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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. The parking brake:
should be used when driving in bad weather.
should be used when you need to apply the brakes firmly.
should be used whenever you park.
All of the above.
2. An alcohol evaporator:
used to reduce the chance of the front wheels skidding.
protects the air brake system from too much pressure.
is used to reduce the risk of ice in air brake valves and other parts during cold weather.
to hold compressed air.
3. If a vehicle is equipped with ABS, when you start the engine:
the spring brakes will come on.
the wheels will lock up.
the ABS indicator light on the dash should come on and then turn off.
the trailer emergency brakes will come on.
4. Which of the following is a good way to avoid becoming an aggressive driver?
Be realistic about your travel time.
Keep your following distance reasonable.
Avoid talking on your cell phone.
All of the above.
5. When conducting a pre-trip inspection:
the vehicle inspection report should not be reviewed unless your supervisor tells you to do so.
the inspection report should only be reviewed if you will be carrying passengers.
you should review the last vehicle inspection report.
None of the above.
6. During freezing weather, which area is most likely to be slippery after it rains?
Shaded areas.
Roads that look wet.
All of the above.
7. When stopping you should push the brake pedal down:
as hard as you can.
8. When backing a trailer, you should turn the steering wheel to the right to make the trailer go left (or vice versa). Once the trailer starts to turn, you should:
keep backing up.
turn the wheel more  in the direction you want to go.
turn the wheel the other way to follow the trailer.
None of the above.
9. ABS helps you:
lock your wheels.
decrease your average speed.
decrease your overall stopping distance.
keep the wheels from locking up.
10. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
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AL CDL Doubles Triples Test

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