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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 backing a tractor under a trailer:
the end of the kingpin will be even with the top of the fifth wheel.
you should lift the trailer off the fifth-wheel.
the trailer will be lifted slightly when the tractor backs under it.
the fifth-wheel will come out from under the trailer.
2. If you're feeling tired while driving you should:
eat something.
stop driving and get some rest.
drink coffee.
increase your speed to get to your destination quicker.
3. What are the two basic reasons for covering cargo?
To protect the cargo from pilferage and from weather.
To protect people from spilled cargo and the cargo from weather.
To protect the cargo from weather and to avoid littering.
To protect people from spilled cargo and the cargo from pilferage.
4. If your vehicle catches fire, you should pull over:
near other vehicles.
near trees.
in an open area.
at a service station.
5. When should you use chocks to park a trailer without spring brakes?
Only when parking uphill
Only when parking downhill
6. When checking the lights before driving:
you should turn off the engine.
the engine must be running.
you should check them from inside the vehicle.
make sure the parking brake is not set.
7. When coupling, you should:
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the trailer wheels are not chocked.
make sure the sliding fifth-wheel is locked.
make sure the trailer kingpin is bent.
8. During your inspection, you should look into the fifth-wheel gap and check that the _________ are fully closed around the kingpin.
locking jaws
mounting bolts
couplings (U-joints)
lug nuts
9. Which of these is more likely to rollover due to the "crack-the-whip" effect?
The last trailer of doubles
The last trailer of triples
5-axle tractor semitrailers
The front trailer of 65 ft. conventional doubles
10. Which of the following is NOT a good rule for using turn signals?
Signal continuously until you have completed the turn.
Put your turn signal on after the turn.
Cancel your signal after you have turned.
Signal well before you turn.
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NC CDL Combination Test

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