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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. On any upgrade, gravity:
doesn't affect your speed.
slows you down.
doubles your speed.
speed you up.
2. If driving a heavy vehicle, you should:
try to pass other vehicles going uphill.
stay in the right lane.
stay in the left lane.
avoid braking.
3. Combination vehicles have __ air lines.
4. Which of the following statements is true?
Under-inflated tires will NOT cause a vehicle fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
Poor cargo ventilation is a common cause of fire.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.
5. To reduce the chance of rollover, you should:
place the cargo as high as possible inside the trailer.
put the lightest parts of the cargo under the heaviest parts.
distributed the cargo as low as possible inside the trailer.
None of the above.
6. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
keep the clutch slipping while slowly accelerating.
use the parking brake to hold the vehicle until the clutch engages.
partly engage the clutch before you take your right foot off the brake.
shift down to a speed that you can control without using the brakes.
7. What should you do if you doubt you have safe space to pass under a low bridge?
If no warnings are posted, assume there is enough clearance under the bridge and proceed slowly.
Go slowly, and take another route if you are not sure you can make it.
Assume that the height posted at the bridges is correct.
Increase the weight of your vehicle to clearing under the bridge.
8. If your vehicle is hydroplaning, you should:
apply the brakes.
stay off the brake.
speed up.
put the vehicle in reverse.
9. Too much weight on the steering axle can cause:
poor traction.
hard steering and damage to the steering axle and tires.
better handling.
None of the above.
10. When you push in the red trailer air supply knob, this will:
disconnect the air lines from the trailer.
supply air to the emergency supply lines.
open the emergency line shut-off valve at the rear of the last trailer.
disconnect the electrical connector.
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UT Doubles Triples Test

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