Knowledge Test Class B

This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the.. Read More

This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the driver). To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has four possible answer choices. Test questions come from the North Dakota Commercial Driver Guide. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving.. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Number of Question
Passing Score

1. Which of the following is a sign of a potentially drunk driver?

Explanation
Warning signs that a driver may be impaired include that they are having trouble staying in their lane, they are having trouble maintaining an appropriate driving speed, or they are stopping without a clear reason.

2. While driving:

Explanation
It is essential that a driver always uses proper signals to make their intentions known to others on the road.

3. When backing with a trailer:

Explanation
When backing with a trailer, you should pull up to reposition your vehicle as needed.

4. Driving too fast:

Explanation
Driving at excessive speeds is a major cause of fatal crashes. Never drive above the posted maximum speed limit and adjust your speed to fit conditions.

5. Suspension system defects may include all of the following, except:

Explanation
Defects to check for when inspecting your vehicle's suspension system include cracked or broken spring hangers; missing or broken leaves in a leaf spring; and leaking shock absorbers. If you spot any of these issues, be sure to have them repaired.

6. Where is the safety relief valve usually located?

Explanation
An air brake system's safety relief valve is located in the tank that is first to receive air from the compressor.

7. Front brake limiting valves were intended to:

Explanation
Some older vehicles with air brakes have front brake limiting valves. These valves were intended to reduce the risk of front wheels skidding. However, research has shown that such devices are unnecessary, so they should be left in the "normal" position.
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