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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. You should downshift:
before starting down a hill or entering a curve.
before starting up a hill.
before exiting a curve.
None of the above.
2. During a walk around inspection, which of the following should you check?
Condition of wheel and rim.
Condition of the front axle.
Shock absorber condition.
All of the above.
3. Hydroplaning is most likely to occur:
at speeds below 30 mph.
when it's been raining for over an hour.
right after it starts to rain.
right before it starts to rain.
4. In the event of brake failure you should NOT:
use the parking brake.
pump the brakes.
downshift.
shift up.
5. When backing you should:
use driver-side backing.
avoid making pull-ups to reposition your vehicle.
not use a helper.
back and turn toward the right side.
6. When crossing railroad tracks, you should:
apply the parking brakes.
stop on the tracks.
stay in your lane.
shift gears while crossing the tracks.
7. If you will be transporting hazardous materials that require placards, you must:
obtain a special transit permit.
ask permission of the local transportation agency.
obtain a hazardous materials endorsement.
transport the materials at night only.
8. When you park, you should try to park:
so you'll be able to pull forward when you leave.
on the shoulder of the road.
so there is enough room to back out.
None of the above.
9. If your vehicle is hydroplaning, you should:
use the brakes to slow down.
accelerate to get through the water as quickly as possible.
release the accelerator and push in the clutch.
None of the above.
10. If driving a vehicle equipped with power steering, you should check:
fluid level.
hoses.
check pumps.
All 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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