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 Washington State Department of Licensing Commercial Driver Guide. 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. If you press the tractor air supply control and your trailer's spring brakes do not release, you should:
Explanation
It is important that all of a vehicle's equipment is in proper working condition before beginning a trip. If a trailer's spring brakes do not release when you push in the tractor air supply control, you should make sure the air line connections are properly attached and sealed.
9. When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:
Explanation
When driving a vehicle with ABS, you should brake in the same manner as you would in a vehicle without ABS.
10. Keeping cargo centered on a rig can:
Explanation
A rollover is more likely if cargo is unevenly loaded in a rig. To help prevent a dangerous rollover, it is important to keep a load as centered on the rig as possible.
11. The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.
Explanation
When making a turn, be sure to steer gently and smoothly. Making a quick turn while pulling trailers is dangerous and can increase the risk of the last trailer rolling over.
12. Pushing in the trailer air supply control will:
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.
13. How much space should be between the upper and lower fifth wheel?
Explanation
Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.
14. When backing up while coupling a trailer, the tractor should be positioned:
Explanation
