ND CDL Combination Practice Test (2024)

1. When uncoupling, after you unlock the fifth-wheel you should:

chock the trailer wheels.
pull the tractor clear of the trailer.
ease the pressure on the locking jaws.
pull the tractor partially clear of the trailer.

2. If driving a heavy vehicle, you should:

stay in the left lane.
try to pass other vehicles going uphill.
stay in the right lane.
avoid braking.

3. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:

supply air to the trailer system and lock the trailer brakes.
remove the wheel chocks.
connect the electrical cord and check the air lines.
begin raising the landing gear.

4. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.

1
7
3
2

5. Which of the following trailers can get stuck on raised crossings?

Lowboy
Moving van
Car carrier
All of the above.

6. If the ABS is not working:

the vehicle will have weak brakes.
the vehicle will have no brakes.
you still have normal brake functions.
None of the above.

7. As part of the final air brake check, you should:

Test low pressure warning signal.
Test air leakage rate.
Check air compressor governor cut-in and cut-out pressure.
All of the above.

8. 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.

9. If a trailer does not have spring brakes, to keep the trailer from moving you should:

use the service brakes.
use wheel chocks.
park on a slight decline.
close the brake valve.

10. How many red reflective triangles should you carry?

3
6
2
5

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

CDL COMBINATION PRACTICE TEST (ND)

ND CDL Combination Test