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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Alabama doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The AL CDL doubles triples test covers the following sections of the Alabama CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this AL CDL practice test now to prepare for the actual test!
1. With brake drums, if brakes become too hot:
your ABS will malfunction.
The brakes may stop working
the brakes will supply too much power to the drive wheels.
the air compressor will kick on to cool the brakes.
2. Headache racks:
can blind other drivers.
protect you from being hit by your cargo.
help you keep weights within legal limits.
None of the above.
3. If a load is placed on one side of the trailer:
your brakes won't work.
making turns may be easier.
a rollover is more likely.
the steering axle weight will be too light to steer safely.
4. If you must make an emergency stop, you should:
brake in a way that will keep your vehicle in a straight line.
apply the brakes as hard as you can to lock them.
use the hand brake before the brake pedal.
None of the above.
5. If coolant has to be added to a system without a recovery tank, you should:
keep the engine running while adding coolant.
never use thick cloth to touch the radiator cap.
turn the radiator cap quickly to the first stop.
wait until the engine has cooled before adding coolant.
6. With an engine fire, you should NOT:
shoot foam from the vehicle’s underside.
open the hood.
turn the engine off as soon as possible.
None of the above.
7. If your ABS malfunctions:
the service brake will not work.
the parking brakes will not work.
you still have normal brake functions.
you should immediately come to a complete stop.
8. Most heavy duty vehicles use ___ air brake systems for safety.
9. Before driving a vehicle with a dual brake brake system, the driver should:
wait at least 10 minutes before driving.
wait at least 5 minutes before driving.
pump the brake pedal 10 times to build pressure.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
10. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the trailer supply valve will stay open.
the engine will shut down.
the trailer emergency brakes will come on.
the tractor will lose all air pressure.
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Doubles Triples AL CDL Test

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