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 Michigan Commercial Driver License Manual. 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

8. When driving on packed snow, you should reduce your speed by:

Explanation
Reduce your speed when traveling on surfaces that provide reduced traction. Reduce your speed by one-half or more when traveling on packed snow.

9. Cargo inside a trailer:

Explanation
Cargo inside a trailer must be secured appropriately to prevent it from shifting in transit.

10. Broken suspension parts:

Explanation
The suspension system holds up a vehicle and its load while keeping the axles in place. Defects in this system are extremely dangerous.

11. When driving a truck requiring a CDL:

Explanation
You must be properly restrained by a safety belt at all times when driving a commercial motor vehicle.

12. To avoid a hazard:

Explanation
In some emergencies, the best strategy for avoiding a hazard may be to drive onto the shoulder. Most shoulders are strong enough to support the weight of a large vehicle.

13. Radial and bias-ply tires:

Explanation
Radial and bias-ply tires should not be used together. All wheels on a vehicle should be the same style and equally-sized.

14. A slack adjuster should move no more than ____ from where it is attached to the push rod.

Explanation
Before a trip, you should check each slack adjuster after parking, setting wheel chocks, and disengaging the parking brake. Pull the slack adjusters to make sure that they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.
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