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 three or four possible answer choices. Test questions come from the State of Delaware Commercial Driver 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. All air tanks must include:

A drain valve.

A lock.

A trap door.

A warning sticker.

Air brake system tanks must contain drain valves. These valves are used to drain accumulated oil and water from the tanks and may be either manually or automatically operated.

2. Most drivers are the least alert:

In the morning.

In cold weather.

At night.

After work.

Fatigue and lack of alertness are major hazards when driving at night. Most people are the least alert at night, especially after midnight.

3. When coupling together two trailers, you can secure the second trailer by:

Backing the trailer into a wall.

Setting the trailer emergency brakes.

Placing wheel chocks on the sides of the tires.

If you are attaching a second trailer to a combination but the trailer is not equipped with spring brakes, you can set the trailer emergency brakes. You can do this by connecting the first and second trailers' emergency lines, charging the air tank, then disconnecting the emergency lines. This should set the emergency brakes, as long as the slack adjusters are properly adjusted.

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

Should be placed on an incline.

Should be placed on a decline.

May have to be running.

Should be lifted with a jack.

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

5. To avoid becoming an aggressive driver, you should:

Plan trips without allocating extra time for traffic.

Tailgate.

Drive slowly in the left lane.

Not make gestures to other drivers.

To avoid becoming an aggressive driver, begin a trip with realistic expectations of how long the trip will take, allowing extra time for traffic delays. Do not tailgate other vehicles. To avoid upsetting other drivers, do not drive slowly in the left lane and do not gesture at the drivers (even in seemingly minor ways, like shaking your head).

6. When backing with a trailer, turning toward the driver’s side is encouraged because:

The driver will have the best possible view.

Power lines should be on the passenger's side.

Other drivers can offer assistance on the passenger's side.

When driving in reverse, it is always recommended that a driver backs their vehicle toward its left side. This will allow the driver the best possible view of the rear of their vehicle.

7. Roads are slippery when it first begins to rain because:

Water is slippery.

The fresh rain mixes with oil on the roadway.

The water has nowhere to go.

Concrete can be slippery.

Roads are especially slippery when it first begins to rain. Rain water initially mixes with oil and grease on the road to form a slippery film. As the rain continues, this mixture will eventually wash away.

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