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NCTI ROC II BOOK II FINAL Test 1 exam 2023 with 100% correct answers
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NCTI ROC II BOOK II FINAL Test 1When pressure testing a drop system to check for leakage, What must be done before applying the test
signal? - correct answer -The technician must isolate the drop system from the hybrid fiber/coax (HFC)
network by disconnecting the drop at the distribution tap.
Why do some leakage detection systems utilize a leakage carrier modulated with a tagging signal? -
correct answer -To avoid false detection of leaks.
When all three sections of a pulse code modulator (PCM) are combined, what function can be
performed? - correct answer -· As an analog-to-digital converter (ADC)
What prevents the subcarriers in orthogonal frequency division multiplexing (OFDM) from interfering
with each other? - correct answer -· The peak power of each subcarrier aligns with the minimum power
of the adjacent subcarrier.
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.
Which class of amplifier efficiency approaches, but never achieves, 100%? - correct answer -· Class D
amplifier.
What is the output waveform coming from a ferroresonant power supply? - correct answer -· A quasi-
square wave.
What instrument should be used to accurately measure the output voltage of a ferroresonant power
supply? - correct answer -· A true root mean square (RMS) digital multimeter (DMM)
What could a light dimmer with a silicon controlled rectifier (SCR) create in a customer premises? -
correct answer -· Radio frequency interference (RFI).
What is a characteristic of a bipolar junction transistor (BJT) common emitter configuration? - correct
answer -· The output signal is taken from the emitter.
, What is done to an operational amplifier (op amp) to create a low-pass filter circuit? - correct answer -·
A capacitor is placed in parallel with the feedback resistor that is connected to the op amp inverting
input (-).
What is the core objective of the Data Over Cable Service Interface Specification (DOCSIS) Provisioning
of Ethernet passive optical network (EPON), or DPOE, access architecture? - correct answer -· To make
the EPON elements appear and operate as DOCSIS elements to the existing DOCSIS-based back office
provisioning operations.
What benefit does a power-doubling configuration offer compared to a single cascade push-pull hybrid
amplifier? - correct answer -· Twice the output with the same distortion.
Which statement characterizes a distributed powering system? - correct answer -· Uses multiple
locations for power supply placement within the outside plant
What is done to an operational amplifier (op amp) to create a low-pass filter circuit? - correct answer -·
The number of inductors plus capacitances that are in a filter circuit
What is required for checking the physical network integrity when maintaining the coaxial cable
network? - correct answer -· Being observant and performing some minor tasks while engaged in
regularly scheduled activities.
Which type of map contains node information? - correct answer -· Design map.
Why is the term "gain control" applied to amplifier gain and controls inaccurate? - correct answer -· The
only way to vary the output of any amplifier is to adjust the amplitude level of the signal going into the
amplifier.
When activating a fiber-optic network, which acceptance testing stage includes adjusting attenuation
levels for the first time? - correct answer -· During equipment activation.
What is the thermal noise level used for reference in broadband cable noise calculations? - correct
answer -· -59.2 dBmV.
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