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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. With an engine fire, you should:
open the hood as soon as possible.
not shoot foam from the vehicle’s underside.
turn the engine off as soon as possible.
All of the above.
2. Glad hands are:
warning devices.
securement devices.
coupling devices.
electronic devices.
3. Blocking is used to:
protect the cargo from weather.
keep the cargo from sliding.
protect people from spilled cargo.
All of the above.
4. A low air pressure warning signal:
is optional on vehicles with air brakes.
is required on vehicles with air brakes.
is required on all vehicles without air brakes.
None of the above.
5. To know if your vehicle is equipped with ABS, look for:
the ABS logo on the steering wheel.
an ABS placard.
a yellow ABS malfunction lamps on the instrument panel.
the ABS shipping paper.
6. Dual tires:
should come in contact with each other whenever possible.
are dangerous.
should always come in contact with each other.
should not come in contact with each other.
7. Older trailers do not have spring brakes. If the air supply leaks away:
there will be no emergency brakes.
the ABS won't work properly.
the trailer will stop normally.
All of the above.
8. Air brakes use ________ to make the brakes work.
compressed oil
compressed gas cylinders
compressed gases
compressed air
9. If you are feeling sleepy, you should:
pull off the road and rest or take a nap.
slow down and drive on the shoulder of the road.
increase your speed to get to the destination quicker.
None of the above.
10. 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.
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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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