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 Oregon Commercial Driver 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. You must have an air brake endorsement:

To use a vehicle with air brakes.

To drive any truck with a trailer.

To transport hazardous materials.

You must take an air brakes knowledge test to become licensed to operate a vehicle that is equipped with air brakes, including an air over hydraulic braking system.

2. What can rust around the wheel nuts indicate?

That the nuts are loose.

That the nuts are wet.

That the nuts need to be replaced.

That the nuts are the wrong size.

Rust around wheel nuts can indicate that they are loose. If you observe rust, check the tightness of the nuts.

3. If turning to avoid a hazard:

You should brake hard.

You should not brake as it could cause the wheels to lock.

You should turn the wheel very sharply.

You should hold down the brakes until you are past the hazard.

If you are turning to avoid a hazard, do not apply the brakes while you are turning. This could easily lock the wheels and create a skid.

4. Poisonous fumes can enter the cab due to:

A defective exhaust system.

The wrong type of fuel being used.

A lack of oil in the engine.

Under-inflated tires.

Defects in an exhaust system are very dangerous because they can cause poisonous fumes to enter the cab or sleeper berth.

5. When trying to avoid a hazard:

Stopping is always effective.

Swerving may be more effective than stopping.

You may change lanes without looking.

You should drive on the shoulder.

Stopping is not always the most effective response to a hazard. You can usually turn out of the path of a hazard more quickly than you can come to a complete stop. However, swerving is not without its hazards, as it may result in a rollover in a vehicle that is either top-heavy or pulling multiple trailers.

6. If coolant has to be added to a system without a recovery tank, you should:

Keep the vehicle running while adding coolant.

Open the radiator cap quickly.

Not use gloves to touch the radiator cap.

Wait for the engine to cool before adding coolant.

Before adding coolant to a system without a recovery or overflow tank, you must turn the engine off and wait until it cools. Use gloves or a thick cloth to protect your hands. To release the pressure seal, turn the radiator cap slowly to the first stop.

7. When completing pre-trip inspections:

The inspections should be done the same way each time.

Different items should be checked each time.

It is acceptable to check items in a different order each time.

Not every item needs to be inspected each time.

Pre-trip inspections should be conducted in the same way every time. This will reinforce the steps, making it less likely that you will forget to inspect something important.

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