View instructions
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. The only way to stop a front-wheel skid is to:
let the vehicle slow down.
supply more power to the drive wheels.
2. ABS brakes help you:
avoid wheel lock up.
downshift before starting down a hill.
lock up the wheels in an emergency stop.
3. When driving at night you should:
use your high beams when it is safe and legal to do so.
always use low beams.
All of the above.
4. Drivers should check and adjust their mirrors:
before starting a trip.
while driving.
after a trip.
5. Air tank drains:
are used to remove water and oil from the air tanks.
should not be used in wet weather.
protect the tanks and the rest of the system from too much pressure.
6. To test your hydraulic brakes for leaks:
apply firm pressure to the brakes for five seconds, then pump them three times.
pump the brake pedal three times, then hold it down for five seconds.
turn off the engine and and listen for leaks.
7. Which of these vehicles must come to a complete stop at railroad grade crossings?
School buses
Heavy equipment
All of the above.
8. Distracted driving may be caused by _________ while driving.
adjusting the radio
reading billboards
All of the above.
9. You should NOT use the parking brakes if:
the brakes are very hot.
the brakes are cold.
the brakes are too dry.
10. If your vehicle is equipped with a retarder, you should turn it off:
when you are driving in heavy traffic.
whenever the road is wet, icy, or snow covered.
when you are running late.
Page 1 of 5
Next page

AZ CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
Share This Online CDL Test
Rate this CDL Knowledge Test
4.9 out of 5
based on 287 votes