Combination Vehicles Practice Test | Massachusetts 2025 #2

Train for FREE online with our Massachusetts 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 MA 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 . Failure to keep the fifth wheel plate properly greased could:

Cause the trailer to disconnect.

Cause steering problems.

Cause braking problems.

Affect the lights.

Failure to keep the fifth wheel plate properly lubricated can create friction between the tractor and trailer, causing steering problems.

2 . If a trailer begins to skid, the driver should:

Lock the brakes.

Release the brakes.

Steer in the opposite direction.

Accelerate.

If your trailer starts to skid while you are braking, you should release the brakes and allow them to begin to regain traction. Once its wheels have regained their grip on the road, the trailer will begin to straighten out and follow the tractor.

3 . When a combination vehicle goes around a corner:

The turn should be made as tightly as possible.

The front and rear wheels move in different paths.

The rear wheels should run over the curb.

It is acceptable for street signs to be knocked over if they are too close to the road.

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.

4 . A shut-off valve:

Is located on the front of a trailer.

Is located on the instrument panel.

Prevents air from escaping an air brake system.

Should always be open.

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.

5 . In a combination rig, it is best to make:

Quick, sudden stops.

Sharp turns.

Quick accelerations.

Slow, planned stops.

When driving a combination vehicle, it is important to brake well in advance and look far ahead of your vehicle to avoid the need for sudden stops. Making habits of these actions will help you prevent your trailer from jackknifing.

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

Supply air to the trailer.

Chock the wheels.

Inspect the fifth wheel.

Connect the electrical cord.

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.

7 . Test the tractor protection valve by:

Removing the air supply knob.

Removing the parking brake control knob.

Releasing air with the brake pedal.

Releasing air with the gas pedal.

You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

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2025 Massachusetts | Frequently Asked Questions

To secure a CDL Bus endorsement in Massachusetts, you must first have a valid Commercial Driver's License (CDL). Then, you need to pass the Passenger Vehicles (P) and School Bus (S) endorsement knowledge tests. After passing the tests, you must also pass a skills test in a vehicle representative of the class and type you will be driving.

To obtain a CDL Bus License in Massachusetts, you must have a valid driver's license and pass the CDL general knowledge test. You also need to pass the Passenger Transport test and the School Bus endorsement test if applicable. Finally, you must successfully complete a skills test in an appropriate vehicle. You must be at least 18 years old and meet medical requirements.

Yes, specific training is necessary for a CDL Bus endorsement in Massachusetts. You must complete a state-approved driver education program that includes classroom instruction and behind-the-wheel training. The program will cover topics such as vehicle inspection, basic controls, and safe driving techniques. After the training, you must pass both knowledge and skills tests to obtain the endorsement.

In Massachusetts, CDL Bus licenses fall into three classes: Class A, B, and C. Class A licenses are for vehicles with a combined weight rating of 26,001 pounds or more. Class B licenses are for vehicles weighing 26,001 pounds or more, or a vehicle transporting 16 or more passengers. Class C licenses are for vehicles designed to transport 16 to 23 passengers, including the driver.

No, you cannot use your personal vehicle for the CDL Bus driving test in Massachusetts. The vehicle you use for the test must be of the same type and class that your CDL will cover. Therefore, you must take the test in a commercial bus. Many training schools provide vehicles for testing purposes.

The CDL Bus driving test in Massachusetts evaluates several skills. These include pre-trip vehicle inspection to ensure your bus is safe to drive, basic control skills like backing, parking, and turning, and on-road driving to assess your ability to handle a bus in different traffic situations. It also checks your ability to load and unload passengers, react to emergencies, and operate special features of the bus.

Yes, for a CDL Bus endorsement in Massachusetts, you must pass a Department of Transportation (DOT) physical examination. This examination ensures that you're physically capable of safely operating a commercial vehicle. It includes vision and hearing tests, blood pressure check, and an assessment of your overall physical condition. Any severe health issues that could interfere with driving safety may disqualify you.

No, it is not permissible to transport passengers without a valid CDL Bus endorsement in Massachusetts. Operating a commercial vehicle designed to carry 16 or more passengers, including the driver, requires a CDL with a Passenger (P) endorsement. Driving without the appropriate license or endorsement can result in hefty fines, penalties, and potentially the suspension of your driving privileges.

In Massachusetts, you can add the CDL Bus endorsement to your existing license. You don't need to apply for a new license. However, you must pass the Passenger Vehicles knowledge test and the skills test in a passenger vehicle of the same class that the applicant operates or expects to operate.

Yes, there are restrictions for drivers with a CDL Bus endorsement in Massachusetts. Drivers must not have any serious traffic violations within the past two years. They must pass a physical exam every two years, and they are subject to random drug and alcohol testing. Additionally, drivers must comply with hours-of-service regulations to prevent fatigue-related accidents.