Combination #1
Combination Vehicles Practice Test | North Carolina 2025 #1 Page 4 of 4
Train for FREE online with our North Carolina CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a NC combination license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.
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19 . The trailer hand valve should be used:
To test the lights on the trailer.
The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes.
20 . To test the trailer service brakes, you should:
Move the vehicle forward slowly and apply the brakes with the hand control.
To test the trailer service brakes, you should first ensure that the braking system has a normal air pressure level, then release the parking brake. You should then move the vehicle forward slowly and apply the brakes with the hand control. If the trailer service brakes are working properly, you will feel the brakes activate.
21 . The service air line is attached to the:
Steering wheel.
The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.
22 . Driving a combination vehicle ____ than driving a single vehicle.
Is safer in inclement weather
Driving a combination vehicle usually requires more skill than driving a single vehicle. Combination vehicles are generally longer and heavier than single commercial vehicles.
23 . If an air supply control is in its "emergency" position:
Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "emergency" position, the air supply will be stopped and the trailer emergency brakes will be applied.
24 . Before a trip, you can make sure air flows to all trailers by:
Before a trip, ensure that air in the air brake system reaches all trailers. Do this by waiting for air pressure to build, then sending air to both the emergency and service lines and opening the shut-off valves on the rear of the last trailer. If air escapes from the shut-off valves in the rear of the combination, the air is being supplied to the entire vehicle.
25 . When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
When connecting a converter dolly to a second or third trailer, the trailer height should correct. It should be slightly lower than the center of the fifth wheel.
See the exact questions that will be on the 2025 North Carolina DMV exam.
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2025 North Carolina | Frequently Asked Questions
A CDL Class B license in North Carolina permits the holder to operate commercial vehicles weighing more than 26,000 pounds and towing vehicles not exceeding 10,000 pounds. This includes buses, farm labor vehicles, and any vehicle designed to transport 24 passengers or more, including the driver. Endorsements may be required for certain vehicles.
A Class B CDL license in North Carolina allows you to operate single or combination vehicles where the single vehicle weighs over 26,000 pounds. This includes straight trucks, large buses, segmented buses, box trucks, dump trucks with small trailers, and any vehicle designed to transport 24 passengers or more including the driver.
To acquire a Class B CDL license in North Carolina, you must be at least 18 years old (21 for interstate driving), possess a valid North Carolina driver's license, pass a DOT medical examination, successfully complete the CDL general knowledge test, and pass the skills test in the type of vehicle you plan to drive. A clean driving record is also essential.
In North Carolina, to qualify for a Class B CDL license, you must be at least 18 years old for intrastate transportation (within state lines) and at least 21 years old for interstate transportation (across state lines). Additionally, you must pass a medical examination and have a clean driving record.
Specific endorsements aren't necessary for a Class B CDL license in North Carolina but may be required based on the type of vehicle you plan to drive or cargo you're transporting. For example, you'd need a Passenger (P) endorsement to drive a bus or a Hazardous Materials (H) endorsement to transport HazMat. Each endorsement requires additional testing.
The Class B CDL skills assessment in North Carolina includes a pre-trip vehicle inspection, a basic vehicle control test, and an on-road driving test. You'll need to demonstrate your ability to inspect your vehicle, control it in different situations, and drive it safely on the road, following all traffic rules and regulations.
Yes, Class B CDL license holders in North Carolina are limited to operating vehicles with a GVWR of 26,001 pounds or more, or any such vehicle towing a vehicle not in excess of 10,000 pounds GVWR. They can't drive a combination of vehicles (like a tractor-trailer) that would require a Class A CDL. Also, additional endorsements may be needed for certain types of vehicles or cargo.
No, North Carolina does not offer the written Class B CDL test in languages other than English. This is due to Federal Motor Carrier Safety Regulations which require drivers to read and speak English sufficiently to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, you can request accommodations for the Class B CDL written exam in North Carolina due to disability. The Division of Motor Vehicles is committed to ensuring that its services are accessible. However, you must provide proper documentation of your disability and specify the type of accommodation needed. Contact your local DMV office for detailed information.
Yes, if you fail the Class B CDL written test in North Carolina, you can retake it. However, you must wait at least 5 days between attempts. There is no limit to the number of times you can retake the test, but each attempt requires a new fee. It's recommended to study thoroughly before retaking the test.
