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.. 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. To pass, applicants must answer 40 questions correctly. Each question has three or four possible answer choices. Test questions come from the South Dakota Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination, Doubles and Hazardous Materials. Endorsements that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.

Number of Question
Passing Score

8. If you are experiencing an engine fire, you should:

Explanation
In the event of an engine fire, you should turn off the engine as soon as possible. Do not open the hood unless absolutely necessary. Using a fire extinguisher, shoot foam through the louvers or radiator, or from the vehicle’s underside. If you are unsure of how to treat a fire, wait for firefighters to arrive.

9. Loading cargo:

Explanation
Regardless of who has loaded cargo onto a vehicle, the driver is responsible for the safety of the cargo.

10. When an engine is running, an acceptable oil pressure would be:

Explanation
Operating oil pressure should be between 35 and 75 psi. Do not operate a vehicle if it has oil pressure that is low, dropping, or fluctuating.

11. Heights posted at bridges:

Explanation
Never assume that the posted height on a bridge or other overhead object is correct. Even if it was accurate when posted, things may have changed that affect clearance, either permanently (such as a repaving of the road) or temporarily (such as packed snow on the road).

12. A steering wheel should be:

Explanation
A steering wheel should be held firmly with each hand on opposite sides of the wheel.

13. A dual air brake system:

Explanation
A dual air brake system has two separate air brake systems that use a single set of brake controls. One system typically operates the regular brakes on the rear axle or axles. The other system operates the regular brakes on the front axle.

14. While driving, ____ generally holds spring brakes in place.

Explanation
While driving, spring brakes are generally held in place by air pressure. If the air pressure gets low enough, the springs will activate the brakes.
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