CDL COMBINATION VEHICLES QUESTIONS WITH CORRECT ANSWERS 2026

CDL COMBINATION VEHICLES QUESTIONS
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WITH CORRECT ANSWERS 2025
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When g h should g h you g h use g h the g h hand g h valve g h to g h park g h a g h combination g h vehicle? g h -
g h CORRECT g h ANSWER- ghnever




Which g h answer g h is g h correct g h for g h the g h air g h valves g h when g h testing g h the g h trailer g h service
g h brakes g h only? g h - ghCORRECT g h ANSWER-


Service g h Brake: g h off; g h Parking g h Brake: g h off; g h Trailer g h air g h supply: g h in g h / g h open; g h Trolly:
g h applied




You g h are g h coupling g h a g h semi g h trailer g h to g h your g h tractor g h but g h have g h not g h yet g h backed
g h under. g h The g h trailer g h is ghat g h the g h right g h height g h when: g h - g h CORRECT g h ANSWER-


It g h will g h be g h raised g h slightly g h when g h the g h tractor g h is g h backed g h under g h it.



How g h should g h you g h test g h the g h tractor g h trailer g h connection g h for g h security? g h - g h CORRECT
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 the g h coupling




Which g h answer g h is g h correct g h for g h the g h air g h valves g h when g h testing g h the g h trailer
g h spring/parking g h brakes g h onl ghy? g h - g h CORRECT g h ANSWER-


Service g h Brake: g h off; g h Parking g h Brake: g h off; g h Trailer g h air g h supply: g h out; g h Trolly: g h released



Your g h emergency g h air g h line g h breaks g h or g h gets g h pulled g h apart g h while g h you g h are g h driving.
g h The g h loss g h of g h press ghure g h will g h cause g h the: g h - g h CORRECT g h ANSWER-Emergency g h trailer


g h brakes g h to g h come g h on




You g h supply g h air g h to g h the g h trailer g h tanks g h by: gh- g h CORRECT
g h ANSWER- ghPushing g h in g h the g h trailer g h air g h supply g h valve.




There g h are g h two g h things g h that g h a g h driver g h can g h do g h to g h prevent g h a g h roll g h over. g h They g h are:
g h (1) g h keep g h the g h carg gho g h as g h close g h to g h the g h ground g h as g h possible; g h and g h (2): g h -


g h CORRECT g h ANSWER-Go g h slowly g h around g h turns.

, You g h are g h coupling g h a g h semi g h trailer g h to g h your g h tractor g h but g h have g h not g h yet g h backed
g h under. g h The g h trailer g h is ghat g h the g h right g h height g h when: g h - g h CORRECT g h ANSWER-


It g h will g h be g h raised g h slightly g h when g h the g h tractor g h is g h backed g h under g h it.



The g h fifth g h wheel g h locking g h lever g h is g h not g h locked g h after g h the g h jaws g h close g h around g h the
g h kingpin; g h this g h mea ghn: g h - g h CORRECT g h ANSWER-


The g h coupling g h is g h not g h right g h and g h should g h be g h fixed g h before g h driving g h the g h coupled g h unit



When g h backing g h your g h tractor g h under g h a ghtrailer, g h you g h should g h expect: g h - g h CORRECT
g h ANSWER- ghTrailer g h will g h be g h lifted g h slightly g h when g h the g h tractor g h backs g h under


g h it.




Before g h you g h start g h to g h uncouple, g h you g h must g h - g h CORRECT g h ANSWER-
Make g h sure g h the g h ground g h is g h solid g h and g h can g h support g h the g h weight g h of g h the g h trailer



During g h uncoupling, g h you g h should g h disconnect g h electrical g h cable g h and g h - g h CORRECT
g h ANSWER- ghHang g h it g h with g h the g h plug ghdown




As g h part g h of g h your g h vehicle g h in g h inspection g h test, g h if g h your g h vehicle g h is g h equipped g h with
g h air g h brakes g h and g h ha ghs gha ghtrailer, ghyou ghwill ghinspect ghthe ghair ghconnections ghbetween ghthe


ghtruck ghor ghtractor ghand ghthe ghtrailer. ghMake g h sure g h that g h the g h ghare g h locked g h in g h place


g h and g h free g h of g h damage g h or g h air g h leaks. g h -


CORRECT g h ANSWER-Glad g h hands



If g h your g h vehicle g h gets g h stuck g h on g h a g h railroad g h track, g h you g h should g h -
g h CORRECT g h ANSWER- ghGet g h away g h from g h your g h vehicle g h and g h call g h 911


g h or g h the g h posted g h emergency g h number




If g h your g h test g h of g h the g h tractor g h protection g h valve g h is g h successful, g h - g h CORRECT g h ANSWER-
The ghtractor ghprotection ghvalve ghcontrol gh(trailer ghair ghsupply ghcontrol) ghwill ghpop ghout ghor ghgo
ghfrom gh"nor ghmal" g h to g h "emergency"