Combination Vehicles Practice Test | Ohio 2025 #2

Train for FREE online with our Ohio 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 OH 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 16

Number of Tests 20

1 . The emergency air line supplies air to the:

Relay valves.

Trailer air tanks.

Signal line.

The emergency air line (also known as the supply line) has two functions. The first is to supply air to the trailer air tanks, and the second is to control the emergency brakes on combination vehicles.

2 . Operating combination vehicles usually requires ____ operating single vehicles.

Less skill than

About the same level of skill as

More skill than

Combination vehicles are usually heavier and longer than single combination vehicles. Operating a combination vehicle requires a higher level of driving skill than operating a single commercial vehicle.

3 . If a trailer begins to jackknife, the driver:

Should not apply the trailer hand brake.

Should firmly apply the brakes.

Can straighten the trailer with the parking brake.

If a trailer begins to jackknife, you should release the brakes and allow the trailer wheels to regain traction with the road. Do not apply the trailer hand brake to attempt to straighten out the rig because the application of brakes is what caused the wheels to lock in the first place.

4 . The best way to recognize that your trailer has started to skid is by:

Seeing other drivers' faces.

Checking the trailer in your mirrors.

Feeling the trailer move.

The easiest way to become aware that your trailer has begun to jackknife is to observe it in your mirrors. Checking your trailer in your mirrors will also allow you to spot any skidding at the earliest possible moment.

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

It will disconnect from the vehicle.

You will stop the vehicle too quickly.

It can cause a skid.

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

6 . Look into the back of the fifth wheel:

While testing your air brakes.

If your vehicle begins to skid.

When inspecting a coupling.

While inspecting a coupling, you should go under the trailer and look into the back of the fifth wheel. Ensure that the fifth wheel jaws are secured around the shank of the kingpin.

7 . When you are pulling a trailer, the air supply control lever should be in its ____ position.

Emergency

Supply

Normal

Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.

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2025 Ohio | Frequently Asked Questions

To acquire a CDL Tank endorsement in Ohio, you need to have a valid Ohio CDL. You must pass the Tank Vehicle section of the Ohio CDL permit test. The test covers knowledge on inspecting tank vehicles, driving tank vehicles, and safe driving rules. Study materials can be found in the Ohio CDL Handbook.

To obtain a CDL Tank license in Ohio, you must already possess a valid Commercial Driver's License (CDL). Then you'll need to pass the Tank Vehicle endorsement test, which covers the special driving procedures and precautions related to operating a tank vehicle. Finally, you may also need to pass a skills test in a tank vehicle, depending on your state's requirements.

While Ohio does not mandate specific training or experience to obtain a CDL Tank endorsement, it's highly recommended. You must pass the Tank Vehicle endorsement test, which requires understanding the unique operations of tank vehicles. Many applicants find training courses or experience driving these vehicles beneficial in successfully passing the test.

Yes, in Ohio, to obtain a CDL Tank endorsement, you must pass the Tank Vehicle endorsement test. This written test focuses on the operation and safety considerations specific to tank vehicles. The topics include inspecting tank vehicles, driving tank vehicles, and safe driving rules related to these types of vehicles.

The written test for the CDL Tank endorsement in Ohio covers topics such as inspecting tank vehicles, driving tank vehicles, safe driving rules, handling emergencies, and understanding the different types of tanks. It also includes questions about the special requirements for loading and unloading tank vehicles.

The CDL Tank endorsement assessment doesn't involve practical driving skills or maneuvers. Instead, it's a written test focusing on theoretical knowledge. Subjects include understanding high center of gravity, surge, inspecting tank vehicles, special driving rules and procedures, and handling emergencies specific to tank vehicles.

Drivers with a CDL Tank endorsement must adhere to all federal and state regulations for commercial drivers, including hours of service limitations. They must also follow specific rules for transporting liquids, such as weight restrictions and handling procedures. Additionally, if a driver's tank vehicle carries hazardous materials, they need a HazMat endorsement in addition to the Tank endorsement.

No, it's illegal to transport liquid or gaseous materials in a tank vehicle without a valid CDL Tank endorsement. This rule applies to commercial vehicles that have a tank with a capacity of 1,000 gallons or more. Violating this rule can result in fines, CDL disqualification, or even criminal charges depending on the severity of the violation.

The CDL Tank endorsement can be added to your existing CDL. You don't need to apply for a new license. However, you'll need to pass the Tank Vehicle written test. Once you pass, the endorsement will be added to your CDL, and you can legally operate tank vehicles. Please check with your local DMV for specific procedures and fees.

Yes, handling hazardous materials requires not only a CDL Tank endorsement but also a HazMat endorsement. This entails passing a written test and a federal background check. It's essential to understand specific regulations for transporting hazardous materials including proper loading, unloading, and emergency handling procedures to ensure safety on the road.