Never use the trailer hand valve while parking because doing so may release the air pressure from the braking system, releasing the brakes that are holding the vehicle in place. Instead, use the parking brake or wheel chocks.

Should never be used for parking.

Should always be used for parking.

Should only be used for parking on a downgrade.

Should never be used for parking.

Incorrect coupling and uncoupling of combination vehicles can have extremely dangerous consequences.

Be sure that you are coupling correctly.

You can assume all vehicles are the same.

Be sure that you are coupling correctly.

Cracks in the mounting are acceptable.

If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can check under the trailer for wheel speed sensors coming from the back of the brakes.

Check for wheel speed sensors coming from the back of the brakes.

Pump the air brakes to activate the ABS.

Look into the back of the fifth wheel.

Check for wheel speed sensors coming from the back of the brakes.

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.

If a vehicle is top-heavy, it is more likely to roll over. The weight of cargo should be positioned as low in a trailer as possible to minimize this risk.

Placed as low as possible inside a trailer.

Placed as high as possible inside a trailer.

Placed as low as possible inside a trailer.

Placed on the driver’s side of a trailer.

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

Train for FREE online with our New Mexico 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 NM 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 | New Mexico 2024 #1 Page 2 of 3

8 . The trailer hand valve:

9 . When coupling:

10 . Bobtail tractors are ____ to stop than tractors attached to full semitrailers.

11 . To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:

12 . Rearward amplification refers to:

13 . When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.

14 . To help prevent a rollover, cargo should be:

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