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The CDL general knowledge test is required to be taken by all CDL applicants. The Arizona 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 Arizona 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 AZ 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 backing, it is best to:
use only the passenger's side mirror.
try to back in the direction of the drift.
use a helper whenever possible.
2. In vehicles with air brakes, the air compressor governor:
controls when the air compressor will pump air into the air storage tanks.
controls how much air the air compressor will pump into the air storage tanks.
controls when the air storage tanksĀ will pump air into the air compressor.
3. Which of the following statements about accelerating is TRUE?
Rough acceleration can cause mechanical damage.
When traction is poor, you should avoid speeding up gradually.
If the drive wheels begin to spin, speed up to regain traction.
4. Hydroplaning:
only occurs at speeds above 55 mph.
is more likely when tire pressure is low.
is more likely to occur when tire tread is in good condition.
5. When driving through a large puddle or flowing water, you should:
increase engine rpm.
slow down.
All of the above.
6. Axle weight is:
the maximum safe weight a tire can carry at a specified pressure.
the weight of one axle.
the weight any axle or combination of axles transmits to the ground.
7. Which of the following is a common cause of fire?
Under-inflated tires and duals that touch.
Short circuits due to loose connections.
All of the above.
8. When only the tractor has ABS:
the trailer is less likely to swing out.
you should be able to maintain steering control during braking.
there is a greater chance of jackknifing.
9. You should you NOT sound your horn:
to tell other drivers that they made a mistake.
to alert another driver to your presence.
to alert another driver to a potential problem.
10. Hanging meat in a refrigerated truck can be:
a very stable load if properly distributed.
a very unstable load with a high center of gravity.
a very unstable load with a low center of gravity.
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AZ 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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