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

Usually require more skill to drive than single commercial vehicles.

Are usually shorter than single commercial vehicles.

Usually require less skill to drive than single commercial vehicles.

Usually require more skill to drive than single commercial vehicles.

Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.

A maximum of two inches of space

The tractor protection valve keeps air in the trailer's braking system should the trailer break away or develop a leak. A loss of air pressure in the emergency line will cause the tractor protection valve to open and the emergency trailer brakes to activate.

The tractor protection valve will close.

The service brakes will activate.

The tractor protection valve will close.

The rear trailer will detach from the combination.

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.

The front and rear wheels will move in different paths.

The vehicle must use at least two lanes.

The front and rear wheels will move in different paths.

It is best to allow the rear wheels to drive over the curb.

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.

Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.

Prevent air from escaping air brake systems.

Prevent air from entering air brake systems.

Override vehicles that are out of control.

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

8 . Combination vehicles:

9 . How much space should be between the upper and lower fifth wheel?

10 . If the emergency air line loses pressure:

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

12 . When a combination vehicle goes around a corner:

13 . Combination vehicles are usually:

14 . Shut-off valves:

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

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