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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. A bridge formula permits:
more maximum axle weight for axles that are far apart.
less maximum axle weight for axles that are far apart.
more maximum axle weight for axles that are closer together.
less maximum axle weight for axles that are close together.
2. When stopping you should push the brake pedal down:
as hard as you can.
3. When the wheels of a trailer lock up, which of the following is most likely to occur?
The trailer will the trailer has overturn.
The rig will stay in a straight line but slide sideways.
The trailer will tend to push the towing vehicle sideways (tractor jackknife).
The trailer will tend to swing around (trailer jackknife).
4. Brake lag is:
the distance your vehicle will travel, in ideal conditions, while you are braking.
the amount of air pressure required to stop the vehicle.
the time required for the air brakes to work after the brake pedal is pushed.
the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
5. Your mirrors should be adjusted so that:
no part of the vehicle is visible in the mirror.
a part of the vehicle is visible in the mirror.
the rear of the vehicle is visible in the mirror.
more than half of the mirror shows the vehicle.
6. When a tire fails, you should:
push the brake pedal down gradually.
stay off the brake.
brake in a way that will keep your vehicle in a straight line.
apply the brakes as hard as you can without locking the wheels.
7. Which of the following is a reason to cover cargo?
To protect people from spilled cargo
To contain a spill
To protect the cargo from weather
All of the above.
8. ABS helps you:
drive faster.
brake harder.
stop faster.
None of the above.
9. When should you turn the retarder off?
when the cargo is heavy.
when the cargo is prone to shifting.
when your vehicle has a high center of gravity.
when the road is slippery.
10. When parked on the side of the road, you should:
use the 4-way emergency flashers.
turn off all lights.
activate the right turn signal.
flash your brake lights.
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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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