CDL Combination Test (2024) - FREE Georgia Practice Test

1. When should you use the hand valve to park a combination vehicle?

2. 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.

3. When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:

4. A trailer jackknife is more likely to happen when the trailer is:

5. When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?

Pulling tractor forward until the fifth-wheel comes out from under the trailer.
Using the trailer handbrake to provide air to the service line.
Opening the emergency line shut-off valve at the rear of the last trailer.
Going to the rear of the rig.

6. If you must make an emergency stop, you should:

use the hand brake before the brake pedal.
apply the brakes as hard as you can to lock them.
brake in a way that will keep your vehicle in a straight line.
None of the above.

7. Blocking and bracing are:

driving techniques used to regain control when your drive wheels start to skid.
used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
None of the above.

8. When parking, you should choose a spot:

that requires backing up.
that allows you to pull forward when you leave.
that allows you do a walk around inspection.
All of the above.

9. If there is a cargo fire in a van or box trailer, you should:

keep the doors shut.
open the doors, especially if your cargo contains hazardous materials.
enlist the help of bystanders.
keep driving until you reach help.

10. When you back under a trailer:

make sure the trailer brakes are locked.
back the tractor slowly.
use lowest reverse gear.
All of the above.

COMBINATION PRACTICE TEST - GA CDL