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 four possible answer choices. Test questions come from the West Virginia Commercial Driver’s License Manual. 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. If a vehicle is equipped with power steering, the hoses should be checked:

Explanation
When inspecting a vehicle with power steering, you should inspect the hoses, pumps, and fluid levels. Specifically check the hoses for leaks.

2. Before a trip, you should test the tractor protection valve by:

Explanation
You should test the tractor protection valve by allowing the air supply to properly charge, turning off the engine, then releasing air from the system by pressing the brake pedal several times. The tractor protection valve should move into its emergency position when psi drops to an unsafe level.

3. As temperatures begin to rise and ice on road surfaces begin to melt:

Explanation
Ice that is wet because it has just begun to melt is much more slippery than ice that is not wet. Use additional caution when driving on melting ice.

4. When driving in fog, you should:

Explanation
If you must drive in fog, you should use your low beam headlights and fog lights to maximize your visibility. Using high beam lights will only make it more difficult for you to see.

5. During a trip, which shut-off valves should be open?

Explanation
When starting a trip, be sure that all shut-off valves are in the open position, except for the last valves on the rear trailer. It is important that air reaches the brakes on all trailers and that the air is not able to escape from the back of the vehicle.

6. What does the air compressor governor do?

Explanation
In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.

7. When checking its automatic transmission fluid, the vehicle:

Explanation
Your vehicle's engine may need to be running in order for you to check the level of its automatic transmission fluid.
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