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 three or four possible answer choices. Test questions come from the Commercial Driver Guide. Questions come from chapters covering: Driving Safely, 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

1. 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.

2. Be sure that your wheel bearing/seals are:

Explanation
During an inspection, ensure that the wheel bearing/seals are not leaking.

3. To prevent trailers from rolling over, a driver should do all of the following, except:

Explanation
To reduce the risk of a rollover when pulling trailers, you should drive slowly when turning, drive slowly on curves, and generally steer gently and smoothly. When loading the trailers, you should keep the cargo as low to the ground as possible.

4. After a tire has been changed, the driver should stop after a short distance of driving to:

Explanation
Once you have begun to drive after a tire has been changed, you should stop after a short distance to recheck the tightness of the lug nuts.

5. Driving at night is usually:

Explanation
There are several reasons why driving at night is more difficult than driving during the day. It is more difficult for drivers to see hazards, the glare of headlights can affect drivers' vision, and there are more fatigued drivers on the road.

6. When a tire goes flat, you may hear a loud bang. The truck will be affected:

Explanation
There may be a delay of a few seconds between the sound of a tire failing and the time that the vehicle is affected by the tire failure. Because of the short delay, a driver may initially believe that the sound came from another vehicle.

7. If you are driving so slowly that you could impede other vehicles, you should:

Explanation
If you must drive slowly, you should use your emergency flashers to warn other drivers. Be sure that the use of emergency flashers is permitted by local laws.
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