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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. Under-loaded front axles can:
make the steering axle weight too light to steer safely.
cause poor traction.
cause the drive wheels to spin easily.
All of the above.
2. An Anti-lock Braking System:
increases the distamce required to stop on slippery surfaces.
keeps your wheels from locking when you brake hard.
lets you brake faster.
increases a vehicle's stopping power.
3. Air brakes:
can improve fuel efficiency.
are an effective way to stop large and heavy vehicles.
are prohibited on larger vehicles.
should be used only when driving on wet roads.
4. If your trailer starts to skid, you should:
accelerate slightly.
release the brakes to get traction back.
keep the rear of your vehicle close to the curb.
use the trailer hand brake (if you have one) to straighten out the rig.
5. Emergency brakes must be must be held on by:
air pressure.
mechanical force.
the locking mechanism.
6. If the safety relief valve in the air brake system releases air:
this will supply more power to the brakes.
the valve is fully operational.
something is wrong.
this will supply more power to the drive wheels.
7. When backing with a trailer, you should:
check your mirrors on both sides frequently.
look at your line of travel before you begin backing.
make pull-ups to re-position your vehicle as needed.
All of the above.
8. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:
connect the electrical cord and check the air lines.
supply air to the trailer system and lock the trailer brakes.
begin raising the landing gear.
remove the wheel chocks.
9. When connecting the glad hands, you should press the two seals together with the couplers at a ______ angle to each other.
180 degree
45 degree
90 degree
30 degree
10. If a drawbridge does not have a signal light or traffic control attendant, you should:
drive through the drawbridge with caution.
stop at least 5 feet before the draw of the bridge.
get through the drawbridge as quickly as possible.
stop and look to make sure the draw is completely closed before crossing.
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AL CDL Combination Test

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