Pass Your CDL Permit General Knowledge Tests

Understanding General Knowledge Tests

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Core Permit Tests

Know what each test covers before you sit for the exam.

General Knowledge.

Defensive driving, inspections, vehicle control, cargo securement, regulations.

Air Brakes

System components, inspections, low air procedures, stopping distances.

Combination Vehicles

Coupling/uncoupling, rollover prevention, trailer inspection.

You must pass knowledge exams before your CLP and skills test. This guide breaks down the General Knowledge, Air Brakes, and Combination Vehicles exams so you can prepare efficiently and pass on the first try.

How to Prepare for Your CDL Permit Tests

Study the official manual, take FMCSA-compliant online theory, and use practice exams. Create a study schedule and reinforce weak areas before test day.

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What to Expect from Your CDL Permit Tests

Before you can move on to the practical, hands-on training, or in some cases, your Theory, you must prove you have a foundational understanding of commercial driving principles by passing a series of knowledge exams. These tests are administered at your local DMV or equivalent state licensing agency. They are computer-based and typically consist of multiple-choice questions.

The number of tests you take depends on the type of CDL you are pursuing:

For a Class A CDL Permit: You must pass the General Knowledge, Air Brakes, and Combination Vehicles tests.

For a Class B CDL Permit: You must pass the General Knowledge and Air Brakes tests.

Permit Prep Made Practical

Focused study guides, practice tests, and ELDT theory keep you compliant and confident for the DMV exams.

Test-Specific Prep.

Target General Knowledge, Air Brakes, and Combination with purpose-built study.

Online & Self-Paced

Train when it fits your schedule with tracked progress.

Compliance Ready

ELDT theory completion before BTW sign-off.

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General Knowledge Test

This is the most important and comprehensive test, required for all new CDL applicants. It is typically a 50-question exam, and you must achieve an 80% score (40 correct answers) to pass. The test covers a wide range of topics that every commercial driver needs to know:

Driving Safely: Defensive driving techniques, managing speed and space, and handling various weather conditions.

Vehicle Inspection: How to perform thorough pre-trip, en route, and post-trip inspections.

Basic Vehicle Control: Understanding shifting, backing, and other foundational maneuvers.

Transporting Cargo Safely: Principles of proper cargo securement, weight distribution, and load limits.

Regulations: Key federal and state rules, including Hours of Service (HOS) rules and drug and alcohol policies.

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Air Brakes Test

Nearly all modern Commercial Motor Vehicles (CMVs) are equipped with air brakes. You must pass this test to have the air brake endorsement on your cdl permit and remove the "L" air brake restriction from your license. This test typically has around 25 questions, with a passing score of 80% (20 correct answers). It covers how the air brake system works, how to inspect it, and how to handle a low air pressure emergency.

Combination Vehicles Test

Class A CDL Prerequisite

This test is specifically for those pursuing a Class A CDL. It focuses on the unique challenges and safety procedures associated with operating combination vehicles, such as a tractor-trailer. The test covers how to safely couple and uncouple the vehicle, preventing rollovers, and inspecting the combination vehicle's air brake system.

How to Prepare for Your CDL Permit Tests

Preparing effectively for these tests is essential to ensure you pass on your first attempt. Here are some of the best strategies:

Study the Official Manual: Each state publishes its own CDL manual, which is the primary source of all information on the tests. It's available online from your state's DMV website.

Take Online Theory Courses: An FMCSA-compliant online theory course, such as the one offered by ELDT.com, covers all the necessary material in an organized, self-paced format. ELDT theory training is a required step for all new drivers and can greatly reinforce the information you need to do better on your General Knowledge Tests. Since you are already studying for your CLP, this is an excellent way of getting the information you need to do better on your general knowledge tests and can lead to better scores.

Utilize Practice Tests: Taking practice tests is one of the most effective ways to study. It helps you become familiar with the format of the questions, identify areas where you need more study, and build confidence before you take the real exam. ELDT.com has a Permit Prep Exam on sale for $10, and it can be combined with your ELDT Theory.

Create a Study Schedule: Break down the manual into manageable sections and dedicate specific time each day to studying. Consistency is key to retaining information.

Start Your CDL Journey By passing the Permit Tests

Passing your CDL permit tests is the first major step toward a career in commercial driving. By utilizing the right resources and dedicating time to study, you can confidently pass your exams and get one step closer to earning your full CDL.

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