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. Each question has four answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Texas Commercial Motor Vehicle Drivers Handbook. 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. When turning quickly to avoid an object in the roadway, you should:

Apply your brakes as you steer.

Give yourself extra clearance by turning more than needed to miss the object.

Turn just enough to miss the object and avoid turning more.

Steer and accelerate at the same time.

When turning quickly to avoid an object, turn only as much as is necessary to clear it. Do not apply the brakes while turning.

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. Before starting down a hill, be sure to:

Accelerate.

Switch into a high gear.

Sound your horn.

Switch into a low gear.

Before starting down a hill, be sure to switch into a low gear. Gravity will increase your vehicle's speed as you travel downhill.

4. What can happen if a parking brake is used in very wet weather when temperatures are below freezing?

The brakes will squeak.

The brakes may freeze so the vehicle cannot move.

The brakes may suddenly release by themselves.

The brakes may explode.

If you use the parking brakes when the weather is very wet and the temperature is below freezing, the brakes may become frozen, preventing the vehicle from moving.

5. The service air line is attached to the:

Relay valves.

Supply line.

Emergency air line.

Steering wheel.

The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.

6. If you don't pull the dolly out from beneath the rear trailer before unlocking the pintle hook:

The tow bar may cause injury.

The landing gear may break.

The pintle hook may detach.

Nothing bad could happen.

Never unlock the pintle hook with the dolly still under the rear trailer. This could cause the dolly tow bar to fly up, possibly causing serious injury.

7. When a combination vehicle goes around a corner:

The turn should be made as tightly as possible.

The front and rear wheels move in different paths.

The rear wheels should run over the curb.

It is acceptable for street signs to be knocked over if they are too close to the road.

When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called off-tracking. This effect is especially pronounced on vehicles with trailers.

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