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The CDL general knowledge test is required to be taken by all CDL applicants. The North 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 North 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 NC 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 not use your horn unnecessarily. Why?
On vehicles possessing air brakes, it uses up air pressure you may need to be able to stop
The horn on a vehicle wears out very quickly
The horn can startle other drivers, which could be dangerous.
All of the above.
2. If an aggressive driver is involved in an accident down the road, you should:
try to get their vehicle to the side of the road.
make eye contact with the driver.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
confront the aggressive driver.
3. Which of the following is checked in a pre-trip inspection?
Steering wheel
Wiper blades
Mirrors and windshield
All of the above.
4. When going down a hill, you should downshift:
before you start going downhill.
at the bottom of the hill.
as you go downhill.
after starting down a hill.
5. The application pressure gauge:
shows how much air pressure is being applied to the brakes.
protects the tank and the rest of the system from too much pressure.
tells you how much pressure is in the air tanks.
stops the compressor from pumping air.
6. Blood Alcohol Concentration (BAC) is determined by:
the amount of alcohol you drink.
the type of alcohol you drink.
how frequently you drink.
All of the above.
7. If you are convicted of a traffic violation (except parking) in your personal vehicle:
you don't have to tell your employer.
your commercial driver license will not be affected.
you must make a written report.
you must tell your employer.
8. Air tank drains:
protect the tanks and the rest of the system from too much pressure.
are used to remove water and oil from the air tanks.
should not be used in wet weather.
are used to move air to the brakes.
9. If a worker is close to the roadway in a work zone, you should:
drive at the posted speed limit.
reduce your speed below the posted speed limit.
pull off the road and stop.
drive on the shoulder.
10. When is it safe to remove the radiator cap?
As soon as you've stopped, as long as the engine is not hot.
It is always safe.
When you can touch the radiator cap with your bare hand.
Whenever coolant has to be added to the system.
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NC CDL Knowledge Test

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