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The CDL general knowledge test is required to be taken by all CDL applicants. The Texas 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 Texas 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 TX 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. Antifreeze:
doesn't help the engine in any way.
helps the engine only when the temperature is below freezing.
helps the engine only under hot conditions.
helps the engine under hot conditions as well as cold conditions.
2. Under-loaded front axles can:
cause poor traction.
make the steering axle weight too light to steer safely.
cause the drive wheels to spin easily.
All of the above.
3. Texting is:
safer than talking on a cell phone.
the most dangerous distraction.
safer than  engaging in conversation with a passenger.
about as safe as adjusting the radio.
4. Name two causes of tire fires.
Mismatched tires and road debris.
Under-inflated tires and dual tires that touch
Excessive braking
Driver smoking and poor ventilation.
5. You should check wheel bearing seals for:
gasoline.
broken leaf springs.
illegal stickers.
leaks.
6. Strong winds can make it difficult to stay in your lane especially when driving:
flatbed trailers.
heavier vehicles.
vehicles with ABS.
lighter vehicles.
7. _______ is the act of operating a motor vehicle in a selfish, bold, or pushy manner, without regard for the rights or safety of others.
Road rage
Defensive driving
Aggressive driving
Distracted driving
8. You should signal your intention to turn at least ____ before turning or changing lanes.
50 feet
100 feet
250 feet
75 feet
9. When should you use the 4-way emergency flashers instead of flashing the brake lights to warn the drivers behind you?
When driving in strong winds.
When you are driving very slowly or are stopped.
When visibility is poor.
At night time.
10. After starting the engine, the ABS light stays on. This means:
the ABS is working properly.
the ABS is not working properly.
the ABS oil level is not adequate.
the ABS is in Neutral.
 
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TX CDL Knowledge Test

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