NCTI Service Technician: Think About it correctly answered to pass 2023
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NCTI Service Technician: Think About it correctly answered to pass 2023What are three principle characteristics that define an AC waveform? - correct answer The three principle characteristics that define an AC waveform are: (1) frequency; (2) wavelength; and (3) amplitude.
What is one of the ba...
what are three principle characteristics that defi
what is one of the basic principles of resistance
what comprises the impedance of a coaxial cable o
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NCTI Service Technician: Think About it
correctly answered to pass 2023
What are three principle characteristics that define an AC waveform? - correct answer The three
principle characteristics that define an AC waveform are: (1) frequency; (2) wavelength; and (3)
amplitude.
What is one of the basic principles of resistance reflected in the familiar practices of grounding and
bonding? - correct answer Grounding and bonding practices reflect the basic principle that electricity
always follows the path of least resistance.
What comprises the impedance of a coaxial cable or a device (connector, passive, etc.)? - correct answer
The impedance comprises the combined effects of a coaxial cable's or a device's resistance, inductance,
and capacitance.
What is a high pass filter? - correct answer A high-pass filter is a type of bandpass filter that passes all
frequencies above a specific frequency (e.g., 50 MHz), and eliminates common path distortions, impulse
noise in the return spectrum, and any other frequencies that fall below that specific frequency.
What are the differing forward-path transmission bandwidths for traditional tree-and-branch and HFC
architectures? - correct answer The feeder system in a traditional tree-and-branch architecture supplies
the forward signal up to a 50-550 MHz pass band, and the distribution system in an HFC network
transmits the forward signal up to a 50-1,000 MHz pass band.
Where does the feeder system forward path start and end in a tree-and-branch design? - correct answer
A tree-and-branch feeder system forward path starts at the output of the bridger amplifier module in the
trunk/bridger amplifier station and ends at the tap port of an RF tap.
Where does the distribution system forward path begin and end in an HFC design? - correct answer An
HFC distribution system forward path begins at the output of an RF amplifier located in the optical node
and ends at the tap port of an RF tap.
,What is the purpose of a coaxial express cable in an HFC distribution system? - correct answer A coaxial
express cable allows a particular optical node to reach farther out in the distribution system.
How is underground cable manufactured? - correct answer Underground cable is manufactured with a
protective outer jacket covering the aluminum sheath and flooding compound between the jacket and
the sheath.
How do frequency and cable size affect the attenuation of a broadband signal? - correct answer The
attenuation of a broadband signal increases with higher frequencies and decreases with larger cable size.
What is the role of splitters and directional couplers in the forward and return paths? - correct answer
Splitters and directional couplers divide and route the forward RF signal transmission throughout the
distribution system, and combine return-path signals arriving from separate feeder runs.
How is AC power transmitted in an RF tap? - correct answer AC power passes bidirectionally through the
tap, but is prevented from passing through to the tap ports except by design in power-distributing taps.
What is the distinction between a line extender amplifier and a distribution amplifier? - correct answer
The distinction is a line extender, which has a single output port and a distribution amplifier, or
minibridger, which has multiple output ports (typically three ports; a through-port and two auxiliary
output ports).
What are five important components of an amplifier station? - correct answer Five important amplifier
station components are: (1) input and output diplex filters that separate and combine the forward and
return paths within the amplifier; (2) forward and return plug-in pads and equalizers for controlling the
input signal levels; (3) an RF amplifier module; (4) an integrated or stand-alone DC power supply with DC
current fusing; and (5) AC power direction control.
What factors define the extent of a power realm? - correct answer Cable resistance, combined amplifier
load requirements, individual amplifier voltage minimums, and limits on AC current define the extent of
power realms.
What are the three main components of a typical standby power supply? - correct answer The three
main components of a standby power supply are: (1) a ferroresonant transformer that supplies the
,output voltage; (2) a set of batteries acting as a backup power source; and (3) an AC inverter that
converts the DC battery backup power to a 60 or 90 VAC output.
What does a signal level meter (SLM) measure? - correct answer An SLM measures individual analog
video and audio, and digital carrier levels.
What does a digital multimeter (DMM) measure? - correct answer A digital multimeter (or VOM)
measures AC and DC voltages, resistance for continuity checks, and current.
What does a time domain reflectometer (TDR) measure? - correct answer A TDR measures the presence
of and distance to cable faults.
What does a signal leakage detector measure? - correct answer A signal leakage detector is an RF
receiver with an installed input antenna that measures broadband cable signals leaking from the system
within FCC assigned aeronautical frequency bands.
What does a combination SLM/leakage detector measure? - correct answer A combination SLM/leakage
detector incorporates the features of both an SLM and a signal leakage detector.
What are measurement applications for using SLMs, DMMs, TDRs, leakage detectors, and combination
leakage detectors? - correct answer The measurement applications include: (1) balancing amplifier
(bridger, distribution, and line extender) output levels (SLM); (2) verifying system and amplifier power
supply operation (DMM); (3) identifying cut or damaged cable spans (TDR); (4) identifying sources of
ingress (signal leakage detector, SLM); and (5) monitoring and measuring signal leakage (egress) for
system CLI reporting (combination SLM/leakage detector).
What is the proper troubleshooting technique? - correct answer Begin at a location common to all
known outage sites, divide the area of unknown signal status in half, verify the signal condition, and
repeat (if necessary) until the source of the problem is found.
How can a distribution system design map aid the troubleshooting process, after gathering as much
information as possible about the extent of the affected area? - correct answer A system design map is
used to analyze system for the device common to the customers so far affected before traveling to make
additional signal status checks.
, What are six sources of outages caused by powering failures? - correct answer Powering failures include:
(1) a utility power failure; (2) a tripped utility breaker; (3) spent standby battery power; (4) a blown
distribution leg fuse; (5) a blown amplifier DC power supply fuse; and (6) a cable center conductor suck-
out.
What are three groups of outage causes associated with cut or damaged cables? - correct answer The
outage groups are: (1) cables cut by underground digging equipment (a backhoe, a trencher, a post-hole
digger, a shovel, etc); (2) aerial cable damaged by lightning or downed power lines; and (3) downed
aerial cable due to traffic accidents or severe weather.
How often are outages caused by equipment failures? - correct answer Outages caused by equipment
failures generally occur less frequently than other outage categories.
What tasks are involved in maintaining physical plant integrity within the distribution system? - correct
answer Maintaining physical plant integrity involves: (1) checking and tightening loose connectors,
housing enclosures, and tap face plates; (2) lubricating pedestal and power supply padlocks periodically
during normal access; and (3) securing and documenting any broken lashing wire to prevent further
deterioration.
What does eliminating a discovered signal leak accomplish? - correct answer Eliminating a discovered
leak averts a potential outage or trouble call.
What are six performance checks involved in maintaining power supplies? - correct answer Power supply
performance checks include: (1) AC input voltage; (2) AC output voltage; (3) output current (amperage)
draw; (4) individual battery voltages; (5) charging (float) voltages; and (6) standby switching capability.
When does alternating current change direction in the conductor? - correct answer Alternating current
changes direction (or alternates) in the conductor each time the potential difference applied to the ends
of the conductor changes (or alternates) its polarity.
Define an AC power source. - correct answer An AC power source is a potential difference in a circuit that
continually changes its polarity.
What term is used more commonly than "alternator" to describe an AC power source? - correct answer
AC generator" is the term used more commonly than "alternator" to describe an AC power source.
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