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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. You should schedule trips:
between the hours of 6 a.m. and 6 p.m.
between the hours of 9 a.m. and 10 p.m.
between the hours of 11 a.m. and midnight.
for the hours you are normally awake.
2. To prevent rolling back when you start, if you have a manual transmission you should:
never the parking brake.
partly engage the clutch before you take your right foot off the brake.
use the lowest reverse gear.
3. The one-way check valve:
keeps the axles in place.
keeps air from going out if the air compressor develops a leak.
supplies air to the trailer air tanks.
keeps your wheels from locking up when you brake hard.
4. Using a helper when backing up is:
not recommended.
5. If ABS is not working:
you should stay off the brake.
a yellow malfunction lamp will light up on the control panel.
you should pump the brakes.
the brakes will lock up.
6. When driving in heavy rain, your brakes will get wet. Water in the brakes can cause:
the brakes to apply unevenly.
lack of braking power.
wheel lockups.
All of the above.
7. In a convex mirror everything appears:
8. Empty trucks have _________ heavily loaded trucks.
less traction than
the same traction as
half the traction than
more traction than
9. When parked on the side of the road, you should:
activate the right turn signal.
flash your brake lights.
turn off all lights.
use the 4-way emergency flashers.
10. Drivers should inspect their cargo and its securing devices within the first _______ after beginning the trip.
50 miles
15 miles
25 miles
100 miles
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TX CDL Knowledge Test

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