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
Passing Score
8. When coupling:
Explanation
Incorrect coupling and uncoupling of combination vehicles can have extremely dangerous consequences.
9. What is a bobtail tractor?
Explanation
Tractors without semi-trailers are referred to as "bobtail tractors." Bobtail tractors are difficult to operate and drivers must exercise caution.
10. Push in the trailer air supply control to:
Explanation
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.
11. If a load is placed on one side of a trailer, the trailer:
Explanation
Positioning the weight of a load on one side of a trailer may cause the trailer to lean to that side, increasing the risk of a rollover during turns and lane changes.
12. How many air lines does a combination vehicle have?
Explanation
Every combination vehicle has two air lines: the service line and the emergency line.
13. If a trailer begins to skid, the driver should:
Explanation
If your trailer starts to skid while you are braking, you should release the brakes and allow them to begin to regain traction. Once its wheels have regained their grip on the road, the trailer will begin to straighten out and follow the tractor.
14. If a trailer begins to jackknife, you should not:
Explanation
