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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 Massachusetts doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MA CDL doubles triples test covers the following sections of the Massachusetts CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MA CDL practice test now to prepare for the actual test!
1. Your vehicle should be equipped with all of the following except:
Warning devices for parked vehicles
Instructions on how to perform a vehicle inspection test
Spare electrical fuses
Fire extinguisher
2. If you must stop on a one-way or divided highway, place your warning devices:
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 100 feet, and 200 feet toward the approaching traffic.
50 feet, 100 feet, and 150 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
3. If your trailer starts to skid, you should:
steer in the opposite direction.
pump the brakes.
lock the brakes.
release the brakes.
4. Placards are:
signs put inside a vehicle used to warn others of hazardous materials.
signs placed on a vehicle to identify the hazard class of the cargo.
a type of safety equipment.
devices placed below a vehicle to improve traction.
5. Which of the following is NOT a reason for hydraulic brake failure?
Brake fade on long hills
Stab braking
Loss of hydraulic pressure
All of the above.
6. Warnings on low bridges or underpasses:
must be posted.
are always posted.
are often posted, but sometimes they are not.
None of the above.
7. Which of the the following statements about fatigue is true?
Fatigue may cause you to not see and react to hazards.
Fatigued driving is one of the leading causes of accidents.
Fatigue impairs your vision and judgment.
All of the above.
8. How does ABS help you?
ABS replaces your normal brakes and helps you  to stop faster.
ABS helps you avoid wheel lock up and maintain control when you brake hard on slippery surfaces.
ABS always shortens your stopping distance.
ABS makes stab braking more effective.
9. When you back under a trailer:
make sure the trailer brakes are locked.
use lowest reverse gear.
back the tractor slowly.
All of the above.
10. Headache racks:
protect you from being hit by your cargo.
help you keep weights within legal limits.
can blind other drivers.
None of the above.
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MA CDL Doubles Triples Test

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