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Drivers who want to drive combination vehicles must pass the combination vehicles test. The North Dakota 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 Dakota CDL Manual. Take this practice test now to prepare for the actual ND CDL combination test!
1. You supply air to the trailer brake system by:
connecting the tractor service air line to the trailer service glad hand.
pulling out the trailer air supply valve.
pushing in the trailer air supply knob.
plugging the electrical cord into the trailer.
2. When inspecting the coupling, check that the safety latch is:
pushing against the kingpin.
in position over the locking lever.
in the "lock" position.
None of the above.
3. During your inspection, you should look into the fifth-wheel gap and check that the _________ are fully closed around the kingpin.
locking jaws
lug nuts
mounting bolts
couplings (U-joints)
4. Which of the following is NOT part of the procedure to stop a trailer skid?
Using the trailer hand brake to get traction back
Releasing the brakes
Not using the hand brake
Recognizing the skid
5. When you get ready to back under the semi-trailer, you should:
line up about 15 degrees off the line of the trailer.
back under the trailer at an angle to avoid pushing the trailer sideways.
line up the kingpin to engage the driver's side locking jaw first.
line up directly in front of the trailer.
6. You are driving a combination vehicle and must use your brakes to avoid a crash. You should:
use the parking brake.
brake lightly and hold the steering wheel firmly.
push the brake pedal as hard as you can and hold it there.
use stab braking or controlled braking.
7. Fully loaded rigs:
are much more likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
are less likely to roll over than empty rigs.
None of the above.
8. Tests have shown that trucks with a high center of gravity:
can roll over at the posted speed limit for a curve.
can roll over if the driver exceeds the posted speed limit for a curve.
are less likely to roll over when entering a curve.
can roll over if the driver slows down before entering a curve.
9. When inspecting the cargo, make sure it is:
piled up.
not overloaded.
secured properly for the first 50 miles after beginning a trip.
All of the above.
10. When should you use the hand valve to park a combination vehicle?
When parking downhill.
To park at loading docks.
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ND CDL Combination Test

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