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NC CDL Combination Vehicles: Questions & Complete Answers (Latest Update)
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NC CDL Combination Vehicles: Questions & Complete Answers (Latest Update)
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NC CDL Combination Vehicles: Questions & CompleteAnswers (Latest Update)
You are coupling a semi-trailer to your tractor but have not yet backed under,
the trailer is at the right height when: Right Ans - 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:
Right Ans - At normal pressure.
Which part of the kingpin should the locking jaws close around? Right Ans -
The shank.
When you get ready to back under the semi-trailer you should line up:
Right Ans - Directly in front of the trailer.
How should you test the tractor semi-trailer connection for security? Right
Ans - 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? Right
Ans - Never.
You supply air to the trailer tanks by: Right Ans - Pushing in the trailer air
supply valve.
Why should you be sure that the fifth wheel plate is greased as required?
Right Ans - 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: Right Ans - 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): Right Ans - Go
slowly around turns.
, Before you back under a trailer, make sure the: Right Ans - 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? Right
Ans - 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. Right Ans - 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? Right Ans -
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? Right Ans - 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: Right Ans - Over the locking lever.
The front trailer supports are up and trailer is resting on the tractor. Make
sure: Right Ans - 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: Right Ans - Trailer emergency brakes
to come on.
When backing under a tractor under a trailer you should expect: Right Ans
- 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? Right Ans - If the trailer has no spring brakes, you can drive away,
but you will not have trailer brakes.
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