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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. If your brakes fail on a steep mountain downgrade, you should:
use an escape ramp if it is available.
go right if the shoulder is clear.
leave the road immediately.
change lanes after making sure there is enough room.
2. 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.
immediately take your foot off the accelerator.
speed up while keeping a strong grip on the steering wheel.
None of the above.
3. To make the brakes work, air brakes use:
carbon monoxide.
hydraulic air.
compressed air.
4. Which of the following is a good way to avoid becoming an aggressive driver?
Keep your following distance reasonable.
Be realistic about your travel time.
Avoid talking on your cell phone.
All of the above.
5. Which of the following statements about drivers fixing an engine or changing a tire is true?
They often do not pay attention to roadway traffic.
They usually pay attention to the danger roadway traffic is to them.
They must park within 5 feet of the roadway.
Roadway traffic is not a danger to them.
6. To prevent rollover, you should:
drive on the shoulder of the road when possible.
drive in the left lane.
drive slowly around corners.
turn the engine off while turning.
7. Which of these describes the proper braking technique when driving on a long and steep downgrade?
Apply the brakes until your speed has been reduced to 5 mph, then release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Apply the brakes. When your speed has been reduced to 5 mph below your safe speed, release the brakes. When your speed has increased to your safe speed, repeat the previous steps.
Release the brakes until your speed is 5 mph above your safe speed, then apply the brakes. When your speed has decreased to your safe speed, repeat the previous steps.
All of the above.
8. Hydroplaning:
can occur at speeds as low as 30 mph.
can occur only if there is a lot of water on the road.
is less likely if tire pressure is low.
can occur at speeds as low as 10 mph, if there is a lot of water.
9. When the wheels of a trailer lock up:
the trailer will tend to swing around.
ABS will increase stopping power.
the vehicle will gradually come to a complete stop.
All of the above.
10. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
a thumping sound.
a mechanical vibration.
the service line valve close.
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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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