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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. If you are caught in strong winds, you should:
keep a strong grip on the steering wheel and slow down or pull off the roadway.
speed up while keeping a strong grip on the steering wheel.
immediately take your foot off the accelerator.
None of the above.
2. Air tank drains:
are used to remove water and oil from the air tanks.
should not be used in wet weather.
protect the tanks and the rest of the system from too much pressure.
are used to move air to the brakes.
3. Pre-trip inspections are:
required only for trips of more than 100 miles.
required by law
required only for trips of more than 50 miles.
4. The ABS malfunction lamp on the instrument panel is:
5. Which of the following vehicles is most likely to turn over?
3 axle tractor semitrailer
5 axle tractor semitrailer
Triple trailer
65 ft. conventional double
6. What can cause poor traction?
Too little weight on the driving axles.
Too much weight on the steering axle.
Overloading the truck.
All of the above.
7. To prevent rollover, you should do all of the following except:
avoid quick lane changes.
put the lightest parts of the cargo under the heaviest parts.
keep the load centered on your rig.
drive slowly around turns.
8. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
9. 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.
50 feet, 100 feet, and 150 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10. Before driving a vehicle with a dual brake brake system, the driver should:
wait at least 10 minutes before driving.
allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems.
wait at least 5 minutes before driving.
pump the brake pedal 10 times to build pressure.
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Doubles Triples MS CDL Test

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