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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 you must drive slowly, how should you alert following drivers?
Help them out by signaling when it is safe to pass
Turn on your taillights
Flash your brake lights
Use your emergency flashers if it is legal
2. When driving a 50-foot truck at 40 mph, your minimum following distance should be:
4 seconds
8 seconds
5 seconds
6 seconds
3. An ABS system:
requires a change in the way you brake.
decreases your stopping distance.
helps increase a vehicle's stopping power.
is a safety anti-skid braking system.
4. At dawn, dusk, in rain or snow, to make yourself easier to see you should:
use the emergency flashers.
use the low beams.
use the high beams.
use the parking lights.
5. The minimum amount of tread for rear tires is:
2/32 of an inch
1/8 of an inch
1/32 of an inch
1/64 of an inch
6. Why should you cover your cargo?
To protect people from spilled cargo.
Because spill protection is a safety requirement in many states.
To protect the cargo from weather.
All of the above.
7. Foundation brakes are used:
at each wheel.
only with the front wheels.
only with the right wheels.
only with the rear wheels.
8. You should always try to back toward the driver's side because:
you can more easily correct any steering errors.
backing toward the left side is more dangerous.
you can watch the rear of your vehicle out the side window.
None of the above.
9. If you unlock the pintle hook with the dolly still under the rear trailer:
the brakes could be damaged by the combined forces of the springs and the air pressure.
the dolly tow bar may fly up.
steam and boiling water can spray under pressure.
your vehicle might roll away.
10. When driving in very hot weather, you may have to:
decrease your following distance.
increase your speed until the tires cool off.
watch out for black ice.
reduce your speed to prevent overheating.
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UT Doubles Triples CDL Test

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