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

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

Train for FREE online with our Oregon 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 OR 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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15 . When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:

When driving a vehicle with ABS, you should brake in the same manner as you would in a vehicle without ABS.

16 . The trailer hand valve should be used:

On slippery surfaces. The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid.

17 . Keeping cargo centered on a rig can:

A rollover is more likely if cargo is unevenly loaded in a rig. To help prevent a dangerous rollover, it is important to keep a load as centered on the rig as possible.

18 . Rearward amplification refers to:

Vehicles with trailers are vulnerable to rollover due to the "crack-the-whip" effect, which is caused by rearward amplification.

19 . When you are pulling a trailer, the air supply control lever should be in its ____ position.

Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.

20 . If a trailer begins to skid, it is best for the driver to:

If your trailer begins to skid, you should release the brakes to regain traction. The trailer will begin to straighten out once the wheels begin to grip the road again.

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