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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. If you have to drive off the road, you should:
brake as hard as you can to maintain control.
keep one set of wheels on the pavement, if possible.
fully apply the brakes until your speed has dropped to about 20 mph.
2. Right after it starts to rain, the road is very slippery. Why?
Because rain is very slippery.
Because black ice may form on the road.
Because the water mixes with oil left on the road by vehicles.
3. You must have at least _____ inch tread depth in every major groove on front tires.
4. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
You may not notice a major leak in the service line until you try to put the brakes on.
5. When driving with more than one trailer, the _______ trailer should be the first one behind the tractor.
6. How should you apply the brakes when going down a steep downgrade?
Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
Apply the brakes when you reach the bottom of the downgrade.
Apply the brakes as hard as you can without locking the wheels.
7. When driving a truck with more than 1 trailer, drivers should:
be especially careful in adverse conditions.
allow more following distance.
All of the above.
8. The posted speed for a curve that may be safe for a straight truck:
could be too fast for a double or triple.
is likely to be safe for a double or triple.
can be ignored when driving a double or triple.
9. Warnings on low bridges or underpasses:
are always posted.
are often posted, but sometimes they are not.
must be posted.
10. When inspecting the coupling, how much space should there be between the upper and the lower fifth-wheel?
It depends on the trailer
½ inch
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AK CDL Doubles Triples Test

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