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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 Texas doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The TX CDL doubles triples test covers the following sections of the Texas CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this TX CDL practice test now to prepare for the actual test!
1. On any upgrade, _________ – the more you will have to use lower gears to climb hills or mountains.
the longer the grade
the heavier the load
the steeper the grade
All of the above.
2. Which of the following road surfaces freezes first?
Open roads
3. When a combination vehicle goes around a corner:
the driver must keep the rear of your vehicle far away from the curb.
the front and rear wheels follow a different path.
the rear wheels of the trailer will never off-track.
All of the above.
4. Glad hands are:
warning devices.
coupling devices.
electronic devices.
securement devices.
5. You should always try to back toward the driver's side because:
you can more easily correct any steering errors.
you can watch the rear of your vehicle out the side window.
backing toward the left side is more dangerous.
None of the above.
6. At dawn, dusk, in rain or snow, to make yourself easier to see you should:
use the parking lights.
use the high beams.
use the emergency flashers.
use the low beams.
7. Retarders:
help prevent accidents by applying extra braking power to the non-drive wheels.
help slow a vehicle and reduce brake wear.
apply their braking power whenever you push on the accelerator.
All of the above.
8. Foundation brakes are used:
only with the front wheels.
only with the right wheels.
only with the rear wheels.
at each wheel.
9. You should flash your brake lights to warn drivers behind you when:
you see a hazard that will require slowing down.
you see a bus stops in the roadway ahead to unload passengers.
you see you'll need to slow down.
All of the above.
10. If there is a cargo fire in a van or box trailer, you should:
enlist the help of bystanders.
keep the doors shut.
keep driving until you reach help.
open the doors, especially if your cargo contains hazardous materials.
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TX Doubles Triples CDL Test

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