CDL Combination Test (2024) - FREE Oklahoma Practice Test

1. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:

the parking brake should never used to slow the vehicle.
shifting into neutral may help slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.

2. To test the service brake:

gently try to pull forward with the trailer parking brake on, then release the brake.
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
push the brake pedal firmly while going about 5 mph.

3. Blocking and bracing are:

coupling devices used to connect the service air lines from the truck or tractor to the trailer.
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.

4. What can cause poor traction?

Overloading the truck.
Too little weight on the driving axles.
Too much weight on the steering axle.

5. When you drive a tractor-trailer combination with ABS, you should:

apply the trailer hand brake whe braking.
brake as you always have.
pump the brakes.

6. A vehicle inspection should be done in the same order each time:

because it is required by law.
so you are less likely to forget something.
because the report must be written in that order.

7. Which of the following is NOT a good rule for using turn signals?

Signal continuously until you have completed the turn.
Put your turn signal on after the turn.
Cancel your signal after you have turned.

8. It's very important to distribute the cargo so it is:

9. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.

10. The heavier the vehicle:

the less work the brakes must do to stop it.
the higher the center of gravity will be.
the more work the brakes must do to stop it.

COMBINATION PRACTICE TEST - OK CDL