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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. Confused drivers can be very hazardous. Clues to confusion include:
driving very slowly.
changing direction suddenly.
stopping in the middle of an intersection.
All of the above.
2. The best advice for driving in fog is:
pass other vehicles on the right.
listen for fog-related warning signs.
do not drive.
turn on your 4-way emergency flashers and slow down before you enter fog.
3. If your vehicle catches fire while you are driving, you should:
park in an open area.
increase your speed to put out the fire.
immediately open the van or trailer doors.
pull into a service station.
4. When driving past parked vehicles, you should:
sound your horn.
turn on your taillights.
watch for clues that the parked vehicle is about to move.
stay close to the vehicles.
5. Which of these is true about fire extinguishers?
Check that the extinguisher is the correct type for the class of fire that may occur.
The fire extinguisher must be properly charged and rated.
You must study the instructions printed on the extinguisher before you need it.
All of the above.
6. ______ is responsible for the safe operation of a vehicle.
The mechanic
The driver
The supervisor
The vehicle owner
7. Two of the most common causes of tire fires are:
Duals that touch and under-inflated tires.
Loose lug nuts and duals that touch.
Driver smoking and bleeding tar.
Over-inflated tires and duals that touch.
8. When the spring brakes are on, you should:
not push the brake pedal down.
exceed the posted speed limit.
pump the brakes.
press the accelerator.
9. No matter how small the cargo is, it should have at least:
2 tie-downs.
4 tie-downs.
1 tie-down.
6 tie-downs.
10. What are some advantages of going right instead of left around an obstacle?
You can avoid a head-on collision.
There may be a shoulder that you can steer into.
Someone may be passing to the left.
All of the above.
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SC CDL Practice Test

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