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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 Utah doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The UT CDL doubles triples test covers the following sections of the Utah CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this UT CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Utah.
1. When coupling, you should:
be aware that wrong coupling and uncoupling can be very dangerous.
make sure the sliding fifth-wheel is locked.
make sure the trailer wheels are not chocked.
make sure the trailer kingpin is bent.
2. The tractor protection valve:
controls the emergency brakes on combination vehicles.
works the trailer brakes.
supplies air to the trailer air tanks.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
3. How can you tell if a converter dollie has ABS?
There is an ABS plaque on the right side of the dolly.
There is an ABS system on the right side of the dolly.
There is a yellow lamp on the left side of the dolly.
There is a red lamp on the left side of the dolly.
4. What is the most important reason to inspect your vehicle?
Vehicle inspection is required by federal and state laws.
Achieving the best gas mileage.
Saving money by preventing costly repairs.
Your safety and that of other road users.
5. Which of the following is a reason to cover cargo?
To contain a spill
To protect the cargo from weather
To protect people from spilled cargo
All of the above.
6. Regardless of its size, cargo should have at least ___ tie-downs.
7. Who is responsible for inspecting the cargo?
The shipper
The driver
The motor carrier
The person who loaded and secured the cargo
8. If you will be transporting hazardous materials that require placards, you must:
obtain a hazardous materials endorsement.
transport the materials at night only.
obtain a special transit permit.
ask permission of the local transportation agency.
9. The trailer hand valve should:
never be used for parking.
never be used to test the trailer brakes.
be used in driving.
All of the above.
10. 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 vehicle lengths there are between you and the vehicle ahead.
estimate how many seconds it would take you to reach the vehicle ahead.
None of the above.
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UT CDL Doubles Triples Test

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