CDL
Prep Test
North Carolina
Air Brakes
FAQ

Knowledge Test Class A

This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds. To receive this license, applicants must pass a 50-question test. Test questions come from the North Carolina Commercial Driver License Manual. To pass, applicants must answer 40 questions correctly. Each question has three or four possible answer choices. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination Vehicles, Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving. Endorsements that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, Doubles/Triples, HazMat, Tank, Air Brakes and School bus.

Number of Questions
49
Passing Score
40
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To Pass
0
Correct
0
Incorrect
0
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19. Vehicles with dual air brake systems:

Must be run to build enough air pressure to brakes to operate properly.
Maintain full-capacity air pressure in the braking systems even when the vehicle is not running.
Maintain some air pressure in the braking systems when the vehicle is not running.
Do not need time to build air pressure before a trip.
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21. The air storage tanks:

Do not hold air unless there is an emergency.
Hold only enough air for one braking cycle.
Hold enough air for brakes to be used several times if the compressor stops working.
Hold enough air for more than 1,000 braking cycles.
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