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NC CDL Combination Vehicles Exam Questions and Answers (Latest Update 2024)
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NC CDL Combination Vehicles Exam Questions and Answers (Latest Update 2024)
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NC CDL Combination Vehicles ExamQuestions and Answers (Latest Update
2024)
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.
,NC CDL Combination Vehicles Exam
Questions and Answers (Latest Update
2024)
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
rollover. They are: (1) Keep the cargo as close to the ground
as possible; and (2): - Correct Answer ✅ Go slowly around
turns.
, NC CDL Combination Vehicles Exam
Questions and Answers (Latest Update
2024)
Before you back under a trailer, make sure the: - Correct
Answer ✅ 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? - 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? -
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