- Updated for January 2025
- Based on 2025 AL commercial driver's license manual
Free Alabama CDL Combination Practice Test 2025
In the United States, there are three main classes of Commercial Driver’s Licenses (CDLs): Class A, Class B, and Class C. A Class A CDL allows you to operate a combination vehicle with a gross combination weight rating (GCWR) of 26,001 pounds or more, provided the towed vehicle(s) has a gross vehicle weight rating (GVWR) of more than 10,000 pounds. This class of CDL is typically for operating semi-trucks and tractor-trailers.
No matter which class of CDL you plan to get, you must meet a series of requirements. For one, you must pass an official skills test in a vehicle that is representative of the CDL class you’re applying for. The skills test includes basic vehicle maneuvers, a pre-trip inspection, and a road test. To be sure of passing the skills test, you must practice commercial driving under supervision until you’re proficient. And to be allowed to practice commercial driving, you must hold a Commercial Learner’s Permit (CLP).
To obtain a CLP, you must also meet certain requirements, including passing the official General Knowledge test on the basic theory of commercial driving. The questions on this test are based on the official Alabama Commercial Driver License Manual (Alabama CDL Handbook 2025).
To practice operating combination vehicles (as well as operate them for a living), you must also pass the official Combination Vehicles knowledge test to show that you understand the basic theory of operating combination vehicles. The Combination Vehicles knowledge test is also based on that same study guide. Hence, you should read the manual several times to learn as much as you can from it. But if you’ve found it tough to learn enough from the manual, you probably need some more help.
This free Alabama CDL Combination practice test is based on the official CDL manual, just like the official Combination Vehicles knowledge test. It’s up to date as of January, 2025. There are 25 multiple-choice questions and answers on such topics as combination braking systems, combination driving techniques, coupling, and pre-trip inspections. Our automated assistant can give you a hint if you get stuck or an explanation of the correct answer if you still miss the question. There’s no time limit; take all the time you need to learn and master the material covered by this practice test. Take the practice test as an open-book test if you wish. If you get stuck on a question, try to look up the correct answer in the CDL manual. You’ll learn more that way than by random guessing.
Be sure to try our other CDL Combination Vehicles practice tests too.
- Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
- Triple-checked for accuracy
What you need to know
What to expect on the actual AL DMV exam
questions
correct answers to pass
passing score
Helpful links
List of questions (classic view)
- After you lock the kingpin into the fifth wheel, how should you check the connection?
- After you connect the air lines but before you back under the trailer, you should
- Which statement best illustrates the "crack-the-whip" effect?
- When you inspect the landing gear after uncoupling the trailer, where should the tractor be?
- What is the safest way to turn right from a two-way road?
- To drive a triple combination vehicle, you must have
- To prevent rollover, cargo should be
- Combination vehicles take longer to stop when they are empty than when they are fully loaded, because
- If your vehicle gets stuck on a railroad track, you should
- Low-slung vehicles can be risky at railroad crossings because
- On a double or triple vehicle, which wheels offtrack the most?
- When you're pulling doubles or triples, the shut-off valves should always be
- On a trailer, where is the yellow antilock brake (ABS) malfunction lamp located?
- Even before antilock braking systems (ABS) were required, some vehicles already had them. How can you check if your vehicle has ABS?
- An antilock braking system (ABS) is useful
- After coupling, make sure that the air lines are not crossed. How should you do this?
- During uncoupling, you should disconnect the electrical cable and
- Before you start to uncouple, you must
- You can confirm that air is going to all brakes in your trailers by
- To uncouple a loaded trailer, after the landing gear has made firm contact with the ground, you should
- If the trailer has antilock brakes (ABS) but the tractor doesn't,
- To test the tractor protection valve, charge the trailer air brake system, turn off the engine, and
- If your test of the tractor protection valve is successful,
- The tractor protection valve is designed to close automatically when the air pressure falls into the pressure range specified by the manufacturer, typically
- As part of your vehicle inspection test, if your vehicle is equipped with air brakes and has a trailer, you will inspect the air connections between the truck or tractor and the trailer. Make sure that the ________ are locked in place and free of damage or air leaks.
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