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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. In a dual air brake system, if one air system is very low on pressure:
you should drive and brake as you always have.
either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
the effect won't be noticeable for the first 50 miles.
2. Name some exhaust system parts.
Drag link, spindle and gear box
Mufflers, mounting brackets and vertical stacks
Main spring, axle and font axle hanger
Pitman arm, hydraulic fluid reservoir and tie rod
3. Your total stopping distance consists of __________ plus reaction distance plus braking distance.
following distance
perception distance
passing distance
partial stopping distance
4. To stay alert and safe while driving, you should:
avoid any drug that hides fatigue.
always drive alone, if possible.
drive at night, if possible.
drink coffee if you get drowsy.
5. Which of the following statements about using turn signals is true?
To keep others from trying to pass you, you should signal just before you turn.
To turn safely you must keep one hand on the wheel.
You should use your turn signals when your vehicle is parked at the side of the road.
None of the above.
6. Confused drivers may:
change lanes for no apparent reason.
stop without warning.
change direction suddenly.
All of the above.
7. Aggressive driving is the act of:
operating a vehicle in the left lane.
operating a vehicle at a safe speed.
operating a vehicle at night.
operating a vehicle in a selfish or pushy manner.
8. Hazardous materials can be recognized by looking at the container's:
9. To prevent getting sleepy while driving, you should:
keep cool by opening the window.
drive alone whenever possible.
close the vent.
keep the cab warm.
10. What is Gross Vehicle Weight (GVW)?
A vehicle's maximum weight rating, specified by its manufacturer.
The total weight of a vehicle, including that of any trailers.
The total weight of a single vehicle including its cargo.
None of the above.
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CDL Knowledge Test AL

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