NC CDL Combination Vehicles Exam Questions With Verified Answers.
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Course
CDL
Institution
CDL
NC CDL Combination Vehicles Exam
Questions With Verified Answers.
You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at the
right height when: - answerIt will be raised slightly when the tractor is backed under it.
You should not back a tractor under a...
NC CDL Combination Vehicles Exam
Questions With Verified Answers.
You are coupling a semi-trailer to your tractor but have not yet backed under, the trailer is at the
right height when: - 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: - answer✔At normal
pressure.
Which part of the kingpin should the locking jaws close around? - answer✔The shank.
When you get ready to back under the semi-trailer you should line up: - answer✔Directly in
front of the trailer.
How should you test the tractor semi-trailer connection for security? - 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? - answer✔Never.
You supply air to the trailer tanks by: - answer✔Pushing in the trailer air supply valve.
Why should you be sure that the fifth wheel plate is greased as required? - 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: - 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): - answer✔Go slowly around turns.
Before you back under a trailer, make sure the: - 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? - 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. - 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? - 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? - 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: -
answer✔Over the locking lever.
The front trailer supports are up and trailer is resting on the tractor. Make sure: - answer✔There
is enough clearance between the tractor frame and the landing gear.
You have a major leak in the service line and you put on the brakes. Service air pressure will
escape and cause the: - answer✔Trailer emergency brakes to come on.
When backing under a tractor under a trailer you should expect: - answer✔Trailer will be lifted
slightly when the tractor backs under it.
The driver crosses the air lines when hooking up to an old trailer. What will happen? -
answer✔If the trailer has no spring brakes, you can drive away, but you will not have trailer
brakes.
You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should
you hook up before backing under the semi-trailer? - answer✔The emergency and service air
lines.
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The
emergency line is ____; the service line is ____. - answer✔Red, blue
Which of these statements is true? - answer✔"Bobtail" tractors can take longer to stop than a
combination vehicle loaded to the maximum gross weight.
After connecting the air lines, but before backing under the trailer, you should: - answer✔Supply
air to the trailer system, then pull out the air supply knob.
The hand valve should be used: - answer✔To test the trailer brakes.
The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than
___ PSI per minute. - answer✔3
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means
that: - answer✔The coupling is not right and should be fixed before driving the vehicle.
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