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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. Weight that is loaded so there is a high center of gravity:
makes a vehicle easier to handle.
reduces the chance that the load will shift to the side or fall off.
causes greater chance of rollover.
All of the above.
2. What can cause poor traction?
Too little weight on the driving axles.
Overloading the truck.
Too much weight on the steering axle.
All of the above.
3. Most heavy-duty vehicles use:
hydraulic brakes.
pressure brakes.
air brakes.
solid brakes.
4. If you have convex mirrors, be aware that:
objects may appear to be faster than they really are.
everything appears smaller in a convex mirror than it would if you were looking at it directly.
in a convex mirror objects appears larger than they really are.
objects seem closer than they really are.
5. If you get stuck on railroad tracks, you should:
stay in the vehicle and call for help.
have a helper push your vehicle.
get out of the vehicle and away from the tracks.
check the engine compartment quickly.
6. To test the tractor-semitrailer connection for security:
pull out the air supply knob.
go under the trailer and look into the back of the fifth-wheel.
check that the trailer is locked onto the tractor by pulling the tractor gently forward while the trailer brakes are still locked.
plug the electrical cord into the trailer and fasten the safety catch.
7. If a vehicle is equipped with ABS, when you start the engine:
the wheels will lock up.
the ABS indicator light on the dash should come on and then turn off.
the spring brakes will come on.
the trailer emergency brakes will come on.
8. If your truck catches fire, the first thing you should do is to:
pull off the road and park in an open area.
pull into a service station and call for help.
get off the vehicle, open the hood and start shooting foamĀ to keep the engine cool.
get the vehicle off the road and park near other vehicles.
9. After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
shutting the engine off so you can hear the brakes.
applying and releasing the trailer brakes and listening for the sound of trailer brakes.
checking the air brake system pressure gauge for signs of major air loss.
All of the above.
10. The iron trailer supports are up, and the full weight of the trailer is resting on the tractor. Make sure:
the safety latch is not engaged.
you are in a low enough gear.
there is enough clearance between the upper and lower fifth wheel.
there is enough clearance between the rear of the tractor frame and the landing gear.
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ND CDL Combination Test

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