Combination Vehicles Practice Test | California 2025 #2

Train for FREE online with our California 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 CA combination license in 2025, 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 17

Number of Tests 20

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

50-degree

180-degree

90-degree

When coupling, be sure to couple the proper glad hands. When glad hands are connected, the seals should be pressed together at a 90-degree angle.

2 . Keeping cargo low can:

Prevent a rollover.

Help you drive faster.

Make turns more dangerous.

Rollovers can happen when a combination vehicle is turned too quickly. To help prevent the risk of rollover, it is important to keep the vehicle's center of gravity low by loading cargo as close to the ground as possible.

3 . In a double or triple combination:

Cargo weight must be evenly distributed between all trailers.

The heaviest trailer should be positioned directly behind the cab.

The heaviest trailer should be positioned in the rear.

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 . If you press the tractor air supply control and your trailer's spring brakes do not release, you should:

Inspect the air line connections.

Activate the Anti-Lock Braking System.

Turn the engine off and on again.

It is important that all of a vehicle's equipment is in proper working condition before beginning a trip. If a trailer's spring brakes do not release when you push in the tractor air supply control, you should make sure the air line connections are properly attached and sealed.

5 . Before beginning a trip, you should:

Leave the service line valve open.

Remove the relay valves.

Close the emergency line valve.

Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves and listening for escaping air. Close both shut-off valves before beginning to drive.

6 . Combination vehicles need extra space on the road because they:

Drive more slowly than other commercial motor vehicles.

Are heavier than other commercial motor vehicles.

Need more space to turn and stop than other commercial motor vehicles.

Combination vehicles need more space on the road than other commercial vehicles because they are longer and need more space to turn and stop. It is especially important to properly manage space when you are operating a combination vehicle.

7 . After connecting the air lines to the trailer while coupling, you should:

Supply air to the trailer.

Chock the wheels.

Inspect the fifth wheel.

Correctly following the steps to couple and uncouple trailers is vital to safely operating a combination vehicle. After connecting the air lines to the trailer while coupling, you should supply air to the trailer.

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2025 California | Frequently Asked Questions

A CDL Class B license in California allows drivers to operate single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or tow a vehicle not heavier than 10,000 pounds. This includes buses, farm labor vehicles, and any vehicle towing a vehicle not exceeding a GVWR of 10,000 pounds.

A Class B CDL license in California allows the operation of single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or any such vehicle towing a vehicle not exceeding 10,000 pounds GVWR. This includes buses, dump trucks, delivery trucks, tow trucks, garbage trucks, and other similar vehicles.

To acquire a Class B CDL license in California, you must be at least 18 years old (21 for interstate driving), possess a valid non-commercial driver's license, pass a vision test, complete a medical examination, and successfully complete written and skills tests. You must also have a clean driving record and be able to demonstrate the ability to operate a Class B vehicle.

To qualify for a Class B CDL license in California, you must be at least 18 years old. However, you must be 21 years old or older to operate commercial vehicles across state lines or to transport hazardous materials or waste.

Yes, specific endorsements may be necessary for a Class B CDL license in California depending on the type of vehicle you plan to drive or cargo you plan to carry. For example, endorsements are required for passenger vehicles, school buses, tank vehicles, double/triple trailers, and for carrying hazardous materials.

The Class B CDL skills assessment in California includes three parts: pre-trip vehicle inspection, basic vehicle control, and on-road driving. You must show you can inspect your vehicle to ensure it's safe to drive, demonstrate that you can control the vehicle in various situations, and finally, drive safely in normal traffic conditions.

Class B CDL license holders in California are restricted to driving single vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, or towing a vehicle not heavier than 10,000 pounds. They cannot operate a Class A combination vehicle unless they have the appropriate endorsement.

Yes, it is possible. The California Department of Motor Vehicles (DMV) offers the written Class B CDL test in multiple languages, including Spanish. However, federal regulations require that all CDL holders understand English to a level that allows communication with the general public, comprehension of traffic signs and signals, and responses to official inquiries.

Yes, you can request accommodations for the Class B CDL written exam in California if you have a disability. The Department of Motor Vehicles (DMV) provides reasonable testing accommodations according to the Americans with Disabilities Act (ADA). This can include extended time, a quiet room, or a sign language interpreter. Contact your local DMV to discuss your needs and arrange accommodations.

Yes, you can retake the Class B CDL written test if you don't pass on your first attempt. In California, you're allowed three attempts to pass the written test within 12 months of paying the application fee. If you fail all three attempts, you must start the process over and pay a new application fee.