CDL COMBINATION VEHICLES TEST COMPLETE
COURSE STUDY GUIDE WITH THOROUGHLY CHECKED
ANSWERS AND HIGH-QUALITY NOTES DEVELOPED
FOR GUARANTEED UNDERSTANDING AND EXAM
CONFIDENCE
How should you test the tractor semi trailer combination for being properly coupled? -
CORRECT ANSWER-
Pull gently forward in low gear against the locked trailer brakes, then inspect your coupling.
When coupling to the trailer, how far do you back up before stopping the first time? -
CORRECT ANSWER-Until the fifth wheel plate just touches the trailer.
What do you check before backing under the trailer? - CORRECT ANSWER-
Make sure the trailer brakes are set.
Air lines on a combination vehicle are often colored to keep them from getting mixed up.
What color is the emergency line and what color is the service line? - CORRECT ANSWER-
Red and blue.
After you back up to the trailer and the fifth wheel plate touches the trailer, you set the tra
ctor park brake, get out and hook up the emergency and service air lines. Then what do yo
u do before backing under the trailer? - CORRECT ANSWER-
Supply air to the trailer system, then pull out the trailer air supply knob to fully set the trai
ler brakes.
What three things can you do to prevent rollovers? - CORRECT ANSWER-
Keep your load centered, keep the load as low in the trailer as possible, and go slow aroun
d turns.
How far do you raise the landing gear on your trailer? - CORRECT ANSWER-
, Crank it up as far as it will go.
COURSE STUDY GUIDE WITH THOROUGHLY CHECKED
ANSWERS AND HIGH-QUALITY NOTES DEVELOPED
FOR GUARANTEED UNDERSTANDING AND EXAM
CONFIDENCE
How should you test the tractor semi trailer combination for being properly coupled? -
CORRECT ANSWER-
Pull gently forward in low gear against the locked trailer brakes, then inspect your coupling.
When coupling to the trailer, how far do you back up before stopping the first time? -
CORRECT ANSWER-Until the fifth wheel plate just touches the trailer.
What do you check before backing under the trailer? - CORRECT ANSWER-
Make sure the trailer brakes are set.
Air lines on a combination vehicle are often colored to keep them from getting mixed up.
What color is the emergency line and what color is the service line? - CORRECT ANSWER-
Red and blue.
After you back up to the trailer and the fifth wheel plate touches the trailer, you set the tra
ctor park brake, get out and hook up the emergency and service air lines. Then what do yo
u do before backing under the trailer? - CORRECT ANSWER-
Supply air to the trailer system, then pull out the trailer air supply knob to fully set the trai
ler brakes.
What three things can you do to prevent rollovers? - CORRECT ANSWER-
Keep your load centered, keep the load as low in the trailer as possible, and go slow aroun
d turns.
How far do you raise the landing gear on your trailer? - CORRECT ANSWER-
, Crank it up as far as it will go.
