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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. When using a fire extinguisher, you should:
Aim at the flames.
Aim at the base of the fire.
Keep as close to the fire as possible.
All of the above.
2. When you discover a fire, if the trailer doors are hot you should not open them because:
the temperature of the trailer should not be changed in any way.
you should use the fire extinguisher on the door.
with air many fires do less damage.
opening the doors lets air in and may make the fire flare up.
3. If a tire blows out, you should:
keep a firm grip on the steering wheel and stay off the brake until the vehicle has slowed down.
immediately head for the side of the road.
fully apply the brakes while holding the steering wheel firmly.
keep driving until you reach the next service station.
4. If your trailer starts to skid, you should:
use the trailer hand brake (if you have one) to straighten out the rig.
accelerate slightly.
release the brakes to get traction back.
keep the rear of your vehicle close to the curb.
5. When you pull off the road and stop, you should:
flash your brake lights.
use the taillights.
use your high beams.
turn on the 4-way emergency flashers.
6. A steering wheel play of more than ___ degrees can make it hard to steer.
7. Escape ramps are:
used by vehicles exiting the expressway.
reserved for vehicles carrying dangerous goods.
used to stop runaway vehicles safely.
reserved for combination vehicles.
8. Which of the following should be checked for looseness, sticking, damage, or improper setting?
Steering wheel
All of the above.
9. The Johnson bar is a valve that:
works the trailer brakes.
keeps air from going out if the air compressor develops a leak.
is installed in the first tank the air compressor pumps air to.
reduces the braking pressure to a safe level.
10. Whether or not they load and secure the cargo themselves, drivers are responsible for:
recognizing poorly balanced weight.
knowing the cargo does not obscure the view ahead or to the sides.
making sure the cargo does not restrict access to emergency equipment.
All of the above.
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AL CDL Knowledge Test

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