NC CDL COMBINATION VEHICLES QUESTIONS WITH CORRECT ANSWERS 2025

NC CDL COMBINATION VEHICLES QUESTIONS
WITH CORRECT ANSWERS 2025
YouMareMcouplingMaMsemi-
trailerMtoMyourMtractorMbutMhaveMnotMyetMbackedMunder,MtheMtrailerMisMatMtheMrightMheightMwhen:
M-MCORRECTMANSWER-ItMwillMbeMraisedMslightlyMwhenMtheMtractorMisMbackedMunderMit.




YouMshouldMnotMbackMaMtractorMunderMaMtrailerMuntilMtheMwholeMairMsystemMis:M-
MCORRECTMANSWER-AtMnormalMpressure.




WhichMpartMofMtheMkingpinMshouldMtheMlockingMjawsMcloseMaround?M-MCORRECTMANSWER-
TheMshank.



WhenMyouMgetMreadyMtoMbackMunderMtheMsemi-trailerMyouMshouldMlineMup:M-
MCORRECTMANSWER-DirectlyMinMfrontMofMtheMtrailer.




HowMshouldMyouMtestMtheMtractorMsemi-trailerMconnectionMforMsecurity?M-MCORRECTMANSWER-
PullMgentlyMforwardMinMlowMgearMagainstMtheMlockedMtrailerMbrakes,MthenMlookMatMitMcarefully.



WhenMshouldMyouMuseMtheMhandMvalveMtoMparkMaMcombinationMvehicle?M-MCORRECTMANSWER-
Never.



YouMsupplyMairMtoMtheMtrailerMtanksMby:M-MCORRECTMANSWER-
PushingMinMtheMtrailerMairMsupplyMvalve.



WhyMshouldMyouMbeMsureMthatMtheMfifthMwheelMplateMisMgreasedMasMrequired?M-
MCORRECTMANSWER-ToMpreventMsteeringMproblems.

, AfterMyouMsupplyMairMtoMtheMtrailer,MmakeMsureMtheMairMlinesMareMnotMcrossedMandMtheMtrailerMbr
akesMareMworking.MThisMisMdoneMby:M-MCORRECTMANSWER-
ApplyingMandMreleasingMtheMtrailerMbrakesMandMlisteningMforMbrakeMsounds.



ThereMareMtwoMthingsMthatMaMdriverMcanMdoMtoMpreventMaMrollover.MTheyMare:M(1)MKeepMtheMcarg
oMasMcloseMtoMtheMgroundMasMpossible;MandM(2):M-MCORRECTMANSWER-GoMslowlyMaroundMturns.



BeforeMyouMbackMunderMaMtrailer,MmakeMsureMthe:M-MCORRECTMANSWER-
TrailerMbrakesMareMlocked.



IfMtheMserviceMairMlineMcomesMapartMwhileMyouMareMdrivingMaMcombinationMvehicle,MbutMtheMeme
rgencyMlineMstaysMtogether,MwhatMwillMhappenMrightMaway?M-MCORRECTMANSWER-
NothingMisMlikelyMtoMhappenMuntilMyouMtryMtoMapplyMtheMbrakes.



TheMairMleakageMrateMforMaMcombinationMvehicleM(engineMoff,MbrakesMon)MshouldMnotMbeMmoreMt
hanM___MPSIMperMminute.M-MCORRECTMANSWER-4



InMnormalMdriving,MsomeMdriversMuseMtheMhandMvalveMbeforeMapplyingMtheMbrakeMpedalMtoMprev
entMaMjackknife.MWhichMofMtheseMstatementsMisMtrue?M-MCORRECTMANSWER-
IfMtheMtrailerMhasMnotMspringMbrakes,MyouMcanMdriveMaway,MbutMyouMwillMnotMhaveMtrailerMbrakes.



WhyMshouldMyouMlockMtheMtractorMgladMhandsM(orMdummyMcouplers)MtoMeachMotherMwhenMyouMa
reMnotMtowingMaMtrailer?M-MCORRECTMANSWER-ItMwillMkeepMdirtMandMwaterMoutMofMtheMlines.



ForMcouplingMtoMbeMcompleted,MtheMsafetyMcatchMforMtheMfifthMwheelMlockingMleverMmustMbe:M-
MCORRECTMANSWER-OverMtheMlockingMlever.




TheMfrontMtrailerMsupportsMareMupMandMtrailerMisMrestingMonMtheMtractor.MMakeMsure:M-
MCORRECTMANSWER-


ThereMisMenoughMclearanceMbetweenMtheMtractorMframeMandMtheMlandingMgear.