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.

Never use the trailer hand valve while operating your vehicle. Using the trailer hand valve while driving can cause your trailer to skid.

It will disconnect from the vehicle.

You will stop the vehicle too quickly.

Driving combination vehicles requires more skill than driving single commercial vehicles. Combinations are generally longer, generally heavier, and are more vulnerable to rollover.

More difficult to drive than single commercial vehicles.

Easier to drive than single commercial vehicles.

Lighter than single commercial vehicles.

More difficult to drive than single commercial vehicles.

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

Train for FREE online with our Missouri 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 MO 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 | Missouri 2024 #1 Page 2 of 3

8 . In an empty combination vehicle, the stiff suspension springs and strong brakes will have:

9 . When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.

10 . Rearward amplification refers to:

11 . The tractor protection valve:

12 . The trailer hand valve should not be used while you are driving because:

13 . Combination vehicles are usually:

14 . When glad hands are coupled, the seals should be pressed together at a ____ angle.

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