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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 must drive slowly, how should you alert following drivers?
Flash your brake lights
Use your emergency flashers if it is legal
Turn on your taillights
Help them out by signaling when it is safe to pass
2. With an engine fire, you should:
open the hood as soon as possible.
turn the engine off as soon as possible.
not shoot foam from the vehicle’s underside.
All of the above.
3. Containerized loads are used:
when transporting explosives.
when the cargo exceeds the weight limit.
when the cargo has been or will be carried by rail or ship.
when transporting liquids.
4. Which of the following is NOT a reason for hydraulic brake failure?
Loss of hydraulic pressure
Stab braking
Brake fade on long hills
All of the above.
5. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
The front trailer is twice as likely to turn over as the tractor.
The rear trailer is twice as likely to turn over as the tractor.
All trailers are equally likely to turn over.
None of the above.
6. Texting while driving a CMV is:
acceptable if the message less than 140 characters.
safer than talking on the phone.
acceptable if the message work-related.
7. Air brakes:
can improve fuel efficiency.
are an effective way to stop large and heavy vehicles.
should be used only when driving on wet roads.
are prohibited on larger vehicles.
8. When driving in very hot weather, you may have to:
increase your speed until the tires cool off.
watch out for black ice.
reduce your speed to prevent overheating.
decrease your following distance.
9. When going down a steep downgrade, you should primarily brake using:
the emergency brake.
the service brakes.
the braking effect of the engine.
the parking brake.
10. When the wheels of a trailer lock up:
the vehicle will gradually come to a complete stop.
the trailer will tend to swing around.
ABS will increase stopping power.
All of the above.
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MS CDL Doubles Triples 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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