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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 Montana doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MT CDL doubles triples test covers the following sections of the Montana CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MT CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Montana.
1. An item that is 15 feet long placed on a flatbed trailer should have at least:
2 tie-downs.
15 tie-downs.
3 tie-downs.
1 tie-down.
2. When driving a truck with more than 1 trailer, drivers should:
allow more following distance.
look far ahead so they can slow down or change lanes when necessary.
be especially careful in adverse conditions.
All of the above.
3. When the spring brakes are on, you should:
pump the brakes.
exceed the posted speed limit.
press the accelerator.
not push the brake pedal down.
4. Which of these statements about brakes is true?
Brake fade does not result from excessive heat.
To stop, the brake shoes and linings are pushed against the outside of the drum.
The lighter the vehicle, the more heat the brakes absorb to stop it.
None of the above.
5. _________ rigs are much more likely to roll over in an accident than _________ rigs.
Fully loaded ; empty
Empty ; fully loaded
Fully loaded ; overloaded
Empty ; overloaded
6. When driving on slippery roads, you should NOT:
try to anticipate stops early.
go slowly.
use the engine brake.
watch far enough ahead to keep a steady speed.
7. You should flash your brake lights to warn drivers behind you when:
you see you'll need to slow down.
you see a bus stops in the roadway ahead to unload passengers.
you see a hazard that will require slowing down.
All of the above.
8. The tractor protection valve:
keeps air from going out if the air compressor develops a leak.
prevents the trailer from being accidentally released.
keeps your wheels from locking up when you brake hard.
keeps air in the brake system should the trailer develop a bad leak.
9. On front tires, tread should be at least:
2/32 inch
1/16 inch
4/32 inch
4/16 inch
10. If a load is 50 feet long, the minimum number of tie-downs required is:
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MT Doubles Triples CDL Test

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