Exam (elaborations)
NCTI Part 2 Exam With 100% Correct Answers 2023
- Course
- Institution
NCTI Part 2 Exam With 100% Correct Answers 2023
[Show more]
Seller
Follow
professoraxel
Reviews received
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller professoraxel. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $19.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
85169 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now