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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. Dollies with ABS are required to have a malfunction lamp:
on the rear.
on the right side.
on the front.
on the left side.
2. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:
keep from rolling back.
reduce the chance of the front wheels skidding.
prevent movement of cargo.
hold compressed air.
3. Before leaving your vehicle unattended, you should:
Apply the parking brake.
Remove the keys.
Chock the wheels.
All of the above.
4. If you smell exhaust fumes in the cab, you should:
wait for the next stop, then inspect your vehicle.
stop immediately.
open the windows.
remember to conduct a post-trip inspection.
5. Under a pressurized system, the radiator cap:
should always be cool.
should never be hot.
should be removed when the coolant is hot.
should never be removed until the system has cooled.
6. What is the proper following distance for a 50 foot truck traveling at 50 mph?
25 seconds
6 seconds
5 seconds
10 seconds
7. Blocking _______________ to keep it from sliding.
is used in the front, back, and/or sides of a piece of cargo
goes from the upper part of the cargo to the floor
is used only in the back of a piece of cargo
None of the above.
8. Which of the following is NOT part of checking the sliding fifth-wheel?
Checking that it is properly greased
Testing the tractor protection valve
Checking that the slide is not damaged or parts are missing
Checking that all locking pins are present and locked in place
9. Axle weight is:
the weight of all the axles added together.
the maximum safe weight your tires can carry at a specified pressure.
the value specified by the manufacturer as the loaded weight of one axle.
the weight transmitted to the ground by one axle or one set of axles.
10. When backing a truck you should:
look straight ahead.
always rely on your mirrors.
back and turn toward the right side.
get out and walk around the vehicle before you begin to back.
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CDL Combination Test (NC)

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