CDL COMBINATION TEST QUESTIONS
WITH CORRECT ANSWERS 2025
IfMyouMcrossMconnectMtheMtwoMairMlinesMtheMfollowingMwillMresultM-MCORRECTMANSWER-
YouMwillMnotMhaveMairMgoingMtoMtheMtrailerMbrakes
YouMhaveMcoupledMwithMaMsemi-
trailer.MInMwhatMpositionMshouldMyouMputMtheMfrontMtrailerMsupportsMbeforeMdrivingMaway?M-
MCORRECTMANSWER-FullyMraisedMwithMtheMcrankMhandleMsecuredMinMitsMbracket
ThMtrailerMairMsupplyMcontrol:M-MCORRECTMANSWER-IsMaMred,MeightMsidedMknob
AMdeviceMwhichMconnectsMtheMserviceMandMemergencyMairMlinesMfromMtheMtruckMtoMtheMtrailerMis
Mcalled..M-MCORRECTMANSWER-GladMhands
IfMoneMofMtheMgladMhandsMonMyourMblueMairMlineMisMmissingMaMseal:M-MCORRECTMANSWER-
YouMmightMendMupMwithMaMserviceMlineMairMleak
InMorderMtoMsupplyMairMtoMtheMtrailer,MyouMmustMfirst:M-MCORRECTMANSWER-
StopMengineMsoMyouMcanMhearMtheMbrakes
TheMhandMvalveMshouldMbeMused:M-MCORRECTMANSWER-ToMtestMtheMtrailerMbrakes
TheMairMleakageMrateMforMaMcombinationMvehicleM(engineMoff,MbrakesMon)MshouldMnotMbeMmoreMt
hanM_______MpsiMperMminuteM-MCORRECTMANSWER-4
WhenMshouldMyouMuseMtheMhandMvalveMtoMparkMaMcombinationMvehicle?M-MCORRECTMANSWER-
Never
, WhenMyouMgetMreadyMtoMbackMunderMtheMsemi-trailerMyouMshouldMlineMupM-MCORRECTMANSWER-
DirectlyMinMfrontMofMtheMtrailer
IfMtheMserviceMairMlineMcomesMapartMwhileMyouMareMdrivingMaMcombinationMvehicleMbutMtheMemer
gencyMlineMstaysMtogether,MwhatMwillMhappenMrightMawayM-MCORRECTMANSWER-
NothingMisMlikelyMtoMhappenMuntilMyouMtryMtoMapplyMtheMbrakes
WhenMuncoupling,MifMyouMparkMtheMtrailerMatManMangle...M-MCORRECTMANSWER-
YouMcouldMdoMdamageMtoMtheMlandingMgear
WhichMofMtheseMstatementsMisMtrue?M-MCORRECTMANSWER-
"Bobtail"MtractorsMcanMtakeMlongerMtoMstopMthanMaMcombinationMvehicleMloadedMtoMtheMmaximu
mMgrossMweight
InMnormalMdriving,MsomeMdriversMuseMtheMhandMvalveMbeforeMapplyingMtheMbrakeMpedalMtoMprev
entMaMjackknife.MWhichMofMtheseMstatementsMisMtrue?M-MCORRECTMANSWER-
ItMshouldMnotMbeMdone
WhenMyouMinspectMtheMcoupling,McheckMtoMensureMthat:M-MCORRECTMANSWER-
There'sMaMlittleMslackMinMtheMairMlines
WhenMbackingMunderMaMtractorMunderMaMtrailerMyouMshouldMexpect:M-MCORRECTMANSWER-
TrailerMwillMbeMliftedMslightlyMwhenMtheMtractorMbackMunderMit
AMkingMpinMis:M-MCORRECTMANSWER-
AMpinMwhichMlocksMtheMtrailerMtoMtheMtractorMonMtheMfifthMwheel
TheMsafetyMcatchMforMtheMfifthMwheelMlockingMlevelMmustMbeM______MforMaMcouplingMtoMbeMcomp
lete.M-MCORRECTMANSWER-OverMtheMlockingMlever
WITH CORRECT ANSWERS 2025
IfMyouMcrossMconnectMtheMtwoMairMlinesMtheMfollowingMwillMresultM-MCORRECTMANSWER-
YouMwillMnotMhaveMairMgoingMtoMtheMtrailerMbrakes
YouMhaveMcoupledMwithMaMsemi-
trailer.MInMwhatMpositionMshouldMyouMputMtheMfrontMtrailerMsupportsMbeforeMdrivingMaway?M-
MCORRECTMANSWER-FullyMraisedMwithMtheMcrankMhandleMsecuredMinMitsMbracket
ThMtrailerMairMsupplyMcontrol:M-MCORRECTMANSWER-IsMaMred,MeightMsidedMknob
AMdeviceMwhichMconnectsMtheMserviceMandMemergencyMairMlinesMfromMtheMtruckMtoMtheMtrailerMis
Mcalled..M-MCORRECTMANSWER-GladMhands
IfMoneMofMtheMgladMhandsMonMyourMblueMairMlineMisMmissingMaMseal:M-MCORRECTMANSWER-
YouMmightMendMupMwithMaMserviceMlineMairMleak
InMorderMtoMsupplyMairMtoMtheMtrailer,MyouMmustMfirst:M-MCORRECTMANSWER-
StopMengineMsoMyouMcanMhearMtheMbrakes
TheMhandMvalveMshouldMbeMused:M-MCORRECTMANSWER-ToMtestMtheMtrailerMbrakes
TheMairMleakageMrateMforMaMcombinationMvehicleM(engineMoff,MbrakesMon)MshouldMnotMbeMmoreMt
hanM_______MpsiMperMminuteM-MCORRECTMANSWER-4
WhenMshouldMyouMuseMtheMhandMvalveMtoMparkMaMcombinationMvehicle?M-MCORRECTMANSWER-
Never
, WhenMyouMgetMreadyMtoMbackMunderMtheMsemi-trailerMyouMshouldMlineMupM-MCORRECTMANSWER-
DirectlyMinMfrontMofMtheMtrailer
IfMtheMserviceMairMlineMcomesMapartMwhileMyouMareMdrivingMaMcombinationMvehicleMbutMtheMemer
gencyMlineMstaysMtogether,MwhatMwillMhappenMrightMawayM-MCORRECTMANSWER-
NothingMisMlikelyMtoMhappenMuntilMyouMtryMtoMapplyMtheMbrakes
WhenMuncoupling,MifMyouMparkMtheMtrailerMatManMangle...M-MCORRECTMANSWER-
YouMcouldMdoMdamageMtoMtheMlandingMgear
WhichMofMtheseMstatementsMisMtrue?M-MCORRECTMANSWER-
"Bobtail"MtractorsMcanMtakeMlongerMtoMstopMthanMaMcombinationMvehicleMloadedMtoMtheMmaximu
mMgrossMweight
InMnormalMdriving,MsomeMdriversMuseMtheMhandMvalveMbeforeMapplyingMtheMbrakeMpedalMtoMprev
entMaMjackknife.MWhichMofMtheseMstatementsMisMtrue?M-MCORRECTMANSWER-
ItMshouldMnotMbeMdone
WhenMyouMinspectMtheMcoupling,McheckMtoMensureMthat:M-MCORRECTMANSWER-
There'sMaMlittleMslackMinMtheMairMlines
WhenMbackingMunderMaMtractorMunderMaMtrailerMyouMshouldMexpect:M-MCORRECTMANSWER-
TrailerMwillMbeMliftedMslightlyMwhenMtheMtractorMbackMunderMit
AMkingMpinMis:M-MCORRECTMANSWER-
AMpinMwhichMlocksMtheMtrailerMtoMtheMtractorMonMtheMfifthMwheel
TheMsafetyMcatchMforMtheMfifthMwheelMlockingMlevelMmustMbeM______MforMaMcouplingMtoMbeMcomp
lete.M-MCORRECTMANSWER-OverMtheMlockingMlever