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NC CDL Exam-Combination Vehicles Test Questions and Answers
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NC CDL Exam-Combination Vehicles Test Questions and Answers
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NC CDL Exam-Combination Vehicles Test Questions andAnswers
You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at
the right height when: Correct Answer-It will be raised slightly when the tractor is backed
under it.
You should not back a tractor under a trailer until the whole air system is: Correct Answer-
At normal pressure.
Which part of the kingpin should the locking jaws close around? Correct Answer-The
shank.
When you get ready to back under the semi-trailer you should line up: Correct Answer-
Directly in front of the trailer.
How should you test the tractor semi-trailer connection for security? Correct Answer-Pull
gently forward in low gear against the locked trailer brakes, then look at it carefully.
When should you use the hand valve to park a combination vehicle? Correct Answer-
Never.
, NC CDL Exam-Combination Vehicles Test Questions and
Answers
You supply air to the trailer tanks by: Correct Answer-Pushing in the trailer air supply
valve.
Why should you be sure that the fifth wheel plate is greased as required? Correct Answer-
To prevent steering problems.
After you supply air to the trailer, make sure the air lines are not crossed and the trailer
brakes are working. This is done by: Correct Answer-Applying and releasing the trailer
brakes and listening for brake sounds.
There are two things that a driver can do to prevent a rollover. They are: (1) Keep the cargo as
close to the ground as possible; and (2): Correct Answer-Go slowly around turns.
Before you back under a trailer, make sure the: Correct Answer-Trailer brakes are locked.
, NC CDL Exam-Combination Vehicles Test Questions and
Answers
If the service air line comes apart while you are driving a combination vehicle, but the
emergency line stays together, what will happen right away? Correct Answer-Nothing is
likely to happen until you try to apply the brakes.
The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than
___ PSI per minute. Correct Answer-4
In normal driving, some drivers use the hand valve before applying the brake pedal to prevent
a jackknife. Which of these statements is true? Correct Answer-If the trailer has not spring
brakes, you can drive away, but you will not have trailer brakes.
Why should you lock the tractor glad hands (or dummy couplers) to each other when you are
not towing a trailer? Correct Answer-It will keep dirt and water out of the lines.
For coupling to be completed, the safety catch for the fifth wheel locking lever must be:
Correct Answer-Over the locking lever.
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