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The CDL general knowledge test is required to be taken by all CDL applicants. The South Carolina 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 Carolina 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 SC 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. Which of the following is part of checking lights?
Turning on the headlights and four-way flashers.
Turning off the engine and taking the key with you.
Getting out of the vehicle.
All of the above.
2. Before transporting a sealed load, make sure:
that the load can be inspected.
that there is a picture of its contents.
that you don't exceed gross weight and axle weight limits.
All of the above.
3. You are driving on a two-lane road. If an oncoming driver has drifted into your lane:
you should downshift.
a move to your left is best.
you should brake as hard as you can.
a move to your right is best.
4. When you're going uphill and a heavy load is slowing you down, you should:
stay in the left lane if you can.
drive on the shoulder if you can.
pass another slow vehicle to gain speed.
shift into a lower gear.
5. Which of the following is NOT another name for convex mirrors?
Flat mirrors
Spot mirrors
Bug-eye mirrors
Fisheye mirrors
6. When you use mirrors while driving on the road, you should:
only use one mirror.
check quickly.
never look back and forth between the mirrors and the road ahead.
focus on the mirrors for a long time.
7. Air storage tanks:
hold compressed air for the brakes.
pump air into the air storage tanks.
are installed in the first tank the air compressor pumps air to.
use parts of the service brake systems to stop the vehicle in a brake system failure.
8. The best way to see the rear and sides of your vehicle is to:
check your mirrors regularly.
roll down your driver's window.
use your rear view camera.
roll down your passenger-side window.
9. A driver distraction is anything that takes your attention away from driving, such as:
adjusting the radio.
All of the above.
10. When conducting a pre-trip inspection:
the inspection report should only be reviewed if you will be carrying passengers.
you should review the last vehicle inspection report.
the vehicle inspection report should not be reviewed unless your supervisor tells you to do so.
None of the above.
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SC CDL Knowledge Test

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