20 Tests

CDL Combination Vehicles Practice Test Online | Rhode Island 2021

Train for FREE online with our Rhode Island 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 RI combination license in 2021, practice as much as.. Read More

Train for FREE online with our Rhode Island 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 RI 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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1 . When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.

To test the trailer service brakes, you should first ensure that the braking system has a normal air pressure level, then release the parking brake. You should then move the vehicle forward slowly and apply the brakes with the hand control. If the trailer service brakes are working properly, you will feel the brakes activate.

2 . 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.

3 . When a combination vehicle goes around a corner:

When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called off-tracking. This effect is especially pronounced on vehicles with trailers.

4 . When the wheels of a trailer lock up:

A trailer may swing out and strike other vehicles if its wheels lock up. This is especially likely with lightly-loaded trailers.

5 . If the emergency air line loses pressure:

The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

6 . If color-coded, which color is used to identify emergency, or supply, lines?

Air lines are sometimes color-coded to help drivers avoid mistakes when coupling glad hands. Typically, blue is used for service lines and red is used for emergency lines.

7 . If a parked trailer does not have spring brakes, you should keep the trailer from moving by:

If a parked trailer does not have spring brakes, wheel chocks should be used to prevent it from moving.

Wait, before you go

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