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The CDL general knowledge test is required to be taken by all CDL applicants. The South Dakota 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 South Dakota 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 SD 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. Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
Spring hangers that allow movement of axle from proper position.
Damaged air suspension systems.
Broken leaves in a multi-leaf spring.
All of the above.
2. When traction is poor, as in rain or snow, you should speed up very gradually. If you don't:
brake pressure will push the rod out.
you will exceed the speed limit.
the brakes will not work.
you could lose control.
3. When driving on slippery surfaces, you should:
make turns as quickly as possible.
not pass slower vehicles unless necessary.
change lanes often.
All of the above.
4. In order to protect yourself and others, you must be aware that children may do something hazardous because:
they don't have a driving license.
they tend to like trucks.
they tend to act quickly without checking traffic.
they are often found in school zones.
5. Which of these should you check before driving in winter?
Coolant level and antifreeze amount
Windshield wiper blades
All of the above.
6. To maintain alertness while driving, you should:
avoid heavy foods.
have another person ride with you.
avoid medications that cause drowsiness.
All of the above.
7. Distracted driving can cause collisions. Which of the following can distract your attention while you are driving?
Driving below the speed limit.
Talking to passengers.
Listening to music.
All of the above.
8. Key suspension system parts include:
Bearing plates
Tie rod
Lock rings
All of the above.
9. You should schedule trips for:
any time that fits your schedule.
the hours you are normally awake.
the middle of the day.
the middle of the night.
10. When using a fire extinguisher on a fire, you should:
stay as far away from the fire as possible.
aim the extinguisher at the top of the fire.
get as close to the fire as possible.
All of the above.
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SD 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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