NCTI ROC II BOOK II Final Test 1
Questions And Answers
When 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.
, NCTI ROC II BOOK II Final Test 1
Questions And Answers
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.
Questions And Answers
When 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.
, NCTI ROC II BOOK II Final Test 1
Questions And Answers
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.
