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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 Alaska doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The AK CDL doubles triples test covers the following sections of the Alaska CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this AK CDL practice test now to prepare for the actual test!
1. How can you tell if a converter dollie has ABS?
There is a yellow lamp on the left side of the dolly.
There is an ABS plaque on the right side of the dolly.
There is a red lamp on the left side of the dolly.
2. Which of the following will off-track the most?
The rear wheels of the tractor.
The front wheels of the last trailer.
The rear wheels of the last trailer.
3. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use a lower gear than would be required to go up the hill.
use the same gear you would use to go up the hill.
shift into neutral and coast.
4. The trailer hand valve should be used:
to test the trailer brakes.
to check that the trailer emergency brakes are on.
to check that the trailer is locked onto the tractor.
5. Do NOT use the parking brakes:
if the brakes are very hot.
when you leave your vehicle.
when you park for less than two hours.
6. If during vehicle inspection a tire is too hot to touch, you should:
immediately decrease air pressure.
remain stopped until the tire cools off.
let air out.
7. When backing, it is best to:
use a helper whenever possible.
use only the passenger's side mirror.
try to back in the direction of the drift.
8. You should do an after-trip inspection:
at least once a week.
once a month.
after each trip.
9. When making a turn you should:
make gestures to get the attention of other drivers.
honk your horn.
signal early.
10. If a trailer does not have spring brakes, to keep the trailer from moving you should:
park on a slight decline.
use the service brakes.
use wheel chocks.
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Doubles Triples AK CDL Test

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