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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. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The front trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
The rear trailer is twice as likely to turn over as the tractor.
None of the above.
2. Another name for front-end header boards is:
containerized racks.
headache racks.
cargo stopper.
head belt.
3. Doubles:
are less likely to rollover than straight trucks.
require more reaction time than straight trucks.
are easier to drive than straight trucks.
None of the above.
4. If there is a cargo fire in a van or box trailer, you should:
open the doors, especially if your cargo contains hazardous materials.
enlist the help of bystanders.
keep the doors shut.
keep driving until you reach help.
5. Air brakes use ________ to make the brakes work.
compressed gas cylinders
compressed oil
compressed gases
compressed air
6. Most heavy trucks with manual transmissions require ____ to change gears.
triple clutching
double clutching
single clutching
None of the above.
7. When coupling double trailers, if the second trailer does not have spring brakes, to set the trailer emergency brakes you should:
1. Drive the tractor close to the trailer 2. Connect the emergency line 3. Charge the trailer air tank 4. Disconnect the emergency line.
1. Disconnect the emergency line 2. Drive the tractor close to the trailer 3. Charge the trailer air tank 4. Connect the emergency line.
1. Connect the emergency line 2. Drive the tractor close to the trailer 3. Disconnect the emergency line 4. Charge the trailer air tank.
1. Connect the emergency line 2. Charge the trailer air tank. 3. Drive the tractor close to the trailer 4. Disconnect the emergency line.
8. When more cargo is piled up in a truck, the center of gravity moves:
to the left side of the truck.
to the right side of the truck.
closer to the ground.
higher up from the road.
9. Why should you back toward the driver's side?
You can more easily correct any steering errors.
Using double clutching requires practice.
You can see better and watch the rear of your vehicle by looking out the side window.
All of the above.
10. Exhaust system parts should NOT:
rub against tires.
be loose.
rub against fuel system parts.
All of the above.
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AL CDL Doubles Test

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