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 North Dakota Commercial Driver Guide. Questions come from chapters covering: Driving Safely, Transporting Cargo 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. Belts in the engine compartment should be:

Frayed.

Tight.

Greasy.

Easy to slide off.

When inspecting your vehicle's engine, check the belts for tightness and excessive wear. The amount of "give" that is safe for each belt in a given engine will vary, so learn what is appropriate for your vehicle.

2. Too little weight on a steering axle can result in:

Poor traction.

Increased visibility.

Longer stopping distances.

Improved gas mileage.

The weight of cargo in a vehicle needs to be balanced appropriately so that it does not interfere with the vehicle's safe handling. For example, if cargo is placed too far to the rear of a vehicle, the front axle will be under-weighted and the front wheels may not have enough traction for the driver to steer safely.

3. A vehicle stopped at a green light may indicate that the driver:

Is impaired.

Is colorblind.

Does not know the rules of the road.

Is very patient.

It is important to observe other drivers' actions and identify clues that a person could be driving impaired. Drivers who have had too much to drink, are sleepy, are on drugs, or are ill can present hazards to other drivers. One sign that a driver may be impaired is that they stop in inappropriate places, such as at green traffic lights.

4. What is the Gross Vehicle Weight Rating (GVWR)?

The maximum permitted total weight of a vehicle and its cargo

The minimum permitted weight of a trailer

The maximum permitted weight of a trailer and its contents

The maximum permitted weight of only a tractor

The Gross Vehicle Weight (GVW) is the total weight of a single vehicle plus its load. The Gross Vehicle Weight Rating (GVWR) is the maximum combined weight of a vehicle and its cargo that is permitted and specified by the manufacturer.

5. The emergency air line:

Is controlled by the foot brake.

Is connected to the relay valves.

Supplies air to the trailer air tanks.

Prevents skids.

The emergency air line (also known as the supply line) has two functions. The first is to supply air to the trailer air tanks on a combination vehicle, and the second is to control the emergency brakes.

6. When driving down a steep grade:

You should ride your brakes all the way down.

Shift into a higher gear as a way to slow down your vehicle.

Shift into lower gears as a way to slow down your vehicle.

The truck should be put in neutral as a way to slow down your vehicle.

When driving down a steep grade, you should rely primarily on the braking effect of the engine to slow down. To prevent overheating, use your brakes only as a supplement to this slowing technique.

7. What can happen if parking brakes are used in very wet weather with temperatures 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 become too smooth to be used.

Parking brakes should not be used in very wet weather when temperatures are below freezing. The brakes could become frozen in place, making it impossible to move the vehicle.

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