NCTI SERVICE TECHNICIAN QUESTIONS WITH CORRECT ANSWERS 2025

NCTI SERVICE TECHNICIAN: QUESTIONS
WITH CORRECT ANSWERS 2025
WhatWareWthreeWprincipleWcharacteristicsWthatWdefineWanWACWwaveform?W-WCORRECTWANSWERW-
TheWthreeWprincipleWcharacteristicsWthatWdefineWanWACWwaveformWare:W(1)Wfrequency;W(2)Wwavelength;W
andW(3)Wamplitude.



WhatWisWoneWofWtheWbasicWprinciplesWofWresistanceWreflectedWinWtheWfamiliarWpracticesWofWgroundingWan
dWbonding?W-WCORRECTWANSWERW-
GroundingWandWbondingWpracticesWreflectWtheWbasicWprincipleWthatWelectricityWalwaysWfollowsWtheWpathW
ofWleastWresistance.



WhatWcomprisesWtheWimpedanceWofWaWcoaxialWcableWorWaWdeviceW(connector,Wpassive,Wetc.)?W-
WCORRECTWANSWERW-

TheWimpedanceWcomprisesWtheWcombinedWeffectsWofWaWcoaxialWcable'sWorWaWdevice'sWresistance,Winduct
ance,WandWcapacitance.



WhatWisWaWhighWpassWfilter?W-WCORRECTWANSWERW-AWhigh-
passWfilterWisWaWtypeWofWbandpassWfilterWthatWpassesWallWfrequenciesWaboveWaWspecificWfrequencyW(e.g.,W
50WMHz),WandWeliminatesWcommonWpathWdistortions,WimpulseWnoiseWinWtheWreturnWspectrum,WandWanyW
otherWfrequenciesWthatWfallWbelowWthatWspecificWfrequency.



WhatWareWtheWdifferingWforward-pathWtransmissionWbandwidthsWforWtraditionalWtree-and-
branchWandWHFCWarchitectures?W-WCORRECTWANSWERW-TheWfeederWsystemWinWaWtraditionalWtree-and-
branchWarchitectureWsuppliesWtheWforwardWsignalWupWtoWaW50-
550WMHzWpassWband,WandWtheWdistributionWsystemWinWanWHFCWnetworkWtransmitsWtheWforwardWsignalWu
pWtoWaW50-1,000WMHzWpassWband.



WhereWdoesWtheWfeederWsystemWforwardWpathWstartWandWendWinWaWtree-and-branchWdesign?W-
WCORRECTWANSWERW-AWtree-and-

branchWfeederWsystemWforwardWpathWstartsWatWtheWoutputWofWtheWbridgerWamplifierWmoduleWinWtheWtru
nk/bridgerWamplifierWstationWandWendsWatWtheWtapWportWofWanWRFWtap.



WhereWdoesWtheWdistributionWsystemWforwardWpathWbeginWandWendWinWanWHFCWdesign?W-
WCORRECTWANSWERW-

AnWHFCWdistributionWsystemWforwardWpathWbeginsWatWtheWoutputWofWanWRFWamplifierWlocatedWinWtheWop
ticalWnodeWandWendsWatWtheWtapWportWofWanWRFWtap.

,WhatWisWtheWpurposeWofWaWcoaxialWexpressWcableWinWanWHFCWdistributionWsystem?W-
WCORRECTWANSWERW-

AWcoaxialWexpressWcableWallowsWaWparticularWopticalWnodeWtoWreachWfartherWoutWinWtheWdistributionWsyst
em.



HowWisWundergroundWcableWmanufactured?W-WCORRECTWANSWERW-
UndergroundWcableWisWmanufacturedWwithWaWprotectiveWouterWjacketWcoveringWtheWaluminumWsheathWa
ndWfloodingWcompoundWbetweenWtheWjacketWandWtheWsheath.



HowWdoWfrequencyWandWcableWsizeWaffectWtheWattenuationWofWaWbroadbandWsignal?W-
WCORRECTWANSWERW-

TheWattenuationWofWaWbroadbandWsignalWincreasesWwithWhigherWfrequenciesWandWdecreasesWwithWlarger
WcableWsize.




WhatWisWtheWroleWofWsplittersWandWdirectionalWcouplersWinWtheWforwardWandWreturnWpaths?W-
WCORRECTWANSWERW-

SplittersWandWdirectionalWcouplersWdivideWandWrouteWtheWforwardWRFWsignalWtransmissionWthroughoutWt
heWdistributionWsystem,WandWcombineWreturn-pathWsignalsWarrivingWfromWseparateWfeederWruns.



HowWisWACWpowerWtransmittedWinWanWRFWtap?W-WCORRECTWANSWERW-
ACWpowerWpassesWbidirectionallyWthroughWtheWtap,WbutWisWpreventedWfromWpassingWthroughWtoWtheWtap
WportsWexceptWbyWdesignWinWpower-distributingWtaps.




WhatWisWtheWdistinctionWbetweenWaWlineWextenderWamplifierWandWaWdistributionWamplifier?W-
WCORRECTWANSWERW-

TheWdistinctionWisWaWlineWextender,WwhichWhasWaWsingleWoutputWportWandWaWdistributionWamplifier,WorWm
inibridger,WwhichWhasWmultipleWoutputWportsW(typicallyWthreeWports;WaWthrough-
portWandWtwoWauxiliaryWoutputWports).



WhatWareWfiveWimportantWcomponentsWofWanWamplifierWstation?W-WCORRECTWANSWERW-
FiveWimportantWamplifierWstationWcomponentsWare:W(1)WinputWandWoutputWdiplexWfiltersWthatWseparateWa
ndWcombineWtheWforwardWandWreturnWpathsWwithinWtheWamplifier;W(2)WforwardWandWreturnWplug-
inWpadsWandWequalizersWforWcontrollingWtheWinputWsignalWlevels;W(3)WanWRFWamplifierWmodule;W(4)WanWint
egratedWorWstand-
aloneWDCWpowerWsupplyWwithWDCWcurrentWfusing;WandW(5)WACWpowerWdirectionWcontrol.

,WhatWfactorsWdefineWtheWextentWofWaWpowerWrealm?W-WCORRECTWANSWERW-
CableWresistance,WcombinedWamplifierWloadWrequirements,WindividualWamplifierWvoltageWminimums,Wand
WlimitsWonWACWcurrentWdefineWtheWextentWofWpowerWrealms.




WhatWareWtheWthreeWmainWcomponentsWofWaWtypicalWstandbyWpowerWsupply?W-WCORRECTWANSWERW-
TheWthreeWmainWcomponentsWofWaWstandbyWpowerWsupplyWare:W(1)WaWferroresonantWtransformerWthatWs
uppliesWtheWoutputWvoltage;W(2)WaWsetWofWbatteriesWactingWasWaWbackupWpowerWsource;WandW(3)WanWACWi
nverterWthatWconvertsWtheWDCWbatteryWbackupWpowerWtoWaW60WorW90WVACWoutput.



WhatWdoesWaWsignalWlevelWmeterW(SLM)Wmeasure?W-WCORRECTWANSWERW-
AnWSLMWmeasuresWindividualWanalogWvideoWandWaudio,WandWdigitalWcarrierWlevels.



WhatWdoesWaWdigitalWmultimeterW(DMM)Wmeasure?W-WCORRECTWANSWERW-
AWdigitalWmultimeterW(orWVOM)WmeasuresWACWandWDCWvoltages,WresistanceWforWcontinuityWchecks,WandW
current.



WhatWdoesWaWtimeWdomainWreflectometerW(TDR)Wmeasure?W-WCORRECTWANSWERW-
AWTDRWmeasuresWtheWpresenceWofWandWdistanceWtoWcableWfaults.



WhatWdoesWaWsignalWleakageWdetectorWmeasure?W-WCORRECTWANSWERW-
AWsignalWleakageWdetectorWisWanWRFWreceiverWwithWanWinstalledWinputWantennaWthatWmeasuresWbroadba
ndWcableWsignalsWleakingWfromWtheWsystemWwithinWFCCWassignedWaeronauticalWfrequencyWbands.



WhatWdoesWaWcombinationWSLM/leakageWdetectorWmeasure?W-WCORRECTWANSWERW-
AWcombinationWSLM/leakageWdetectorWincorporatesWtheWfeaturesWofWbothWanWSLMWandWaWsignalWleakag
eWdetector.



WhatWareWmeasurementWapplicationsWforWusingWSLMs,WDMMs,WTDRs,WleakageWdetectors,WandWcombinat
ionWleakageWdetectors?W-WCORRECTWANSWERW-
TheWmeasurementWapplicationsWinclude:W(1)WbalancingWamplifierW(bridger,Wdistribution,WandWlineWextend
er)WoutputWlevelsW(SLM);W(2)WverifyingWsystemWandWamplifierWpowerWsupplyWoperationW(DMM);W(3)Widen
tifyingWcutWorWdamagedWcableWspansW(TDR);W(4)WidentifyingWsourcesWofWingressW(signalWleakageWdetector
,WSLM);WandW(5)WmonitoringWandWmeasuringWsignalWleakageW(egress)WforWsystemWCLIWreportingW(combina
tionWSLM/leakageWdetector).

, WhatWisWtheWproperWtroubleshootingWtechnique?W-WCORRECTWANSWERW-
BeginWatWaWlocationWcommonWtoWallWknownWoutageWsites,WdivideWtheWareaWofWunknownWsignalWstatusWin
Whalf,WverifyWtheWsignalWcondition,WandWrepeatW(ifWnecessary)WuntilWtheWsourceWofWtheWproblemWisWfound

.



HowWcanWaWdistributionWsystemWdesignWmapWaidWtheWtroubleshootingWprocess,WafterWgatheringWasWmuc
hWinformationWasWpossibleWaboutWtheWextentWofWtheWaffectedWarea?W-WCORRECTWANSWERW-
AWsystemWdesignWmapWisWusedWtoWanalyzeWsystemWforWtheWdeviceWcommonWtoWtheWcustomersWsoWfarWaf
fectedWbeforeWtravelingWtoWmakeWadditionalWsignalWstatusWchecks.



WhatWareWsixWsourcesWofWoutagesWcausedWbyWpoweringWfailures?W-WCORRECTWANSWERW-
PoweringWfailuresWinclude:W(1)WaWutilityWpowerWfailure;W(2)WaWtrippedWutilityWbreaker;W(3)WspentWstandby
WbatteryWpower;W(4)WaWblownWdistributionWlegWfuse;W(5)WaWblownWamplifierWDCWpowerWsupplyWfuse;Wand

W(6)WaWcableWcenterWconductorWsuck-out.




WhatWareWthreeWgroupsWofWoutageWcausesWassociatedWwithWcutWorWdamagedWcables?W-
WCORRECTWANSWERW-

TheWoutageWgroupsWare:W(1)WcablesWcutWbyWundergroundWdiggingWequipmentW(aWbackhoe,WaWtrencher,Wa
Wpost-

holeWdigger,WaWshovel,Wetc);W(2)WaerialWcableWdamagedWbyWlightningWorWdownedWpowerWlines;WandW(3)Wd
ownedWaerialWcableWdueWtoWtrafficWaccidentsWorWsevereWweather.



HowWoftenWareWoutagesWcausedWbyWequipmentWfailures?W-WCORRECTWANSWERW-
OutagesWcausedWbyWequipmentWfailuresWgenerallyWoccurWlessWfrequentlyWthanWotherWoutageWcategories.



WhatWtasksWareWinvolvedWinWmaintainingWphysicalWplantWintegrityWwithinWtheWdistributionWsystem?W-
WCORRECTWANSWERW-

MaintainingWphysicalWplantWintegrityWinvolves:W(1)WcheckingWandWtighteningWlooseWconnectors,WhousingW
enclosures,WandWtapWfaceWplates;W(2)WlubricatingWpedestalWandWpowerWsupplyWpadlocksWperiodicallyWdur
ingWnormalWaccess;WandW(3)WsecuringWandWdocumentingWanyWbrokenWlashingWwireWtoWpreventWfurtherWd
eterioration.



WhatWdoesWeliminatingWaWdiscoveredWsignalWleakWaccomplish?W-WCORRECTWANSWERW-
EliminatingWaWdiscoveredWleakWavertsWaWpotentialWoutageWorWtroubleWcall.



WhatWareWsixWperformanceWchecksWinvolvedWinWmaintainingWpowerWsupplies?W-WCORRECTWANSWERW-
PowerWsupplyWperformanceWchecksWinclude:W(1)WACWinputWvoltage;W(2)WACWoutputWvoltage;W(3)WoutputW