Instructions

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 20

Passing Score 16

1. If a vehicle is equipped with power steering, the hoses should be checked:

For leaks.

To ensure that they are still clear.

To ensure that they are connected to the battery.

To ensure that they contain the proper amount of play.

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:

Removing the air supply knob.

Removing the rear shut-off valve.

Releasing air with the brake pedal.

Releasing air with the gas pedal.

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:

It is especially safe to drive.

The road will become more slippery.

Traction will increase.

It will be easier to identify slippery spots.

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:

Use your horn.

Use the low beam lights.

Use the high beam lights.

Use the heater.

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?

All shut-off valves should be open.

The rear shut-off valves should be open.

All shut-off valves should be in the open position, except the rear shut-off valves.

No shut-off valves should be open.

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.