20 Tests

CDL Combination Vehicles Practice Test Online | Wisconsin 2021

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

Train for FREE online with our Wisconsin 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 WI 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 . Emergency air lines are often coded with the color:

Red. In general, the parts of the service air line are coded blue and the parts of the emergency air line are coded red.

2 . When backing up to couple a trailer, you should position the tractor:

At a 60-degree angle in front of the trailer. When backing up to couple a trailer, you should position the tractor directly in front of the trailer. Trying to couple while backing at an angle could cause the trailer to move and the landing gear to break.

3 . In a double or triple combination, the ____ trailer should be directly behind the cab.

When positioning trailers in a combination, the most heavily-loaded trailer should be the closest to the tractor. The lightest trailer should be positioned in the rear.

4 . A lightly-loaded combination vehicle will stop more slowly than a fully-loaded vehicle because:

The suspension springs only operate when a trailer reaches a minimum weight. An empty combination vehicle will come to a complete stop more slowly than a fully-loaded vehicle. The stiff suspension springs and strong brakes will have lower traction on a light trailer than they would if the vehicle carried more weight.

5 . If you cannot reverse your trailer in a straight path, you should:

If you need to back your trailer but cannot back up in a straight path, you should back on a curved path toward the driver's side of the vehicle. This will allow you the best possible visibility while backing.

6 . Which type of vehicle is most prone to the “crack-the-whip” effect?

A triple trailer Triple combination trailers are most vulnerable to the "crack-the-whip" effect.

7 . In a double or triple combination:

The weight of the trailers does not matter. When positioning trailers in a combination, the most heavily-loaded trailer should be the closest to the tractor. The lightest trailer should be positioned in the rear.

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