Combination CDL Study Guide Exam.
You should not back a tractor under a trailer until the whole air system is: - CORRECT ANSWER At normal pressure
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...
You should not back a tractor under a trailer until the whole air system is: - CORRECT ANSWER At normal
pressure
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.
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
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 roll over. They are: (1) Keep the cargo as close to
the ground as possible; and (2): - CORRECT ANSWER Go slowly around turns.
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