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NC CDL Combination Vehicles Questions and Correct Answers the Latest Update and Recommended Version
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NC CDL Combination Vehicles Questions and Correct AnswerNC CDL Combination Vehicles Questions and Correct Answers the Latest Update and Recommended Versions the Latest Update and Recommended Version

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  • November 2, 2024
  • 14
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • nc cdl combination vehicles questions and correct

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  • NC CDL Combination Vehicles
  • NC CDL Combination Vehicles

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NC CDL Combination Vehicles Questions
and Correct Answers the Latest Update
and Recommended Version
You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at

the right height when:

✓ 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:

✓ At normal pressure.



Which part of the kingpin should the locking jaws close around?

✓ The shank.



When you get ready to back under the semi-trailer you should line up:

✓ Directly in front of the trailer.



How should you test the tractor semi-trailer connection for security?

✓ 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?

✓ Never.



You supply air to the trailer tanks by:

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✓ Pushing in the trailer air supply valve.



Why should you be sure that the fifth wheel plate is greased as required?

✓ 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:

✓ 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):

✓ Go slowly around turns.



Before you back under a trailer, make sure the:

✓ Trailer brakes are locked.



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?

✓ 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.




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