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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Arizona CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Arizona CDL Manual. Take this practice test now to prepare for the actual AZ CDL combination test!
1. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:
keep from rolling back.
hold compressed air.
prevent movement of cargo.
2. When checking the lights before driving:
you should turn off the engine.
make sure the parking brake is not set.
you should check them from inside the vehicle.
3. You are coupling a semi-trailer to your tractor but have not yet backed under. The trailer is at the right height when:
the end of the kingpin is even with the top of the fifth wheel.
it will be raised slightly when the tractor is backed under it.
the locking jaws are around the head of the kingpin.
4. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
wait until you are sure the car isn't in your blind spot.
assume the car left the roadway and change lanes as normal.
ease into the other lane slowly so the other car can get out of the way.
5. When backing a trailer on a curved path you should back towards:
either side.
the driver's side.
neither side (back up straight).
6. When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
Using the trailer handbrake to provide air to the service line.
Pulling tractor forward until the fifth-wheel comes out from under the trailer.
Going to the rear of the rig.
7. Inspecting the fifth-wheel does NOT include:
backing until the fifth-wheel just touches the trailer.
checking for missing or damaged parts.
checking that there are no cracks in the frame.
8. Inspecting the fifth-wheel does NOT include:
checking the area around the vehicle.
ensuring the fifth wheel is in the proper position for coupling.
making sure that the fifth-wheel plate is greased as required.
9. If you let air out of hot tires:
air pressure will increases, causing the tires to blow out.
as the tire cools, the air pressure will be too low.
the tires will cool off much sooner.
10. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep an eye on your tires.
go slowly around turns.
keep the vents clear so they work correctly.
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AZ CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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