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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 Mississippi doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The MS CDL doubles triples test covers the following sections of the Mississippi CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this MS CDL practice test now to prepare for the actual test!
1. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
the parking brake should never used to slow the vehicle.
shifting into neutral may help slow the vehicle.
All of the above.
2. To know how much space you should keep in front of you:
wait until the vehicle ahead of you passes a clear landmark, then count off the seconds until you reach the same spot.
estimate how many seconds it would take you to reach the vehicle ahead.
estimate how many vehicle lengths there are between you and the vehicle ahead.
None of the above.
3. When backing, it is best to:
use only the passenger's side mirror.
use a helper whenever possible.
try to back in the direction of the drift.
back toward the passenger's side when possible.
4. Empty trucks:
require a greaterĀ stopping distance than full trucks.
require a shorter stoppingĀ distance than full trucks.
require the same stoppingĀ distance than full trucks.
None of the above.
5. An item that is 15 feet long placed on a flatbed trailer should have at least:
2 tie-downs.
1 tie-down.
15 tie-downs.
3 tie-downs.
6. ABS helps you:
stop faster.
brake harder.
drive faster.
None of the above.
7. You should always adjust your speed to be able to stop within:
the distance you can see ahead.
50 feet.
30 feet.
the length of your vehicle.
8. Foundation brakes are used:
at each wheel.
only with the rear wheels.
only with the front wheels.
only with the right wheels.
9. Empty trucks:
may have poor traction.
have better traction than fully-loaded trucks.
require shorter stopping distances than fully-loaded trucks.
None of the above.
10. If you hear a loud loud "bang" and the steering feels "heavy", you should:
hold the steering wheel firmly and stay off the brake.
pump the brakes until the vehicle has slowed down.
brake hard and pull off the road.
check your rearview mirrors to see if you have a flat tire.
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MS CDL Doubles Triples Test

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