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The CDL general knowledge test is required to be taken by all CDL applicants. The Alabama 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 Alabama 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 AL 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. To warn drivers behind you that you will be slowing down, you should:
turn on the right and left turn signals at the same time.
turn on the 4-way emergency flashers.
tap your brake pedal a few times to flash your brake lights.
turn on the parking, clearance and side-marker lights.
2. When you need to brake, you should warn the drivers behind:
by making gestures.
by changing lanes.
by turning on the 4-way emergency flashers.
by flashing your brake lights.
3. You should do an after-trip inspection:
at least once a week.
after each stop.
after each trip.
once a month.
4. What factors can cause brakes to fade?
Excessive heat and brakes out of adjustment.
Gravel and tar.
Slippery surfaces and shaded areas.
Dirt roads and in unpaved yards.
5. Which of the following are possible causes of tire fires?
Over-inflated tires and short circuits.
Under-inflated tires and dual tires that touch.
Loose fuel connections or under-inflated tires.
Improperly loaded cargo and dual tires that touch.
6. When checking the steering system during your pre-trip inspection you should look for:
mismatched lock rings.
steering wheel play of more than 10 degrees.
cracked drums.
shoes or pads with oil or grease on them.
7. Right after it starts to rain, the road is very slippery. Why?
Because the water mixes with oil left on the road by vehicles.
Because black ice may form on the road.
Because rain is very slippery.
None of the above.
8. Retarders:
help slow a vehicle and reduce brake wear.
help prevent accidents by applying extra braking power to the non-drive wheels.
apply their braking power whenever you push on the accelerator.
All of the above.
9. Using a helper when backing up is:
not recommended.
10. If you do not have a cell phone or CB, the first thing you should do at an accident scene is to:
care for the injured.
clear the area.
protect the accident area.
gather Information for theĀ  accident report.
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Number of questions: 50
Correct answers to pass:40
Passing score:80%
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