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.. Read More

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 Michigan Commercial Driver License Manual. To pass, applicants must answer 40 questions correctly. Each question has 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 Question
Passing Score

1. If convicted of a traffic violation that suspends your driving privileges on your regular operator or chauffeur license:

Explanation
A CDL is a special driving privilege attached to a basic operator or chauffeur license. Therefore, any violation that results in the suspension or revocation of your license, even in a non-commercial vehicle, will also result in suspension or revocation of your CDL.

2. The two markings on a front brake limiting valve usually read:

Explanation
Some vehicles with air brake systems manufactured before 1975 have a front brake limiting valve with "normal" and "slippery" settings.

3. During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.

Explanation
It is important to know the maximum air loss rate that is safe for your specific vehicle. A triple combination should have a leakage rate no higher than 6 psi in a minute during an applied leakage test.

4. While driving:

Explanation
Texting while driving a CMV is prohibited. "Texting" is defined as manually entering text into, or reading text from, an electronic device.

5. A pre-trip inspection should include:

Explanation
When examining the engine compartment during a pre-trip inspection, you should check the engine oil level, the radiator coolant level, and the condition of the hoses.

6. When traveling down a downgrade, the speed of a vehicle will likely:

Explanation
The force of gravity will cause a vehicle's speed to increase when traveling downhill.

7. In a vehicle with dual air brakes, a leak in one system ____ the second system.

Explanation
A dual air brake system is made up of two separate air brake systems. If there is an air leak in one system, it may not affect the other.
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