- Updated for January 2025
- Based on 2025 MO commercial driver's license manual
Free Missouri CDL Combination Practice Test 2025
Drivers of combination trucks in the great state of Missouri can find profitable economic opportunities in several key economic sectors. Agriculture employs about 15% of the state’s workforce, producing beef, pork, soybeans, rice, and other agricultural products. There is also a thriving wine industry. Another significant economic sector is manufacturing, including aerospace, chemicals, trucks and vans, and food products. The high-tech sector, including biotechnology and information technology, is also growing. All these sectors depend on truckers to transport their products. In addition, some of these sectors – high-tech in particular – depend on truckers to deliver materials and equipment to them.
One of the busiest trucking routes in Missouri is Interstate 70, which runs from Utah to Maryland and connects St. Louis to Kansas City. Other major Interstate trucking routes include Interstate 35, which runs from Texas to Minnesota and connects Kansas City to Des Moines, Iowa; Interstate 44, which begins at Wichita Falls, Texas and connects Springfield to St. Louis, where it terminates; and Interstate 55, which runs from the Gulf of Mexico to the Great Lakes and connects St. Louis with Memphis, Tennessee.
Want to drive combination vehicles on these roads for a living? By now, you’ve probably been working hard to obtain a Commercial Driver’s License (CDL), which will allow you to drive commercial motor vehicles (CMVs). That’s a huge step – but not the only step. To drive combination vehicles specifically, you must also pass the official Combination Vehicles knowledge test. It’s based on the official Missouri Commercial Driver License Manual (Missouri CDL Handbook 2025), which you’ve probably read. But if you could use more help to pass the knowledge test beyond what you’re getting from this study guide, we’ve got just the thing.
This free Missouri CDL Combination practice test is based on the official state CDL manual, just like the official Combination Vehicles knowledge test. It’s up to date as of January, 2025. It has 25 multiple-choice questions and answers on such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and vehicle inspections. Unlike the official knowledge test, each question on this practice test comes with an available hint and an explanation of the correct answer. What this practice test doesn’t come with is a time limit. Take your time, not only to improve your chances of passing the test but also to learn as much as you can from the experience. For example, if you miss a question, you may want to pause the test and look up the information in the CDL manual before you proceed further.
- 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 MO DOR 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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