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Drivers who want to drive combination vehicles must pass the combination vehicles test. The North Carolina CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the North Carolina CDL Manual. Take this practice test now to prepare for the actual NC CDL combination test!
1. When you are uncoupling a loaded trailer, lower the landing gear until:
the pressure in the system is above 55 psi.
makes contact with the ground, and leave the trailer off the fifth wheel.
the tractor frame is under the trailer.
it makes firm contact with the ground.
2. When parking, you should choose a spot:
that allows you do a walk around inspection.
that requires backing up.
that allows you to pull forward when you leave.
All of the above.
3. Inspecting the fifth-wheel does NOT include:
making sure that the fifth wheel is in the proper position for coupling.
backing until the fifth-wheel just touches the trailer.
checking that there are no cracks in the frame.
checking for missing or damaged parts.
4. Emergency brakes must be must be held on by:
mechanical force.
the locking mechanism.
air pressure.
5. During a walk around inspection of a combination vehicle, drivers should check that:
the glide plate is securely mounted to the trailer frame.
all locking pins are present and locked in place.
the locking jaws are around the shank.
All of the above.
6. _________ can make vehicle handling unsafe.
Poor weight balance
Poor ventilation
Dry roads
7. After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
50 miles
25 miles
two hours
20 miles
8. If you feel drowsy while driving, what should you do?
Pull off the road and get some sleep.
Eat heavy foods.
Get an energy drink.
Turn on the radio to keep you awake.
9. Blocking and bracing are:
used to keep cargo from sliding and to prevent movement of cargo.
driving techniques used to regain control when your drive wheels start to skid.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
None of the above.
10. You are inspecting your vehicle during a trip. What should you do?
Check critical items such as tires, brakes, and lights.
Watch gauges for signs of trouble.
Use your senses to check for problems.
All of the above.
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NC CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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