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 Montana 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. Before coupling, you can secure a second trailer by:

Depleting its air tanks.

Leaning it against a wall.

Removing its emergency line.

Setting wheel chocks.

If you are attaching a second trailer to a combination but you have doubts about the trailer's brakes, you should use wheel chocks to secure the trailer in place while coupling.

2. When parked on the side of the road, you should:

Use only the rear flashing lights.

Use one set of turn signals.

Use your high beam headlights.

Use your four-way flashers.

Always turn on your four-way emergency flashers if you must park on the side of the road. This is especially important when traveling at night.

3. Accelerating roughly is:

Encouraged at slow speeds.

Encouraged at all speeds.

Discouraged, as it may cause damage to the vehicle.

Discouraged, as it may confuse other drivers.

When accelerating, speed up smoothly and gradually so your vehicle does not jerk. Rough acceleration can cause mechanical damage.

4. When an engine is started:

The brakes should be locked up.

Warning lights should come on and then quickly turn off.

The coolant temperature will decrease.

The hood must be open.

After a vehicle is started, the warning lights and buzzers should go out after a few seconds. If the warning signals do not turn off, there may be something wrong with the vehicle.

5. During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.

2 psi

4 psi

6 psi

It is important to know the maximum air loss rate that is safe for your specific vehicle. A triple combination should have a leakage rate no higher than 6 psi in a minute during an applied leakage test.

6. When driving a bobtail tractor, you should be aware that:

Bobtails stop very easily.

Bobtails cannot drive as fast as tractors with semitrailers.

Bobtails are more difficult to stop than tractors with semitrailers.

Bobtails are illegal in most states.

Bobtail tractors are tractors that are not attached to any semitrailers. When operating a bobtail, you should be aware that stopping can be difficult and that it will take a longer distance to bring the bobtail to a complete stop than it would a tractor attached to a loaded semitrailer.

7. What is sleep debt?

When you fall behind on sleep

When you want to take a nap

Excess sleep

The amount of time it takes to get ready to drive after sleeping

You can build up a "debt" of sleep if you do not sleep for adequate amounts of time. You can only catch up on the time that you "owe" by getting more sleep.

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