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

The cause of the "crack-the-whip" effect.

The amount of noise projected to the rear of a vehicle.

The cause of the "crack-the-whip" effect.

The number of trailers that can be pulled by a tractor.

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

The vehicle will maintain steering.

The "crack-the-whip" effect is a result of rearward amplification. If not properly handled, a trailer can tip over due to rearward amplification.

The cause of the "crack-the-whip" effect.

The amount of noise projected to the rear of the vehicle.

The cause of the "crack-the-whip" effect.

The number of trailers that can be pulled by one tractor.

A tractor protection valve keeps air in a tractor or truck air brake system should the trailer break away or develop a bad leak. The valve will close automatically if the pressure drops to an unsafe level.

Keeps air in the truck braking system if the trailer develops a leak.

Ensures that oil adequately lubricates the engine.

Protects the tractor from exceeding a set speed.

Keeps air in the truck braking system if the trailer develops a leak.

When coupling air brake hoses, you should make sure the proper pairs of gland hands are connected. They are sometimes color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.

Make sure to couple the proper glad hands.

Only couple one set of glad hands.

It is best to leave one glad hand loose.

To help prevent a rig from rolling over, you should keep the weight of the cargo as close to the ground as possible when loading. You should also drive slowly around turns.

Driving on the shoulder of a road

Keeping the cargo as close to the ground as possible

Driving on the shoulder of a road

Combination Vehicles Practice Test | Vermont 2024 #1 Page 2 of 3

Train for FREE online with our Vermont 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 VT 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 | Vermont 2024 #1 Page 2 of 3

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

9 . Rearward amplification refers to:

10 . When the wheels of a trailer lock up:

11 . Rearward amplification refers to:

12 . The tractor protection valve:

13 . When coupling, you should:

14 . Which of the following will not help prevent a rig from rolling over?

See the exact questions that will be on the 2024 DMV exam.

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