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 Kansas Commercial Driver’s Manual. Questions come from chapters covering: Driving Safely, 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. The air compressor governor controls:

When the air compressor pumps air into the air storage tanks.

How fast air is pumped into the air storage tanks.

The temperature of air pumped into the air storage tanks.

The speed of the vehicle.

In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.

2. When driving with covered cargo, a cover that flaps:

Is acceptable.

Allows air to keep the cargo cool.

Can tear loose.

Can attract birds.

Cargo covers should not flap in the wind. They could tear loose, not only uncovering the cargo but also blocking the views of drivers.

3. 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.

4. What does ABS do?

Prevent wheel lockup

Prevent the air compressor from overheating

Prevent the front brakes from being used on ice

Prevent the brakes from being used if downshifting would be more effective

The purpose of an Anti-Lock Braking System (ABS) is to prevent wheels from locking up during hard applications of the brakes, especially on slippery surfaces.

5. Bridges usually:

Freeze, but only once the temperature drops significantly below 32 degrees Fahrenheit.

Freeze after other road surfaces freeze.

Freeze before other road surfaces.

Have heaters to prevent them from freezing.

Bridges usually freeze before the rest of the road. You should be especially careful when crossing bridges if the temperature is near the freezing point.

6. On a leaf spring, the leaves:

May be broken.

Are not required.

Should not be broken.

Should shift.

When inspecting a vehicle's suspension, you should look for broken or missing leaves in the leaf springs. Any defect of this kind is dangerous. If one-fourth or more of the leaves are missing from any leaf spring, the vehicle must be put out-of-service.

7. When connecting a converter dolly to the rear trailer, the trailer height should be:

Higher than the center height of the fifth wheel.

Lower than the center height of the fifth wheel.

The same height as the fifth wheel.

About shoulder height.

When connecting a converter dolly to the rear trailer, make sure the trailer height is correct. It should be slightly lower than the center of the fifth wheel so that the trailer is raised slightly when the dolly is pushed under.

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