CDL COMBINATION VEHICLES TEST QUESTIONS WITH CORRECT ANSWERS 2026.

CDL COMBINATION VEHICLES TEST
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QUESTIONS WITH CORRECT ANSWERS 2025
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How g h should g h you g h test g h the g h tractor g h semi g h trailer ghcombination g h for g h being ghproperly
g h coupled? gh- ghCORRECT g h ANSWER-


Pull g h gently g h forward g h in g h low g h gear g h against g h the g h locked g h trailer g h brakes, g h then g h inspect
g h your g h coupling.




When g h coupling g h to g h the g h trailer, g h how g h far g h do g h you g h back g h up g h before g h stopping g h the
g h first g h time? g h - ghCORRECT g h ANSWER-Until g h the g h fifth g h wheel ghplate g h just g h touches g h the


g h trailer.




What g h do g h you g h check g h before g h backing g h under g h the g h trailer? g h - g h CORRECT
g h ANSWER- ghMake g h sure g h the g h trailer ghbrakes g h are ghset.




Air ghlines ghon gha ghcombination ghvehicle ghare ghoften ghcolored ghto ghkeep ghthem ghfrom ghgetting
ghmixed ghup. ghWhat ghcolor ghis ghthe ghemergency ghline ghand ghwhat ghcolor ghis ghthe ghservice ghline? gh-


ghCORRECT ghANSWER- g h Red g h and g h blue.




After g h you ghback ghup ghto g h the g h trailer g h and ghthe g h fifth ghwheel ghplate ghtouches g h the ghtrailer,
g h you ghset ghthe g h tra ghctor g h park g h brake, g h get g h out g h and g h hook g h up g h the g h emergency g h and


g h service g h air g h lines. g h Then g h what g h do g h yo ghu g h do g h before g h backing g h under g h the g h trailer?


g h - g h CORRECT g h ANSWER-


Supply g h air g h to g h the g h trailer g h system, g h then g h pull g h out g h the g h trailer g h air g h supply g h knob g h to
g h fully g h set g h the g h trai ghler g h brakes.




What g h three g h things g h can g h you g h do g h to g h prevent g h rollovers? g h - g h CORRECT g h ANSWER-
Keep g h your g h load g h centered, g h keep g h the g h load g h as g h low g h in g h the g h trailer g h as g h possible,
g h and g h go g h slow g h aroun ghd g h turns.




How g h far g h do g h you g h raise g h the g h landing g h gear g h on g h your g h trailer? g h -
g h CORRECT g h ANSWER- ghCrank g h it g h up g h as g h far g h as g h it g h will g h go.

, You g h have g h coupled g h with g h a g h semi g h trailer. g h In g h what g h position g h should g h you g h put g h the
g h landing g h gear g h befo ghre g h driving g h away? g h - g h CORRECT g h ANSWER-


Fully g h raised g h with g h the g h crank g h handle g h secured g h in g h its g h bracket.



When g h uncoupling, g h what g h could g h happen g h if g h you g h park g h the g h trailer g h at
g h an g h angle? g h - ghCORRECT g h ANSWER-You g h could g h do g h damage g h to g h the


g h landing g h gear g h and g h dolly g h legs.




Why g h should g h you g h lock g h the g h tractor g h glad g h hands g h together g h or g h couple g h them g h to g h the
g h dummy g h glad g h ha ghnds g h when g h bobtailing? g h - g h CORRECT g h ANSWER-It g h will g h keep g h dirt


g h and g h water g h out g h of g h the g h lines.




When g h backing g h under g h a g h trailer, g h you g h should g h expect g h the g h trailer g h to g h be g h lifted
g h slightly g h by g h the g h fifth ghwheel g h plate. gh- g h CORRECT g h ANSWER-True.




Before g h you g h begin g h coupling, g h you g h should g h check g h your g h travel g h path g h for g h obstacles g h and
g h hazards. g h - ghCORRECT g h ANSWER-True.




What g h should g h your g h air g h supply g h pressure g h gauge g h read g h before g h backing g h under
g h a g h trailer? g h - ghCORRECT g h ANSWER-100 g h - g h 125 g h psi.




In g h case g h of g h a g h jackknife g h situation, g h you g h can g h use g h your g h trailer g h hand g h valve g h to
g h apply g h trailer g h brakes g h t gho g h stop g h the g h trailer ghfrom g h skidding. g h - g h CORRECT g h ANSWER-


False.



Which g h knob g h do g h you g h actuate g h to g h supply g h air g h to g h your g h trailer? g h -
g h CORRECT g h ANSWER- ghPush g h in g h on g h the g h tractor g h protection g h valve g h knob,


g h which g h is g h the g h red g h knob.




Do g h combination g h vehicles g h take g h longer g h to g h stop g h when g h they g h are g h empty
g h or g h loaded? g h - ghCORRECT g h ANSWER-When g h they g h are g h empty.