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Class B Commercial Drivers License Practice Test

Pass the CDL Class B Test on your very first try! Take our FREE Practice Test for the ultimate test preparation. Our practice tests have 25 multiple choice questions straight from the handbook and give immediate feedback.

Questions number
Mistakes Allowed
Passing Score

Class B Permit Practice Test 1

To operate certain commercial motor vehicles (CMVs) in the United States, a driver must possess a valid commercial driver's license (CDL). The CDLs may vary in scope giving rise to different classes. One such class is the Class B CDL.

Obtaining and holding a Class B license lets you operate a single vehicle with a gross vehicle weight rating of 26,000 pounds or more or any such vehicle towing another vehicle with a gross vehicle weight rating not exceeding 10,000 pounds.

Some examples of these vehicles include:

  • Straight trucks
  • Large passenger buses like tourist buses, city buses, and school buses
  • Segmented buses
  • Box trucks like delivery trucks and furniture trucks
  • Dump trucks with small trailers
  • Tractor-trailers

If driving any of these vehicles has ever crossed your mind, you should be getting ready to apply for and obtain your Class B license. The market for Class B vehicles is somewhat competitive, and starting early can give you an upper hand.

You will be required to take a series of tests and training to obtain this license, and it all starts with a written general knowledge test. This test examines your knowledge of trucking laws, traffic signs, signals, speed limits, and elementary commercial vehicle safety to develop a safer driver in you.

You will hardly pass the test without proper preparation. To ensure you pass on your very first try, we have put together a free Knowledge Practice Test containing authentic material based on the CDL handbook. Our tests are good for providing insight into the areas of knowledge which will appear on the actual test.

Where do I start?

As you begin your career on the road, you should start from a place of understanding. Knowing what you are getting yourself into is what shapes your success story.

So, before jumping into the DMV test for your Class B CDL, take some time practicing with our free practice tests. Our Practice tests will paint an accurate picture of what the DMV expects from you and ensure you can pass with confidence.

What you need to know before you start

Operating a commercial vehicle demands a lot more skill from you than driving a regular car, van, or truck. That's why obtaining a Class B license is mandatory for such drivers.

Depending on how fast you want to scale your driving career, you should always seek additional endorsements to open yourself up to more load-carrying options and more vehicle types. As you do that, avoid CDL restrictions as much as possible.

You can achieve this at the test level by completing and passing your air brakes knowledge test, pre-trip inspection test, as well as the skills test. Failing the air brakes test earns you a CDL restriction that prohibits you from operating a vehicle with full air brakes.

What's on Class B Knowledge Test

On the final examination day at the DMV, you can expect a test comprising 50 multiple-choice questions. You must answer at least 40 of these questions correctly to obtain the 80% passing score.

Who Should Take this Practice Test

The test is ideal for first-time Class B CDL applicants, existing Class B CDL holders seeking additional endorsements, as well as Class B CDL renewal applicants.

Requirements to Take the Class B Knowledge Test

The test requires you to:

  • Be at least 21 years
  • Pass the eye exam
  • Provide some identification proof
  • Show evidence of lawful presence in the US
  • Pay the applicable fees

CDL Sample Test Questions

As you are checking your hydraulic brakes, you should pump the brake pedal three times and then hold it for how many seconds?
  • 30 seconds.
  • 5 seconds.
  • 10 seconds.
  • 15 seconds.
  • 23 seconds.
For your pre-trip vehicle inspection test, your entry doors should be in what condition?
  • All of the listed answers.
  • Your entry doors should be undamaged.
  • Entry doors should operate smoothly from the outside.
  • Entry doors should be in working condition.
How do air-operated disc brakes work?
  • Air pressure acts on the brake chamber and slack adjuster. The pressure of the brake chamber on the slack adjuster turns the power screw.
  • The heating of the brake chamber moves the power screw.
  • Water reaches its boiling point and the evaporated air powers the s-cam.
  • None of the listed answers.
If the malfunction lamp stays on after the bulb check, __________.
  • The brakes have overheated.
  • You may have lost ABS control at one or more wheels.
  • The low air pressure warning signal is not working.
  • None of the listed answers.
On your vehicle inspection test, what should you do to check that your tire is inflated properly?
  • Use a tire gauge.
  • Kick the tire.
  • You should not check how inflated the tires are.
  • Give it a good feel.


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