Free Ohio CDL Combination Practice Test 2025

Part of mandatory Entry-Level Driver Training Course Based on 2025 OH commercial driver's license manualAvailable in EN, ES

25questions

5mistakes allowed

80%passing score

Have you been reading the official Ohio Commercial Driver License Manual (Ohio CDL Handbook 2025) to try to pass the official Combination Vehicles knowledge test on operating combination vehicles? Still concerned that you may not pass the test without additional help of some kind? No problem! That’s what we do. Many other aspiring commercial drivers have found themselves in the same situation. That’s why many of them have come here to supplement their reading of the manual with the study tools we offer.

This free Ohio CDL Combination practice test is based on the official manual, just like the official Combination Vehicles knowledge test. The practice test is up to date as of January 2025. Practicing with it will make all the material covered by the test questions easier to remember. To make your learning easier, each of the 25 practice questions comes with a helpful hint and an explanation of the correct answer. The practice questions and answers on this test will assess your knowledge of such topics as combination braking systems, combination driving techniques, coupling and uncoupling, and pre-trip inspections. Stuck on a puzzling question? Our automated assistant can give you a hint. Still answered the question wrong? The assistant can give you an explanation of the correct answer.

There are three classes of Commercial Driver’s License (CDL): Class A, Class B, and Class C. Class A is typically for operating heavy combination vehicles such as semi-trucks and tractor-trailers in Ohio. Passing the Combination Vehicles knowledge test is a virtual necessity for Class A. Otherwise, you won’t even be able to practice driving heavy combination vehicles, which will largely defeat the purpose of obtaining a Class A CDL.

Once you hold a CDL of the appropriate class and all the endorsements you need, you can profit from all the commercial driving opportunities Ohio has to offer. Ohio is the third-largest manufacturing state in the country (behind California and Texas), with over 12,000 manufacturers producing a wide variety of products. Truck drivers are in demand to deliver raw materials to them as well as transport their products. Ohio also employs truck drivers to transport products from its large agricultural sector.

Ohio is also a major Midwest logistics hub. It’s served by such important Interstate truck routes as Interstates 70, 71, 75, 77, and 80/90. Other important truck routes include U.S. Routes 23, 33, and 35 and Ohio Routes 4 and 32. However, winter driving can be difficult, particularly near Lake Erie. Snowstorms, ice, and freezing rain can make driving hazardous on I-90 and I-77 because of lake-effect snow.

4.48 out of 5 • 27 votes.

Perfect for

First-time OH CDL and CLP applicants
CDL holders adding endorsements
OH CDL renewal applicants

Unlock all questions with Premium

What to expect on the actual exam

How many questions	20
How many correct answers to pass	16
Passing score	80%

Unlock all 1,500+ exam-like questions for Ohio. Pass Guarantee

Become a member to unlock our extensive library of 1,500+ exam-like questions and get your Ohio ELDT certification online. Official FMCSA-approved national Entry-Level Driver Training provider.

Pass the first time, guaranteed Driving-Tests program displayed on a laptop

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.