How many questions are on the CDL permit test? The CDL general knowledge test has 50 questions, and you need at least 40 correct answers to pass. That 80% threshold is the federal minimum set by the FMCSA under 49 CFR Part 383, and it applies to every separate knowledge test you take, not just the general one. What surprises most first-time CLP applicants is that the CDL permit test is not one exam: it is a series of individual tests, each with its own question count, passing score, and sometimes a time limit. If you walk into the DMV without knowing what to expect from each section, you are already behind.
This article breaks down every section of the CDL permit testing process, the exact question counts, the passing thresholds, and the key differences between states. State-level differences are noted throughout so you can calibrate your prep to where you are actually testing. By the time you finish reading, you will know precisely what you are preparing for and how to practice in a way that mirrors the real exam.
Key takeaways
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General knowledge test: 50 questions in most states, with 40 correct (80%) required to pass, based on the FMCSA federal minimum of 30 questions and an 80% threshold (49 CFR Part 383).
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Multiple separate exams: Air brakes, combination vehicles, and each endorsement are independent tests with their own question counts and passing scores.
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80% rule is per test: You pass or fail each exam on its own merits; strong performance on one test cannot compensate for a weak score on another.
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Time limits vary: Many states do not publish a formal time limit; where one is reported, it is commonly 50 to 60 minutes for the general knowledge test.
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State-level differences exist: Texas does not publish fixed question counts; always confirm details with your state's official CDL manual or DMV testing page.
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Practice format matters: Replicating the real test format, including question count and time pressure, is the most effective preparation strategy.
What is the CDL permit test actually testing?
The commercial learner permit (CLP) process requires you to pass at least one knowledge test before you ever touch a truck during a skills test. The term "CDL permit test" is misleading, though. There is no single, all-in-one written exam. The FMCSA requires states to administer separate knowledge tests for general knowledge, air brakes, combination vehicles, and each endorsement you pursue. Every test stands on its own, and you must pass each one independently.
Federal regulations establish a floor: the general knowledge test must contain a minimum of 30 questions under 49 CFR Part 383, and the passing score on any CDL knowledge test must be at least 80%. States can and do raise those minimums, which is why most use 50 questions for the general test rather than the federal minimum of 30. Understanding this federal baseline helps you interpret whatever your state's DMV publishes, or does not publish. The specifics you need are always in your state's official CDL manual and the DMV's testing page, not in a third-party summary.
How many questions are on the CDL permit test: general knowledge section?
The CDL general knowledge test in most states has 50 multiple-choice questions. To pass, you need at least 40 correct answers, which is the 80% threshold. That means you can afford to miss up to 10 questions and still walk out with your CLP. The general knowledge test covers a wide range of topics: basic vehicle control, shifting and backing, pre-trip inspection fundamentals, cargo handling, hours of service basics, and driving in hazardous conditions.
This test is not your only written hurdle. Air brakes, combination vehicles, and every endorsement you want are separate exams with their own question banks. Passing the general knowledge test qualifies you for a base CLP; it does not automatically authorize you to drive a truck with air brakes or pull a combination rig. Many applicants are surprised when the testing officer hands them a second or third exam immediately after finishing the first one.
Is the air brakes knowledge test required, and how many questions does it have?
The air brakes knowledge test is required any time you want to remove the "L" restriction from your CLP and eventual CDL. That restriction prohibits you from operating commercial vehicles equipped with air brakes. Because the vast majority of Class A and most Class B vehicles use air brakes, skipping this test effectively limits where you can work. In most states, you take the air brakes test during the same DMV visit as your general knowledge test.
The air brakes test typically has 25 questions, and you need at least 20 correct answers to pass, maintaining the same 80% standard. The content focuses on how air brake systems work, inspection procedures, brake fade, proper braking techniques, and emergency situations. The question count is noticeably smaller than the general test, but the material is technical and specific, which catches candidates who try to skim the air brakes chapter instead of studying it thoroughly.
How many questions are on the CDL permit test: combination vehicles and endorsements?
The combination vehicles test is separate from the endorsement tests and is generally required for Class A applicants. It typically carries 20 questions, with 16 correct (80%) needed to pass. The content covers coupling and uncoupling procedures, tractor-trailer handling differences, rollover prevention, and air brake system specifics for combination rigs. If you are pursuing a Class A CDL, plan to take this test in addition to the general knowledge and air brakes tests.
Each endorsement is its own independent exam with its own question count. Here is how those counts typically break down across states (based on state CDL manuals and aggregated state testing data, including sources such as NY DMV; verify counts with your state's official CDL manual):
Knowledge test
Typical question count
Correct needed (80%)
General knowledge
50
40
Air brakes
25
20
Combination vehicles
20
16
Hazardous materials (H)
30
24
Passenger (P)
20
16
School bus (S)
20–25
16–20
Tank vehicles (N)
20
16
Doubles/triples (T)
20
16
A Class A driver pursuing general knowledge, air brakes, combination vehicles, hazmat, passenger, and school bus qualifications would sit for six separate exams totaling roughly 165 to 170 questions, depending on how that state administers the school bus test. New York's DMV lists the school bus endorsement at 20 questions with 16 correct required to pass. That is a substantial amount of material to cover, which is why endorsement-focused study sessions deserve dedicated prep time, not last-minute cramming.
What does the 80% passing score actually mean on the CDL permit test?
The 80% rule does not work like a grade point average across all your tests combined. If you score 95% on the general knowledge test and 75% on air brakes, you failed air brakes, full stop. You pass or fail each exam on its own merits, which means you cannot compensate for a weak section by acing another one. This is the single most misunderstood aspect of CDL testing, and it catches retakers who felt fine overall but failed one specific exam.
Knowing your "miss budget" per test helps reduce anxiety and sharpen your prep focus. On a 50-question general test, you have a margin of 10 questions. On a 25-question air brakes test, that margin shrinks to 5. On a 20-question endorsement exam, you can miss just 4. The smaller the test, the less room for error, which is why endorsement tests demand precise preparation even though they cover a narrower topic range than the general knowledge exam.
What happens if you fail one section? You typically keep credit for the sections you passed and retake only the failed one. Failing air brakes does not invalidate your general knowledge score. There is no federal limit on retake attempts: each state sets its own rules, waiting periods, and fees. Georgia allows up to three failures under a current application before requiring reapplication through the CDL unit, with waiting periods that increase from about two days after the first failure to seven days after later ones. Some sources cite a 30-day wait in Illinois after three failures and a 90-day wait after a subsequent three, confirm these details directly with the Illinois Secretary of State's office before scheduling. Always verify your state's specific retake rules before you schedule an appointment.
Does the CDL permit test have a time limit?
Time limits are the least standardized element of CDL testing. Many states do not post a formal time limit anywhere in their CDL manual or on their DMV website. Where states do report a limit, it is commonly 50 to 60 minutes for the general knowledge test. Third-party prep sites cite Utah at approximately 50 minutes and Georgia at approximately 60, neither figure appears in official state publications as of this writing, so treat them as rough benchmarks and verify with your state's testing office before your appointment.
The absence of a published limit does not mean you have unlimited time. Testing procedures vary by DMV office, so treat this as practical advice: prepare as if you are working under a 60-minute window, pace yourself at roughly one minute per question, and avoid dwelling on any single item for more than two minutes. Texas DPS does not publish a fixed time limit at all; applicants complete the computer-based exam at their own pace according to official DPS materials, but that is not a reason to go in unprepared for steady pacing.
Completing full timed practice tests during your prep builds the mental habit of deliberate pacing before you ever sit at a DMV terminal. That kind of rehearsal matters. Candidates who have only taken untimed practice quizzes often slow down when they realize a real exam environment feels different, and a 20-question endorsement test with a 4-question miss budget is not the place to find that out.
How do question counts and time limits differ by state?
The FMCSA sets the federal floor but leaves exam administration to each state. That means you will find very different levels of transparency depending on where you test. New Jersey's MVC publishes that the general knowledge test is 50 questions requiring 40 correct, with no stated time limit. New York's DMV goes further and lists specific endorsement question counts, including the school bus exam at 20 questions with 16 correct required. Texas, on the other hand, does not publish fixed question counts in its CDL materials, and time limits are not publicly stated; confirm those details with the Texas DPS testing office directly before your appointment.
State
GK questions
Passing score
Time limit
New Jersey
50
80% (40/50)
Not published (NJ MVC)
Georgia
~50
80% (40/50)
~60 min (verify with Georgia DDS)
Utah
~50
80% (40/50)
~50 min (verify with Utah DLD)
Texas
Not published
80% (each test)
Not published (Texas DPS)
For any state, the definitive source is your state's official CDL manual and the DMV or licensing agency's testing page. Where that information is absent, contact the testing office directly before your appointment. Washington State, as another example, covers one attempt at each knowledge test within a 90-day window under its fee structure, with passed scores remaining valid for 180 days. The rules differ significantly from state to state, and the only way to know your specific situation is to go to the source.
How to practice so the real CDL permit test feels familiar
The most effective way to prepare for a 50-question timed knowledge test is to practice 50-question timed knowledge tests. That seems obvious, but many candidates spend their prep time reading the CDL manual passively or taking short, untimed quizzes that do not replicate exam conditions. That is where prep tools come in. At CDLTest360, our exam simulation mode is built around exactly the format you will face: 50 questions, timed, with an 80% pass threshold built directly into the scoring. When the simulation marks you at 79%, it does not let you slide by, because the real DMV will not either. That kind of honest feedback before the test that counts is the difference between walking in confident and walking in hoping.
Beyond full simulations, targeted drilling on specific sections matters just as much. Our missed-question review system isolates every question you answered incorrectly and re-drills it until you get it right consistently. If air brakes is your weak section, you work air brakes. If combination vehicles logic is costing you points, the platform surfaces those questions again automatically. All content on CDLTest360 is sourced from FMCSA regulations and covers all 50 U.S. states, so whether you are testing in New Jersey, Texas, Georgia, or anywhere else, you are studying from the same federal baseline that built the exam. State-specific CDL manuals are also available inside the platform to address minor state-level variations.
For candidates who want to start immediately without committing to anything, our no-account-required free trial lets you jump into practice questions right now. Pricing for full access is $39.99 for a 90-day pass or $19.99 per month with no long-term commitment. The PTI phrase trainer drills the exact wording you must recall during the pre-trip inspection portion of the CDL test, a section where focused repetition pays off. Preparation that matches the real exam format, across every section you will face, is the shortest path from studying to passing.
The bottom line on CDL permit test question counts
If you have been asking how many questions are on the CDL permit test, here is the complete picture: it is not one exam but a series of separate knowledge tests, each with its own question count, passing threshold, and sometimes a time limit. The general knowledge test is almost always 50 questions with an 80% pass requirement. Air brakes adds 25 more, combination vehicles adds 20, and every endorsement brings its own separate exam of 20 to 30 questions. That 80% threshold applies to each test independently, there is no averaging your way to a pass.
State-level variations exist, especially around time limits and question counts in states like Texas that do not publish fixed figures. Always verify with your state's official CDL manual or DMV testing page rather than relying solely on third-party summaries. The FMCSA's guidance confirms that states develop and administer their own tests subject to federal minimums under 49 CFR Part 383, so the official state source is always the authoritative one.
Once you know how many questions are on the CDL permit test for each section and what the format demands, use a tool that replicates it. CDLTest360's timed 50-question simulations are built to match what you will face on exam day, with FMCSA-aligned content, a missed-question drill loop, and topic-specific modules for every section you need to pass. No surprises on exam day, just preparation that actually works. Visit CDLTest360 and start with the free trial to see exactly where you stand before your DMV appointment.
Frequently Asked Questions
If I fail one knowledge test, do I have to retake all the tests or just the one I failed?
You only need to retake the section you failed in most cases. We note that you typically keep credit for sections you passed and retake only the failed one, though specific retake rules, waiting periods, and fees are set by each state so you should confirm your state's policy.
Will passing the general knowledge test let me operate trucks with air brakes or combination rigs?
No, passing the general knowledge test does not authorize operation of vehicles with air brakes or combination rigs. We state that air brakes and combination vehicles are separate knowledge tests you must pass to remove restrictions and qualify for those vehicle types.
How should I pace myself during the CDL knowledge tests to avoid running out of time?
Pace yourself as if you have about one minute per question and avoid dwelling on any single item for more than two minutes. We recommend treating the general knowledge test as if it has a 50–60 minute window where reported, and using full timed practice tests to build that pacing habit beforehand.
Does the 80% passing score apply to the entire suite of tests collectively or to each test individually?
The 80% passing score applies to each test individually. We explain that you pass or fail each exam on its own merits and cannot average scores across tests to reach the required threshold.
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