FREE IL CDL Combination Test - Practice Test 2024

1. When driving a combination vehicle, which of the following 2 things will help you prevent a rollover?

Keeping cargo near the ground and driving slowly on the highway.
Keeping the cargo near the ground and driving slowly around turns.
Keeping cargo near the center of the vehicle and driving slowly on turns.
Keeping cargo near the center of the vehicle and driving slowly on the highway.

2. You are coupling a tractor to a semi-trailer and have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should hook up:

the safety chain.
the landing gear.
the electrical service cable.
the emergency and service air lines.

3. If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.

4 seconds
1 seconds
3 seconds
2 seconds

4. If you unlock the pintle hook with the dolly still under the rear trailer:

the brakes could be damaged by the combined forces of the springs and the air pressure.
the dolly tow bar may fly up.
your vehicle might roll away.
steam and boiling water can spray under pressure.

5. Livestock:

should always be placed in the rear of the trailer.
can move around in a trailer and cause unsafe handling.
should never be kept bunched together.
should never be carried on a trailer.

6. If are being followed closely, you should:

decrease your following distance.
increase your following distance.
change lanes quickly.
flash your brake lights.

7. When backing a trailer, turn the wheel right to make the cab go ________ and the trailer go ________.

right; left
right; right
left; right
left; left

8. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:

the trailer is empty or lightly loaded.
the trailer is fully loaded.
the trailer is overloaded.
None of the above.

9. Which of the following is NOT part of testing the trailer service brakes?

Releasing the parking brakes.
Pushing in the trailer air supply knob.
Moving the vehicle forward slowly.
Checking for normal air pressure.

10. If the drive wheels start to skid:

accelerate slightly to regain control.
use the brakes to slow down.
push in the clutch to let them turn freely.
All of the above.

Number of questions:	20
Correct answers to pass:	16
Passing score:	80%

ILLINOIS CDL COMBINATION PRACTICE TEST

CDL Combination Test (IL)