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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. Dual tires:
are dangerous.
should come in contact with each other whenever possible.
should not come in contact with each other.
should always come in contact with each other.
2. The crack-the-whip effect:
the ends of some vehicles to drag.
can cause a vehicle to tilt.
can turn the trailer over.
can cause problems for drivers coming toward you.
3. Tests have shown that trucks with a high center of gravity are more likely to tip over, therefore you should:
distribute the cargo as low as possible.
put the lightest parts of the cargo under the heaviest parts.
distribute the cargo so the majority of the weight is on the steering axle.
All of the above.
4. Which of the following is NOT a step in backing up with a trailer?
Checking the outside mirrors on both sides frequently
Backing quickly when the path is straight
Looking at your line of travel before you begin
Backing slowly
5. Which of these statements about brakes is true?
To stop, the brake shoes and linings are pushed against the outside of the drum.
Brake fade does not result from excessive heat.
The lighter the vehicle, the more heat the brakes absorb to stop it.
None of the above.
6. When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
secured with enough air leaks for turns.
secured with enough slack for turns.
properly greased.
None of the above.
7. Before entering a curve, you should:
come to a complete stop.
increase your speed.
reduce your speed.
maintain your speed.
8. On front tires, tread should be at least:
4/16 inch
4/32 inch
2/32 inch
1/16 inch
9. You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
You should use the emergency break instead.
The brakes on the trailer wheels will not respond.
The brakes on the trailer wheels caused the skid in the first place.
You should use the service break instead.
10. If are being followed closely, you should:
increase your following distance.
flash your brake lights.
decrease your following distance.
change lanes quickly.
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CDL Combination Test (ND)

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