Knowledge Test Class B #1
Class B Driving Test | Tennessee 2026 #1 Page 5 of 7
Train for FREE online with our Tennessee class B license 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 CDL class B permit in 2026, 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 CDL class B requirements may vary from state to state.
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29 . Foundation brakes are used:
At each wheel.
Foundation brakes are used at each wheel. The most common type is the S-cam drum brake.
30 . Emergency brakes:
All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.
31 . If the safety relief valve in the air brake system releases air:
An air brake system has a safety relief valve, which releases air from the tanks if the pressure gets too high. If the valve must operate, something in the system is wrong and should be addressed by a mechanic.
32 . Being convicted of driving under the influence and losing your license while driving your personal vehicle:
If you lose the right to drive your personal vehicle due to an alcohol-related violation, this will result in the loss of your CDL for one year.
33 . Fuel records supporting IFTA quarterly fuel use tax returns must be kept by carriers for:
Four years.
In general, if you operate a commercial vehicle in interstate commerce, it must be registered under the International Registration Plan (IRP) and International Fuel Tax Agreement (IFTA). These programs collect and distribute vehicle registration fees and fuel taxes based on what jurisdictions you drive in and for how long. Mileage and fuel records supporting IFTA quarterly fuel tax returns must be retained by carriers for four years.
34 . If brakes overheat while going down a downhill grade, they may:
Overuse of the brakes may cause them to overheat, making them less effective. This is known as "fade."
35 . When driving, how can you maintain alertness?
Strategies to avoid becoming fatigued while driving include keeping the cab cool inside by using the air conditioner or opening a window; avoiding heavy foods; and taking rest breaks about every two hours or 100 miles.
See the exact questions that will be on the 2026 Tennessee DMV exam.
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Lillian MCcranie explains how our CDL study guide was helpful in passing the exam and recommends it to everyone.
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2026 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.
