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The CDL general knowledge test is required to be taken by all CDL applicants. The California CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the California CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual CA general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. When approaching a traffic light that has been green for a long time, you should:
speed up to get through the light.
maintain your current speed.
start slowing down and be ready to stop.
2. Glad hands are:
warning devices.
coupling devices.
securement devices.
3. When you have to back, you should always try to back toward the driver's side because:
backing toward the left side is more dangerous.
you can see better and watch the rear of your vehicle out the side window.
None of the above.
4. If you are traveling at 55 mph in a 30 foot vehicle, how many seconds of following distance should you have?
3 seconds
4 seconds
5 seconds
5. Road surfaces where water collects can create conditions that cause a vehicle to hydroplane. Which of the following is an indication of standing water?
Clear reflections
Tire splashes
All of the above.
6. When a tire fails, do NOT:
stay off the brake until the vehicle has slowed down.
keep a firm grip on the steering wheel.
brake, unless you're about to run into something.
7. Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = ?
Stopping Distance - (minus) Brake Fade Distance
Total Stopping Distance
Total Air Pressure
8. When the spring brakes are on, you should:
pump the brakes.
not push the brake pedal down.
press the accelerator.
9. How can you determine your following distance?
When the vehicle ahead of you passes a stationary object on the side of road, start counting the seconds it takes you to reach that same object.
Pass a stationary object and count how many seconds it takes the vehicle ahead of you to reach that same object.
When the vehicle ahead of you passes a stationary object such as a sign along the road, use the stopwatch on your smartphone to determine how long it takes you to reach that same object.
10. What should you do at an accident scene, among other things, to help prevent another accident?
Stay in your vehicle and file an accident report.
If you are stopping to help, park in the area immediately around the accident.
Put on your 4-way emergency flashers.
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CA CDL Practice Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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