Instructions

Combination

All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Wyoming Driver License Manual for Commercial & Heavy Vehicles. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.

Number of Question 20

Passing Score 16

1. If you are backing and become unsure about your path of travel, you should:

Continue backing.

Stop and get out to look.

Continue backing, but more slowly than before.

If you are unsure of your path while you are driving in reverse, you should stop, exit the vehicle, and recheck your path of travel.

2. Pushing in the trailer air supply control will:

Supply the trailer with air.

Deactivate the air brakes.

Prevent the vehicle from skidding.

Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.

3. What is the Johnson bar?

A hand valve that works the trailer brakes

A valve that indicates the fuel level

A valve that limits the amount of cargo

The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid.

4. The trailer hand valve should be used:

To accelerate in rural areas.

Only to test the trailer brakes.

Together with the brake pedal.

On slippery surfaces.

5. How much space should be between the upper and lower fifth wheel?

About five inches of space

A maximum of two inches of space

No space

Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.

6. Push in the trailer air supply control to:

Activate the emergency brakes.

Deactivate the air brakes.

Sound the horn.

Supply the trailer with air.

Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.

7. An air supply control in its "emergency" position will:

Turn on the air supply.

Apply the trailer emergency brakes.

Prevent a skid.

Accelerate the vehicle.

Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "emergency" position, the air supply will be stopped and the trailer emergency brakes will be applied.

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