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NCTI ROC II BOOK II FINAL TEST 1
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NCTI ROC II BOOK II FINAL TEST 1
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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? - 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? - Answer- To avoid false detection of leaks.
When all three sections of a pulse code modulator (PCM) are combined, what function
can be performed? - Answer- · As an analog-to-digital converter (ADC)
What prevents the subcarriers in orthogonal frequency division multiplexing (OFDM)
from interfering with each other? - 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)?
- 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%? - Answer- ·
Class D amplifier.
What is the output waveform coming from a ferroresonant power supply? - Answer- · A
quasi-square wave.
What instrument should be used to accurately measure the output voltage of a
ferroresonant power supply? - 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? - Answer- · Radio frequency interference (RFI).
What is a characteristic of a bipolar junction transistor (BJT) common emitter
configuration? - 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? -
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? - Answer- · To make the EPON elements appear and operate as DOCSIS
elements to the existing DOCSIS-based back office provisioning operations.
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