- Updated for January 2025
- Based on 2025 KY commercial driver's license manual
Free Kentucky CDL Combination Practice Test 2025
There are three classes of Commercial Driver’s Licenses (CDLs): Class A, Class B, and Class C. A Class A CDL allows you to operate combination vehicles 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. To drive semi-trucks (including flatbeds) or tractor-trailers, this is the class of CDL you should obtain.
To obtain a CDL of any class, you must pass a medical examination, a General Knowledge test on the general theory of commercial driving, and a skills test to show that you can operate commercial motor vehicles of that class safely.
You’ll likely have to pass some other official knowledge tests as well, depending on the class of CDL you’re applying for and the types of vehicles you plan to drive in your career. To drive combination vehicles, you’ll have to pass the Combination Vehicles knowledge test.
The questions on both the General Knowledge test and the Combination Vehicles knowledge test are based on the official Kentucky Commercial Driver License Manual (Kentucky CDL Handbook 2025). However, if you’ve had trouble absorbing the information presented in this study guide, we can help.
This free Kentucky CDL Combination practice test you’re about to take 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 practice questions and answers on such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and pre-trip inspections. If you get stuck on a question, use the available hint. If you still miss a question, read the explanation of the correct answer carefully so you’ll know what to answer the next time. You can also ask our automated assistant for even more help. With us, there’s no time limit; take all the time you need to learn and master the material covered by this practice test. You can even use the practice test as an open-book exam: Keep the official CDL manual open while you take the practice test. You’ll learn more by looking up the correct answer to a puzzling question than by just guessing the answer.
And once you get a CDL of the appropriate class and any endorsements you need, profitable opportunities may await you in several of Kentucky’s economic sectors, such as agriculture (including poultry, corn, soybeans, apples, beef cattle, and tobacco), manufacturing (especially cars and trucks), and logistics (especially UPS Worldport).
- 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 KY KSP 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 a 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 if 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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