- Updated for January 2025
- Based on 2025 NC commercial driver's license manual
Free North Carolina CDL Combination Practice Test 2025
Thanks for stopping by to take our free North Carolina Combination practice test! This practice test will help you prepare to pass the official CDL Combination Vehicles knowledge test in {state--name}, which is a requirement to drive combination vehicles like semi-trucks and tractor-trailers. Have you been reading the official North Carolina Commercial Driver License Manual (North Carolina CDL Handbook 2025), especially Chapter 6 on combination vehicles? By taking this practice test, you’ll absorb the relevant information from this study guide more easily, which will increase your chances of passing the official knowledge test. The practice test is based on the official CDL manual, just like the official knowledge test. It’s up to date as of January 2025 and has 25 multiple-choice questions. The questions and answers on this practice test will assess your understanding of such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and pre-trip inspections. Unlike the official knowledge test, this practice test comes with an automated assistant, which can help you with a question by providing a hint and an explanation of the correct answer.
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 whose gross combination weight rating (GCWR) is at least 26,001 pounds and the gross vehicle weight rating (GVWR) of the towed units is over 10,000 pounds. If your career goal is to drive semi-trucks or tractor-trailers for a living, then this is the class of CDL you ought to obtain.
Once you obtain the class of CDL you want and all the endorsements you need, you’ll find many profitable opportunities in driving combination trucks. In North Carolina, key economic sectors include agriculture (such as tobacco, sweet potatoes, hogs, and soybeans) and manufacturing (such as furniture, pharmaceuticals, and textiles). Both of these sectors depend on trucks to transport their products. Drivers who operate refrigerated trucks (“reefers”) are in high demand to transport perishable products. The high-tech Research Triangle area also depends on truck drivers to deliver equipment and supplies to them. In addition, ports in Wilmington and Morehead City create opportunities for truck drivers to transport goods from the ports to major cities. Note: Seaports contain secure areas. You may need a Transportation Worker Identification Credential (TWIC) card to pick up cargo at these ports.
Major trucking routes include Interstates 40, 77, 85, and 95; and U.S. Routes 64, 70, and 74. Unfortunately, these Interstate highways are often heavily congested during peak hours. Also, sections of I-40 and U.S. 64 through the Appalachian Mountains include steep grades, tight curves, and the risk of landslides.
- 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 NC 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 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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