CDL Combination Test (2024) - FREE Delaware Practice Test

1. When you park trailers without spring brakes, you should use wheel chocks:

to prevent overheating.
to prevent air from escaping.
to prevent the transmission from shifting up.
to keep the trailer from moving.

2. When a vehicle goes around a corner, the rear wheels:

follow a different path than the front wheels.
will lock up.
follow the same path as the front wheels.
will turn freely.

3. To be in the proper position for coupling, the fifth wheel should:

tilted up towards the rear of the tractor.
be level with the ground.
have its jaws closed around the shank of the kingpin.
be tilted down towards the rear of the tractor.

4. 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.
plug the electrical cord into the trailer and fasten the safety catch.
check that the trailer is locked onto the tractor by pulling the tractor gently forward while the trailer brakes are still locked.

5. If a load is 50 feet long, the minimum number of tie-downs required is:

6. If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:

the vehicle to slide back and forth.
the trailer emergency brakes to come on.
the springs to put on the brakes.
the trailer supply valve to open.

7. On any upgrade, gravity:

8. The posted speed limit:

may only be exceeded when driving in rural areas.
should never be exceeded.
is only a suggestion.
should only be exceeded when passing other vehicles.

9. _________ rigs are much more likely to roll over in an accident than _________ rigs.

10. When backing, as soon as you see the trailer getting off the proper path, you should:

turn the top of the steering wheel in the direction of the drift.
turn the top of the steering wheel in the opposite direction of the drift.
to keep a firm grip on the steering wheel and continue backing.
None of the above.

COMBINATION PRACTICE TEST - DE CDL