FREE Maine Combination Practice Test (2024)

1. Which of the following is NOT part of a trailer air line system?

2. Which of the following is NOT part of testing the tractor protection valve?

Charging the trailer air brake system.
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
Pulling forward slowly, then applying the trailer brakes.

3. When your vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called:

4. Which of the following is most likely to roll over?

5. When backing a tractor under a trailer, you should:

back at an angle.
always use the lowest reverse gear.
stop before when the kingpin is locked into the fifth wheel.

6. Before entering an intersection, make sure that:

there's enough room to get at least halfway across.
accelerate smoothly and change gears as necessary.
there is sufficient space to clear it.

7. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.

8. What can cause poor traction?

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

9. A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.

10. When you are uncoupling a loaded trailer, lower the landing gear until:

the tractor frame is under the trailer.
it makes firm contact with the ground.
makes contact with the ground, and leave the trailer off the fifth wheel.

CDL COMBINATION PRACTICE TEST MAINE