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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. To prevent rollover, you should:
place the cargo near the front of the trailer.
keep the cargo as close to the ground as possible.
place the cargo near the rear of the trailer.
put the lightest parts of the cargo under the heaviest parts.
2. You as a driver should always:
drive slowly in the left lane of traffic.
stay in your lane.
make emergency plans when you see a hazard.
reduce your following distance.
3. Too much weight on the steering axle can cause:
better handling.
poor traction.
hard steering and damage to the steering axle and tires.
None of the above.
4. With a dual air brake system:
each system shares the same lines and hoses.
each system shares air tanks.
each system has its own air tanks, hoses and lines.
one system is the main braking system while the other is a back-up system.
5. When steering to avoid a crash, you should:
not turn any more than needed to clear the hazard.
apply the brake while you are turning.
accelerate and steer at the same time.
lock your wheels while turning.
6. When driving on a long and/or steep downgrade, drivers should:
select an appropriate safe speed, and then use a low gear.
use a low gear and release the brakes.
release the clutch.
7. Antilock brakes:
help you stop faster.
decrease your stopping distance.
let you drive faster.
None of the above.
8. When drivers make a turn they should:
look behind the vehicle.
look in the direction they are going to turn.
look in the opposite direction of the turn.
look far ahead.
9. How should you apply the brakes when going down a steep downgrade?
Apply the brakes as hard as you can without locking the wheels.
You should not brake, and only use engine braking to prevent brake failure.
Apply the brakes when you reach the bottom of the downgrade.
Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
10. If your trailer starts to skid, you should:
steer in the opposite direction.
pump the brakes.
release the brakes.
lock the brakes.
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SD CDL Knowledge Test

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