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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Georgia 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 Georgia CDL Manual. Take this practice test now to prepare for the actual GA CDL combination test!
1. In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
100 to 120 psi
50 to 75 psi
10 to 20 psi
20 to 45 psi
2. Which of the following is NOT part of testing the tractor protection valve?
Charging the trailer air brake system.
Shutting off the engine.
Stepping on and off the brake pedal several times to reduce the air pressure in the tanks.
Pulling forward slowly, then applying the trailer brakes.
3. In vehicles with air brakes, the tractor protection valve:
is used to connect the service and emergency air lines from the truck/tractor to the trailer.
carries air, which is controlled by the trailer hand brake or the foot brake.
provides the air pressure used to operate trailer brakes.
keeps air in the tractor or truck brake system.
4. Before leaving your vehicle unattended, you should:
Chock the wheels.
Remove the keys.
Apply the parking brake.
All of the above.
5. If the spring brakes do not release when you push the trailer air supply control, you should:
check the electrical cables.
pump the brakes.
check the air line connections.
rev or lug the engine.
6. In a vehicle with a dual air brake system:
one system supplies air to the trailer.
each system has its own air tanks.
both systems typically operate the regular brakes on the rear axle.
All of the above.
7. The trailer hand valve should be used only:
to test the trailer brakes.
when the trailer is fully loaded.
only in combination with the foot brake.
in driving to prevent skids.
8. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
make sure that the release arm is in the engaged position.
keep an eye on your tires.
go slowly around turns.
keep the vents clear so they work correctly.
9. When backing with a trailer, you should:
make pull-ups to re-position your vehicle as needed.
look at your line of travel before you begin backing.
check your mirrors on both sides frequently.
All of the above.
10. You should test the coupling by:
applying the parking brakes so the rig will not move.
locking the pintle hook.
pulling against the pin of the second semitrailer.
disconnect the safety chains.
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CDL Combination Test (GA)

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