How many questions are on the CDL general knowledge test?

The CDL general knowledge test has 50 multiple choice questions in most states, and you need to score at least 80 percent, which is 40 out of 50 correct, to pass. Every driver applying for a commercial driver license takes this test, and it covers safe vehicle operation, control, inspection, and the rules that apply to all commercial vehicles. Exact counts and rules are set by your state driver licensing agency, so confirm the numbers in your state CDL manual before you test.

What is a passing score on the CDL test?

You need at least 80 percent correct to pass each CDL knowledge test in every state. On the 50 question general knowledge test that means 40 correct answers, on the 25 question air brakes test it means 20 correct, and on the combination vehicles test it means 80 percent of that test's questions. Because the bar is the same 80 percent across the board, a few wrong answers can be the difference between passing and retaking, so practice until you clear 80 percent comfortably on fresh questions.

How many questions are on the CDL air brakes test?

The air brakes knowledge test has 25 questions in most states, and you need 20 correct, or 80 percent, to pass and remove the air brake restriction from your license. A few states use 20 questions instead of 25, but the 80 percent passing standard stays the same. The test covers air brake system parts, how the system works, inspection, and safe use. You take it if the vehicle you will drive is equipped with air brakes.

What CDL knowledge tests do I need to take?

Every CDL applicant takes the general knowledge test. Beyond that, the tests you need depend on the class of license and the vehicle you will drive. If your vehicle has air brakes, you take the air brakes test. For a Class A license to pull trailers, you take the combination vehicles test. Endorsements such as tanker, hazardous materials, passenger, school bus and doubles or triples each add their own knowledge test. Check your state CDL manual to confirm exactly which tests and endorsements apply to your goal.

Is the CDL test hard?

The CDL knowledge tests are passable with focused study, but they are not a formality. The general knowledge, air brakes and combination vehicle tests each demand a firm grasp of specific system parts, inspection steps and safety rules, and the 80 percent passing bar leaves little room for guessing. The air brakes and inspection details trip up the most people. Repeated practice on questions drawn from your own state CDL manual, especially the parts you keep missing, is what moves a shaky score to a comfortable pass.

Can I use my state CDL manual to study?

Yes, and you should. Every knowledge test question is drawn from the material in your state CDL manual, so it is the single most important study source. Upload the manual or the specific sections you are working on, such as air brakes or combination vehicles, and the tool turns that exact text into practice questions with an answer key. Studying from your own state's manual matters because rules, weights and a few procedures vary by state, and you are tested on your state's version.

Is this an official CDL practice test?

No. PDFQuiz is an independent study tool and is not affiliated with or endorsed by any state driver licensing agency, the Department of Motor Vehicles or the Federal Motor Carrier Safety Administration. This tool generates practice questions from the CDL manual and notes you upload so you can rehearse recall between study sessions, and it does not reproduce official exam questions. Use it alongside your state CDL manual and an approved entry level driver training program, not as a replacement for them.

CDL practice test

CDL Practice Test and Permit Practice Questions From Your Own CDL Manual and Notes

Upload your state CDL manual, the air brakes or combination vehicles section, or your own study notes and the AI writes unlimited practice questions with an answer key and explanations in seconds. Drill the exact rules and system parts in the material your state actually tests instead of guessing from a generic question bank.

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In short: to build CDL practice questions, upload your state CDL manual, a single section like air brakes, or your own notes, and the AI writes multiple choice questions with an answer key and explanations in seconds. The general knowledge test has 50 questions and needs 80 percent to pass, the air brakes test has about 25 questions at the same 80 percent bar, and the combination vehicles test runs 20 to 30 questions. Generate focused sets from your own state's manual so you drill the exact rules you will be tested on, right up to the day at the DMV.

Last updated July 2026

General knowledge test: 50 questions
Passing score: 80% on each test
Practice questions: Unlimited

What a CDL practice question generator does

Drill your own state CDL manual, not a generic bank

The CDL knowledge tests pull straight from your state CDL manual, and a generic online question bank often does not match the weights, rules and procedures your state actually uses. This tool flips the source. You upload what you are actually studying, the manual itself, the air brakes or combination vehicles section, or your own notes, and the AI question generator from PDF writes brand new items from that exact text. Weak answers point straight back at the system part or rule you need to review, and a fresh practice set is always one upload away.

Works with your state CDL manual

Upload the full manual PDF, a single section, a topic outline or handwritten notes you photographed. If the file explains a CDL topic, the generator can build questions on it from your state's version.

General knowledge and endorsement drills

Need to shore up air brakes or combination vehicles on their own? Upload each section separately and narrow your practice to one test, or to an endorsement like tanker or hazmat, when your scores there are soft.

Fresh questions every session

Generate a new set every time so you are testing knowledge, not recognition. Repeated retrieval on unseen items is what pushes a borderline score above the 80 percent bar every state requires.

CDL knowledge tests and how to practice each one

Which tests you take depends on your license class, vehicle and endorsements. Question counts vary slightly by state, and the passing bar is 80 percent on every one. Confirm your exact requirements in your state CDL manual.

Knowledge test	Typical questions	What it covers
General Knowledge	50 (pass 40)	Vehicle control, safe operation, inspection and the rules for all commercial vehicles
Air Brakes	~25 (pass 20)	Air brake system parts, how it works, inspection and safe use to remove the air brake restriction
Combination Vehicles	20 to 30	Coupling and uncoupling, trailer safety and driving combination units for a Class A license
Hazardous Materials (H)	~30	Hazmat rules, placarding, loading and security for the hazmat endorsement
Tanker (N)	~20	Liquid surge, handling and inspection for hauling tank vehicles
Passenger (P) and School Bus (S)	~20 each	Passenger safety, loading and unloading, and school bus specific procedures
Doubles and Triples (T)	~20	Coupling multiple trailers and handling doubles and triples safely

Everyone takes the general knowledge test, then adds the tests that match the vehicle and endorsements they want. Air brakes and combination vehicles are the two most people study alongside general knowledge for a Class A license. Build practice sets from each section of your state CDL manual separately, give the air brakes and inspection material extra reps since those are common weak spots, then mix everything so the full test feels routine.

Simple process

How to make CDL practice questions in 4 steps

1 Upload your material: Drop in your state CDL manual, a single section like air brakes, a topic outline or your own notes. Scanned and handwritten pages are read with OCR.
2 Set the drill: Pick the question count and difficulty. Run a 20 question warm-up on air brakes or a longer mixed set across the whole general knowledge section.
3 AI writes questions: The AI reads your content and writes CDL style multiple choice questions with an answer key and explanations.
4 Review and repeat: Score the set, review the rule or system part behind every miss, then generate a fresh drill on just those weak topics and go again.

Who uses this to prep for the CDL

New drivers going for their permit

You are working through the CDL manual for your commercial learner permit and want to be sure it stuck. Upload one section at a time and generate a quick set that checks your recall, then hit the same section tomorrow with different questions so your score climbs above 80 percent.

Career changers entering trucking

If you are studying for a CDL while working another job, air brakes and inspection take the most warming up. Turn your manual into questions you have never seen and drill in short sessions, without paying for a separate question bank just for fresh items.

Drivers adding an endorsement

When you need a tanker, hazmat or doubles and triples endorsement, you only have to master that section. Upload just those manual pages, drill until the misses stop, and walk into the endorsement test scoring well above the cutoff.

CDL practice questions, answered

How many questions are on the CDL general knowledge test?: The CDL general knowledge test has 50 multiple choice questions in most states, and you need to score at least 80 percent, which is 40 out of 50 correct, to pass. Every driver applying for a commercial driver license takes this test, and it covers safe vehicle operation, control, inspection, and the rules that apply to all commercial vehicles. Exact counts and rules are set by your state driver licensing agency, so confirm the numbers in your state CDL manual before you test. If your manual is on paper, run it through an OCR tool like DocuOCR first so the text is selectable.
What is a passing score on the CDL test?: You need at least 80 percent correct to pass each CDL knowledge test in every state. On the 50 question general knowledge test that means 40 correct answers, on the 25 question air brakes test it means 20 correct, and on the combination vehicles test it means 80 percent of that test's questions. Because the bar is the same 80 percent across the board, a few wrong answers can be the difference between passing and retaking, so practice until you clear 80 percent comfortably on fresh questions.
How many questions are on the CDL air brakes test?: The air brakes knowledge test has 25 questions in most states, and you need 20 correct, or 80 percent, to pass and remove the air brake restriction from your license. A few states use 20 questions instead of 25, but the 80 percent passing standard stays the same. The test covers air brake system parts, how the system works, inspection, and safe use. You take it if the vehicle you will drive is equipped with air brakes.
What CDL knowledge tests do I need to take?: Every CDL applicant takes the general knowledge test. Beyond that, the tests you need depend on the class of license and the vehicle you will drive. If your vehicle has air brakes, you take the air brakes test. For a Class A license to pull trailers, you take the combination vehicles test. Endorsements such as tanker, hazardous materials, passenger, school bus and doubles or triples each add their own knowledge test. Check your state CDL manual to confirm exactly which tests and endorsements apply to your goal.
Is the CDL test hard?: The CDL knowledge tests are passable with focused study, but they are not a formality. The general knowledge, air brakes and combination vehicle tests each demand a firm grasp of specific system parts, inspection steps and safety rules, and the 80 percent passing bar leaves little room for guessing. The air brakes and inspection details trip up the most people. Repeated practice on questions drawn from your own state CDL manual, especially the parts you keep missing, is what moves a shaky score to a comfortable pass.
Can I use my state CDL manual to study?: Yes, and you should. Every knowledge test question is drawn from the material in your state CDL manual, so it is the single most important study source. Upload the manual or the specific sections you are working on, such as air brakes or combination vehicles, and the tool turns that exact text into practice questions with an answer key. Studying from your own state's manual matters because rules, weights and a few procedures vary by state, and you are tested on your state's version.
Is this an official CDL practice test?: No. PDFQuiz is an independent study tool and is not affiliated with or endorsed by any state driver licensing agency, the Department of Motor Vehicles or the Federal Motor Carrier Safety Administration. This tool generates practice questions from the CDL manual and notes you upload so you can rehearse recall between study sessions, and it does not reproduce official exam questions. Use it alongside your state CDL manual and an approved entry level driver training program, not as a replacement for them.

Related study tools

Studying for another licensing exam too? You can build a real estate practice exam or an Enrolled Agent practice exam from your own notes the same way. To turn any source into a set, use the PDF to practice test generator or the study notes to quiz maker.

Build your first CDL practice set now

Upload your state CDL manual or notes and generate practice questions in under a minute. Keep generating fresh sets on your weak sections until every timed run clears the 80 percent your state requires.

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