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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. If you are driving a 50 foot truck and you are traveling at 55 mph, you should have at least _________ of following distance.
3 seconds
5 seconds
6 seconds
12 seconds
2. You as a driver should always:
stay in your lane.
make emergency plans when you see a hazard.
drive slowly in the left lane of traffic.
reduce your following distance.
3. Which of the following helps keep the engine cool in hot weather?
Driving faster to force more air into the radiator.
Making sure there is enough engine oil.
Making sure the anti-lock braking system is on.
All of the above.
4. During a pre-trip inspection, when checking the power steering hoses, you should:
look for broken or distorted coil springs.
check for damaged or bent rims.
check for leaks.
check that the brake chambers are not leaking.
5. When the spring brakes are on, you should:
not push the brake pedal down.
press the accelerator.
exceed the posted speed limit.
pump the brakes.
6. The distance you will continue to travel, in ideal conditions, before you physically hit the brakes in response to a hazard ahead is called:
Braking distance
Perception distance
Stopping distance
Reaction distance
7. If you need to make a large steering adjustment while using controlled braking, you should:
pump the brakes and keep the wheels locked up.
downshift and keep braking.
release the brakes.
keep braking as hard as you can while steering.
8. Stab braking:
involves applying the brakes as hard as you can without locking the wheels.
involves steady pressure on the brake pedal without locking the wheels.
involves applying the brakes all the way, and releasing them when wheels lock up.
should never be used.
9. The most common type of brake is the:
G-cam disc brake
R-cam drum brake
B-cam disc brake
S-cam drum brake
10. Which of the following statements about drinking alcohol is true?
The BAC measures the amount of alcohol in your body.
Alcohol first affects judgment and self-control, which are necessary for safe driving.
Only time will sober you up.
All of the above.
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NC CDL Knowledge Test

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