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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. When approaching a double railroad track, you should:
remember that trains may be more frequent.
remember that a train on one track may hide a train on the other track.
expect to hear a train when it's approaching.
rely upon the presence of warning signals.
2. You must have at least _____ inch tread depth in every major groove on front tires.
3. If you go twice as fast, your stopping distance will increase by:
four times.
two times.
eight times.
ten times.
4. Which of the following is not a braking system on a truck?
Steering brake
Service brake
Emergency brake
Parking brake
5. The best way to recognize that your trailer has started to skid is:
by seeing it in your mirrors.
by feeling the brakes come on.
by opening the window and feeling the front of the mirror.
by recognizing tire failure.
6. Retarders:
help slow a vehicle and reduce brake wear.
help prevent accidents by applying extra braking power to the non-drive wheels.
apply their braking power whenever you push on the accelerator.
All of the above.
7. Rough acceleration can cause:
damage electrical and brake lines.
tire damage.
mechanical damage.
All of the above.
8. After an accident, an improper use of flares could cause:
a fireĀ if spilled fuel is on the ground.
air pressure to build from 50 to 100 psi within 2 minutes.
the vehicle to slide back and forth.
the springs to put on the brakes.
9. When driving, you should check mirrors regularly to know where other vehicles are around you. Remember that:
there are blind spots that your mirrors cannot show you.
you should check your after the start of any trip to make sure they are properly adjusted.
every registered motor vehicle must have at least one mirror.
convex mirrors make things look larger and closer than they really are.
10. If you must stop on a one-way or divided highway, place your warning devices:
10 feet, 100 feet, and 200 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
50 feet, 100 feet, and 150 feet toward the approaching traffic.
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MT CDL Doubles Test

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