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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. Air tanks usually hold enough compressed air to allow the brakes to be used _________ even if the compressor stops working.
several times
for 3 days
for one day
for one stop
2. Your vehicle should be equipped with all of the following except:
Warning devices for parked vehicles
Instructions on how to perform a vehicle inspection test
Spare electrical fuses
Fire extinguisher
3. Overloading a vehicle with cargo can have negative effects on all of the following except:
Weight limits
Speed control
4. When connecting to the rear trailer, the trailer height should be:
the same height as the fifth-wheel.
lower than the center of the fifth-wheel.
higher than the center of the fifth-wheel.
None of the above.
5. Which of the following is most likely to roll over?
The rear trailer of a double
The middle trailer of a triple
The front trailer of a double
The rear trailer of a triple
6. Which of the following is NOT correct? Anti-lock brakes:
help drivers avoid wheel lock up.
give drivers more control over the vehicle during braking.
help drivers avoid skids caused by over braking.
require drivers to apply the brakes as hard as they can without locking the wheels.
7. Most heavy-duty vehicles use:
pressure brakes.
hydraulic brakes.
air brakes.
solid brakes.
8. Many large vehicles have convex (curved, "spot, "fisheye") mirrors. Convex mirrors:
make things look smaller and farther away than they really are.
are illegal in most states.
misrepresent reality by showing a larger area than flat mirrors.
None of the above.
9. If you are carrying a heavy load that is slowing you down, you should:
keep the vehicle in third gear.
drive in the left lane.
drive on the shoulder.
drive in the right lane.
10. Which of the following statements about retarders is NOT correct?
Retarders help you avoid skids.
Retarders reduce reduce brake wear.
You should turn the retarder off whenever the road is wet, icy, or snow covered.
Retarders help slow a vehicle, reducing the need for using brakes.
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Doubles Triples UT CDL Test

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