SC CDL GENERAL KNOWLEDGE TEST - CDL PRACTICE TEST

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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. To test the stopping action of your service brakes, go about:
5 mph.
25 mph.
50 mph.
15 mph.
2. When driving in very hot weather, the heat will increase the chances of:
suspension system defects.
ABS malfunction.
tire failure.
loss of hydraulic pressure.
3. Which of the following is true about high beams?
They should be used only if low beams suddenly stop working.
Using them seriously cuts down on your ability to see ahead.
High beams should be used when it is safe and legal to do so.
You should use them when you are not within 50 feet of an approaching vehicle.
4. A high center of gravity means:
you'll have better traction.
you are more likely to tip over.
the spring brakes will come fully on.
a rollover is less likely.
5. Which of the following is a tip to follow so you won't become a distracted driver?
Adjust all vehicle controls and mirrors while driving.
Engage in complex conversations with others.
Turn on all communication devices.
None of the above.
6. When checking the steering system during your pre-trip inspection you should look for:
cracked drums.
mismatched lock rings.
steering wheel play of more than 10 degrees.
shoes or pads with oil or grease on them.
7. If the air pressure gets too low:
you should set the parking brake.
the brakes will lock up.
ABS will help maintain vehicle control.
the brakes will not work.
8. The center of gravity of a trailer should be:
at the front of the trailer.
as low as possible.
at the rear of the trailer.
as high as possible.
9. Parking brakes are:
required on all vehicles.
not required on trailers.
not required on commercial vehicles with air brakes.
not required on buses.
10. Skids caused by acceleration can usually be stopped by:
taking the foot off the accelerator.
applying the brakes firmly.
speeding up.
coming to a complete stop.
 
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SC CDL Practice Test

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