Double

This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice.. Read More

This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Each question has two, three or four possible answer choices. Test questions come from the Minnesota Commercial Driver’s Manual. Questions come from chapters covering: Driving Safely, Cargo, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.

Number of Question
Passing Score

8. When stopping, you should:

Explanation
When stopping, press down the brake pedal smoothly and gradually.

9. Which of the following types of vehicles is most prone to the “crack-the-whip" effect?

Explanation
Double and triple combinations are the most vulnerable to turning over as a result of the "crack-the-whip" effect.

10. In icy conditions, a retarder should be:

Explanation
A retarder may cause a skid when traction is poor, such as when a road is icy, and should therefore be turned off in such conditions.

11. When starting a trip while transporting a load, the driver should:

Explanation
The securement of cargo must be checked before beginning a trip, within the first 50 miles of a trip, and then again every three hours or 150 miles thereafter.

12. Tires of mismatched sizes:

Explanation
Having tires of mismatched sizes on a vehicle is a problem that should be fixed if discovered during a vehicle inspection.

13. When coming to a stop, you should apply the brake pedal by:

Explanation
When stopping, you should push the brake pedal down gradually. Braking gradually will help you to maintain proper control of your vehicle.

14. An emergency brake must be controlled by:

Explanation
All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes. Because air pressure can eventually leak away, emergency and parking brakes should be held on by mechanical force.
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