer the precision, stability, and bandwidth most suitable
for TV and set-top box (STB) intermediate frequency (IF) sections? - Correct Answer-
Surface acoustic wave (SAW) filters.
, what is used in some receivers to remove all the attenuation before the amplifier until
the received signal reaches a designed threshold? - Correct Answer-Delayed automatic
gain control (AGC).
which class of amplifier utilizes a push-pull amplifier configuration in which each
transistor conducts current during opposite cycltes of the input signal? - Correct
Answer-Class B amplifier
Which class of amplifier has an output that is very high in harmonics that must be
attenuated by a filter network? - Correct Answer-class c amplifier
which class of amplifier efficiency approaches, but never achieves 100% - Correct
Answer-class D amplfier
if the power out of a transformer must equal the power in, assuming zero efficiency loss,
what happens to the output current when the transformed output voltage is 10% lower?
- Correct Answer-the current increases 10%
What is the voltage on the secondary of a transformer if the number of secondary
windings is 25% of the primary windings? - Correct Answer-25% of the voltage on the
transformer's primary.
Which type of rectifier circuit uses two alternating current (AC) waveforms on the
transformer secondary? - Correct Answer-A full-wave rectifier with a center-tapped
transformer secondary.
What term describes changes in output direct current (DC) voltage with changes in input
alternating current (AC) voltage expressed as a percentage? - Correct Answer-Input
regulation.
In a series-pass transistor regulator, which component isolates the Zener diode from
changes in the load for improved voltage regulation? - Correct Answer-The emitter
follower configured transistor (series-pass transistor).
In a feedback linear regulator, what enables a stable output voltage while enabling a
wide range of output current through the load? - Correct Answer-The current across the
Zener diode is constant.
What characteristic of foldback limiting circuitry protects equipment if the load is
accidentally shorted? - Correct Answer-The supplied voltage and current drops to near-
zero or zero when the maximum current limit is reached.
In a basic step-up switcher circuit design, what does the inductor do when the switch is
closed and conducting current to ground? - Correct Answer-It stores energy in its
magnetic field with the current lagging the voltage by 90 degrees
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