Combination vehicles are usually heavier and longer than single combination vehicles. Operating a combination vehicle requires a higher level of driving skill than operating a single commercial vehicle.

About the same level of skill as

If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because the application of brakes is what caused the wheels to lock in the first place.

Should not apply the trailer hand brake.

Should firmly apply the brakes.

Can straighten the trailer with the parking brake.

Cargo weight should be evenly distributed within a trailer to reduce the risk of a rollover. Do not place too much weight on one side of a trailer.

Loaded with most weight on the driver’s side of the trailer.

Placed near the rear of the trailer.

Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.

Prevent the vehicle from skidding.

If a vehicle has anti-lock brakes on just one axle, the driver will still have more control during braking than they would without any anti-lock brakes.

Will provide increased control in braking.

Will not make a difference in braking.

Will provide increased control in braking.

Will likely cause the air brakes to malfunction.

Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.

Prevent air from escaping air brake systems.

Prevent air from entering air brake systems.

Override vehicles that are out of control.

Combination Vehicles Practice Test | Kentucky 2024 #1

Train for FREE online with our Kentucky CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a KY combination license in 2024, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.

Number of Question 20

Passing Score 16

Number of Tests 20

Combination Vehicles Practice Test | Kentucky 2024 #1

1 . When coupling, after you've connected the air lines to the trailer, you should:

2 . Operating combination vehicles usually requires ____ operating single vehicles.

3 . If a trailer begins to jackknife, the driver:

4 . To prevent a rollover, cargo should be:

5 . Pushing in the trailer air supply control will:

6 . Having anti-lock brakes on only one axle:

7 . Shut-off valves:

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Combination Vehicles Practice Test | Kentucky 2024 #1

1 . When coupling, after you've connected the air lines to the trailer, you should:

2 . Operating combination vehicles usually requires ­­­­­____ operating single vehicles.

3 . If a trailer begins to jackknife, the driver:

4 . To prevent a rollover, cargo should be:

5 . Pushing in the trailer air supply control will:

6 . Having anti-lock brakes on only one axle:

7 . Shut-off valves:

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2 . Operating combination vehicles usually requires ____ operating single vehicles.