FREE CDL Combination Vehicles Practice Test Online | Washington 2024 Page 2 of 3

Train for FREE online with our Washington 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 WA combination license in 2021, practice as much as.. Read More

Train for FREE online with our Washington 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 WA combination license in 2021, 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.

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8 . How much space should be between the upper and lower fifth wheel?

Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.

9 . What is a bobtail tractor?

Tractors without semi-trailers are referred to as "bobtail tractors." Bobtail tractors are difficult to operate and drivers must exercise caution.

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

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.

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

Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. After connecting the air lines to the trailer while coupling, you should supply air to the trailer.

12 . When backing up your tractor while coupling it to a trailer, the trailer brakes should be:

Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. Before backing your tractor under the trailer while coupling, make sure your trailer brakes are locked.

13 . What does an Anti-Lock Braking System (ABS) do?

An Anti-Lock Braking System (ABS) helps prevent wheel lockup during hard braking. If ABS detects impending lockup, it reduces braking pressure to a safe level.

14 . A driver should test the tractor protection valve by:

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

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