CDL Combination Test (2024) - FREE Illinois Practice Test

1. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:

the coupling is not right and you should not drive until you get it fixed.
the parking brakes are on and your vehicle is safe to drive.
cargo is properly blocked.
the parking brakes are on and the wheels are chocked.

2. Combination vehicles _________ than single CMVs.

3. Banked curves:

are reserved for pedestrians.
can be taken at any speed.
should always be avoided.
have a safe "design speed".

4. Cargo should be properly covered:

to protect the weather from the cargo.
to protect people from spilled cargo.
to block your view or someone else’s.
All of the above.

5. When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:

secure the vehicle.
connect the electrical cord and check the air lines.
connect the air lines to the trailer.
make sure the area around the vehicle is clear and the trailer wheels are chocked.

6. To reduce the chance of rollover, you should:

place the cargo as high as possible inside the trailer.
distributed the cargo as low as possible inside the trailer.
put the lightest parts of the cargo under the heaviest parts.
None of the above.

7. The best way to recognize that your trailer has started to skid is:

by seeing it in your mirrors.
by hearing squeaking noises from the wheels.
by using retarders.
None of the above.

8. By pushing the trailer air supply control knob in, you:

supply the trailer with air.
supply the tires with air.
shut the air off and put on the trailer emergency brakes.
keeps air in the tractor or truck brake system.

9. If your brakes get wet, it can cause them:

10. Placards must be at least _____ inches square.

COMBINATION PRACTICE TEST - IL CDL