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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. How should you hold the steering wheel?
Firmly, with your hands on opposite sides of the wheel
Firmly, with your left hand at the top of the wheel and the right hand at the bottom of the wheel
With your right hand on the wheel
With your left hand on the wheel
2. The posted speed limit for a curve:
is safe for all vehicles.
is optional and may be exceeded.
is safe for trucks or buses, but it may be too fast for cars.
may be too fast for many trucks or buses.
3. You must have at least ________ tread depth on tires other than front tires.
4/16 inch
2/32 inch
4/32 inch
8/32 inch
4. Which of these statements about using your mirrors is FALSE?
There are blind spots that your mirrors cannot show you.
You should use your mirrors to spot overtaking vehicles.
When driving, you should check mirrors regularly to know where other vehicles are around you.
None of the above.
5. Which of these is a possible consequence of forcing an automatic transmission into a lower gear at high speed?
Loss of all engine braking effect
Loss of steering control
Loss of hydraulic pressure
All of the above.
6. An anti-lock braking system (ABS):
helps you avoid wheel lock up.
should help you steer around an obstacle while braking.
helps you avoid skids caused by over braking.
All of the above.
7. For a hazmat endorsement, applicants will be required to:
supply employment records for the last three years.
submit fingerprints and undergo a background check.
supply a list of the states visited within the last 3 years.
All of the above.
8. What is an advantage of going right instead of left around an obstacle?
If you are blocked on both sides, a move to the right won't force anyone into an opposing traffic lane and a possible head-on accident.
No one is likely to be passing you on the left, but someone may be driving on the shoulder.
There is no real advantage.
If an oncoming driver has drifted into your lane, their natural response will be to brake suddenly.
9. The Gross Combination Weight (GCW) is:
the weight of the vehicle, trailer, and cargo.
the weight of the trailer and cargo.
the weight of the vehicle and its trailer(s).
the total weight of a single vehicle including its load.
10. _______ is the distance your vehicle travels, in ideal conditions, from the time you see a hazard until your brain recognizes it.
Braking distance
Reaction distance
Perception distance
Total stopping distance
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TX CDL Practice Test

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