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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. In a dual air brake system, if one air system is very low on pressure:
either the front or rear brakes will not be operating fully.
you should pump the brakes to restore pressure.
you should drive and brake as you always have.
2. The weight of a truck:
has an impact on stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
has no effect on stopping distance.
3. Excessive use of the service brakes results in overheating. Too much heat can:
cause the brakes to grab.
make the brakes stop working.
cause the brakes apply unevenly.
4. Pre-trip inspections are:
required by law
required only for trips of more than 50 miles.
5. When driving in hot weather, drivers should inspect tires:
every 2 hours or every 100 miles.
every 3 hours or every 75 miles.
every 4 hours or every 200 miles.
6. To test your parking brake, do the following:
Set the parking brake while going downhill.
Set the parking brake, and gently pull against it in a low gear.
Speed up to 5 mph, then set the parking brake.
7. If coolant has to be added to a system without a recovery tank, you should:
keep the engine running while adding coolant.
turn the radiator cap quickly to the first stop.
wait until the engine has cooled before adding coolant.
8. The heavier the vehicle:
the less work the brakes must do to stop it.
the higher the center of gravity will be.
the more work the brakes must do to stop it.
9. You are more at risk of being fatigued:
when stopping periodically during long trips.
after getting more than 8 hours of sleep.
when driving alone.
10. Too little weight on the driving axles can cause:
longer stopping distances.
mechanical damage.
poor traction.
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AK Doubles Triples Test

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