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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. Because of the "crack-the-whip" effect, doubles and triples:
are more likely to run out of gas than other combination vehicles.
are more likely to turn over than other combination vehicles.
can go much faster than other combination vehicles.
are much slower than other combination vehicles.
2. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
shifting into neutral may help slow the vehicle.
the parking brake should never used to slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
All of the above.
3. If driving a heavy vehicle, you should:
stay in the left lane.
try to pass other vehicles going uphill.
avoid braking.
stay in the right lane.
4. Which of the following is NOT a reason for hydraulic brake failure?
Loss of hydraulic pressure
Stab braking
Brake fade on long hills
All of the above.
5. Tire load is defined as:
the weight transmitted to the ground by 1 tire.
the maximum safe weight a tire can carry at a specified pressure.
the minimum safe weight a tire can carry at a specified pressure.
the minimum tire pressure.
6. When parking a trailer without spring brakes, it is very important for safety that you use wheel chocks. Why?
You may not notice a major leak in the service line until you try to put the brakes on.
if you don't use wheel chocks, supply air will be sent to the service line instead of going to charge the trailer air tanks.
The air could leak out of the trailer air tank, releasing its emergency brakes.
None of the above.
7. 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.
8. If an aggressive driver confronts you, you should NOT:
try to let them pass.
try to get out of their way.
ignore gestures.
make eye contact.
9. When driving at night, you should use ________ when you can.
high beams
emergency flashers
indicator lights
low beams
10. If your vehicle is hydroplaning, you should:
put the vehicle in reverse.
stay off the brake.
apply the brakes.
speed up.
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TX CDL Doubles 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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