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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. How should you brake if your vehicle loses ABS?
Brake as you always have.
Pump the brake repeatedly
Stay off the Brake
Step on and off the brake pedal several times
2. Texting while operating a commercial motor vehicle is:
acceptable if you are contacting your supervisor.
only allowed at night.
acceptable if you are contacting your dispacther.
3. If your vehicle thumps or vibrates heavily, it may be a sign that:
you need to shift up.
one of the tires has gone flat.
the engine belt is loose.
the brakes have failed.
4. Engine oil pressure should come up to normal within _________ after the engine is started.
two minutes
five minutes
ten minutes
5. Alcohol:
improves muscle coordination.
does not affect judgement.
improves reaction time.
impairs depth perception.
6. Which of the following is NOT true?
ABS will change the way you normally brake.
ABS only comes into play when a wheel would have locked up because of over braking.
ABS won't compensate for bad brakes.
ABS won't compensate for poor brake maintenance.
7. When should you downshift automatic transmissions?
Watch your tachometer, and downshift when your engine reaches the top of the range.
When you want to go faster.
When you start to get drowsy.
When going down steep grades.
8. Placards must be at least _____ inches square.
9. When backing, you should:
back quickly.
avoid using the mirrors.
use a helper if possible.
back and turn toward the right side.
10. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
shifting into neutral may help slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
the parking brake should never used to slow the vehicle.
All of the above.
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Doubles Triples MT CDL Test

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