Combination #2
Combination Vehicles Practice Test | Tennessee 2025 #2 Page 3 of 3
Train for FREE online with our Tennessee 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 TN 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.
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15 . If the emergency air line loses pressure:
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.
16 . Rearward amplification refers to:
Vehicles with trailers are vulnerable to rollover due to the "crack-the-whip" effect, which is caused by rearward amplification.
17 . When a vehicle goes around a corner, the rear wheels:
When any vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called off-tracking. The degree of off-tracking will be greater on long vehicles than on short vehicles.
18 . A loss of air pressure in the emergency line will cause:
The suspension springs to extend.
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.
19 . If you use the trailer hand brake while your trailer is skidding, it will:
If you are experiencing a trailer jackknife, you can help your tires regain traction by releasing the brakes. Using a trailer hand brake while experiencing a skid will only cause the skid to continue.
20 . A tractor protection valve is:
A device that allows the battery to recharge efficiently.
On combination vehicles with air brakes, the tractor protection valve keeps air in the tractor or truck brake system, should the trailer develop a bad leak or break away from the tractor.
See the exact questions that will be on the 2025 Tennessee DMV exam.
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2025 Tennessee | Frequently Asked Questions
A CDL Class B license in Tennessee allows the holder to operate single vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or any such vehicle towing another not exceeding 10,000 pounds. This includes buses, farm labor vehicles, and any vehicle designed to transport 16 to 23 passengers, including the driver.
With a Class B CDL license in Tennessee, you can operate single vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or tow a vehicle not heavy than 10,000 pounds. It includes straight trucks, large passenger buses, segmented buses, box trucks, dump trucks with small trailers, and trucks with small trailers.
To acquire a Class B CDL license in Tennessee, you must be at least 21 years old (or 18 for in-state transport only), possess a valid Tennessee driver's license, pass a vision test, and complete a Commercial Driver License Application. You also need to pass a written knowledge test and a skills test which includes pre-trip vehicle inspection, basic controls, and on-road driving.
In Tennessee, you must be at least 21 years old to qualify for a Class B CDL license for interstate commerce. However, if you plan to drive only within the state (intrastate commerce), you can obtain a Class B CDL license at the age of 18.
While specific endorsements are not necessary to obtain a basic Class B CDL license, they can enhance your licensure. Endorsements certify you to drive certain types of vehicles or transport specific cargo. For instance, a passenger or school bus endorsement allows you to drive such vehicles, while a hazardous materials endorsement permits you to transport hazardous cargo.
The Class B CDL skills assessment in Tennessee includes three parts: a pre-trip vehicle inspection to verify that you can assess if your vehicle is safe to drive, a basic vehicle controls test to check your ability to control the vehicle, and an on-road driving test to examine your practical driving skills in various traffic situations and conditions.
Yes, Class B CDL license holders in Tennessee are limited to operating single vehicles with a GVWR of 26,001 or more pounds, or a towed vehicle not exceeding 10,000 pounds GVWR. They are not authorized to drive a Class A vehicle unless they upgrade their license. Endorsements may be required for certain types of vehicles like school buses or tank vehicles.
In Tennessee, the written Class B CDL test is generally administered in English. However, the state may offer the test in other languages. It's recommended to contact the Tennessee Department of Safety & Homeland Security for specific information on language availability for the written test.
Yes, in Tennessee, you can request accommodations for the Class B CDL written exam if you have a disability. The Department of Safety and Homeland Security works to ensure all testing materials and methods are accessible. You should contact your local Driver Services Center in advance to discuss your needs and arrange appropriate accommodations.
If you fail the Class B CDL written test in Tennessee, you can retake it. However, you must wait at least one day before attempting the test again. There is no limit to the number of times you can retake the test, but a fee applies each time. It's recommended to study thoroughly before retesting.
