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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Alabama 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 Alabama CDL Manual. Take this practice test now to prepare for the actual AL CDL combination test!
1. You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
fully lowered.
fully raised.
raised slightly off the ground.
None of the above.
2. The best way to test the trailer service brakes is to:
pull forward quickly, then apply the trailer brakes with your hand control.
put the handbrake on when there are no vehicles around you.
accelerate to the maximum possible speed, then apply the trailer brakes fully.
None of the above.
3. The use of brakes on a steep downgrade is:
dangerous, and should be avoided at all costs.
much more effective than the engine braking effect.
a supplement to the braking effect of the engine.
the main braking factor.
4. When you inspect the coupling, make sure there is ______ between the upper and lower fifth wheel.
enough space
about 1 inch
no space
about 1/2 inch
5. 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:
ease into the other lane slowly so the other car can get out of the way.
assume the car left the roadway and change lanes as normal.
wait until you are sure the car isn't in your blind spot.
None of the above.
6. The emergency air line:
controls the emergency brakes on combination vehicles.
causes the tractor protection valve to close when the emergency line loses pressure.
supplies air to the trailer air tanks.
All of the above.
7. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.
mounting bolts
safety chains
electric connectors
locking pins
8. To unlock the fifth wheel, pull the release handle to the _______ position.
9. Empty trucks:
may have poor traction.
require shorter stopping distances than fully-loaded trucks.
have better traction than fully-loaded trucks.
None of the above.
10. When going down grades, you should:
shift up.
downshift to a lower gear.
rely solely on engine braking to reduce your speed.
put the transmission in Neutral.
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AL CDL Combination Test

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