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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. When inspecting your vehicle, before checking the engine compartment be sure that:
all tires are properly inflated.
all lights are working.
the fire extinguisher is properly charged and rated.
the parking brakes are on and/or wheels chocked.
2. When transporting cargo, you are NOT responsible for:
recognizing poorly balanced weight.
the price of the cargo.
inspecting your cargo.
ensuring that cargo is loaded safely and securely.
3. Before driving a vehicle with a dual brake brake system, the driver should:
wait at least 5 minutes before driving.
wait at least 10 minutes before driving.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
pump the brake pedal 10 times to build pressure.
4. You need to pay special attention to the space below your vehicle:
on multi-lane roads.
in no passing zones.
on dirt roads.
in school zones.
5. When you use mirrors while driving on the road, you should:
check quickly.
never look back and forth between the mirrors and the road ahead.
only use one mirror.
focus on the mirrors for a long time.
6. When you are driving very slowly you should:
avoid braking.
use the 4-way emergency flashers.
not use any lights.
stay in the left lane.
7. If the coolant container is not part of the pressurized system:
you can safely remove the cap and add coolant even when the engine is hot.
you should never remove the radiator cap or any part of the pressurized system until the system has cooled.
you should remove the container cap and wait until the system has cooled.
None of the above.
8. During a pre-trip inspection, to check your lights you should:
with the engine running, put the vehicle in a forward gear and turn on the headlights.
with the engine running, turn on the headlights and 4-way emergency flashers, and get out of the vehicle.
check the yellow malfunction lamps on the instrument panel.
turn off the engine, turn on the headlights and 4-way emergency flashers, and get out of the vehicle.
9. Which of the following statements about alcohol is TRUE?
Taking a cold shower will help sober you up.
Drinking black coffee will help sober you up.
Time is the only method that works to sober you up.
Most people can drink 2 beers without affecting their driving ability.
10. Stab braking cannot be used in vehicles with:
anti-lock brakes.
spring brakes.
parking brakes.
air brakes.
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NC CDL Knowledge Test

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