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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.
Doubles and triples:
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can be stopped suddenly due to their weight.
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can't be turned suddenly.
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have a lower chance of skidding.
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can be turned suddently due to the low center of gravity.
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2.
Radial and bias-ply tires:
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should be used together.
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should be used together only during bad weather.
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should not be used together.
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should be used together only when driving in packed snow.
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3.
When you push in the red trailer air supply knob, this will:
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disconnect the electrical connector.
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disconnect the air lines from the trailer.
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open the emergency line shut-off valve at the rear of the last trailer.
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supply air to the emergency supply lines.
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4.
If your brakes fail on a steep mountain downgrade, you should:
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set the parking brake and park in an open area.
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decide what to do as soon as you know your brakes do not work.
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stay on the road and keep looking for the next available escape ramp.
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slow down until your vehicle comes to a complete stop.
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5.
Dollies with ABS are required to have a malfunction lamp:
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on the front.
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on the left side.
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on the rear.
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on the right side.
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6.
Containerized loads are used:
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when the cargo has been or will be carried by rail or ship.
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when the cargo exceeds the weight limit.
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when transporting liquids.
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when transporting explosives.
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7.
The tire load for each tire is stated:
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on the side of the tire.
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on the inside of the tire.
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on the tread of the tire.
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on the vehicle's operator manual.
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8.
Texting while operating a commercial motor vehicle is:
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acceptable if you are contacting your dispacther.
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illegal.
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only allowed at night.
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acceptable if you are contacting your supervisor.
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9.
Do NOT use the parking brakes:
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when you park for less than two hours.
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if the brakes are very hot.
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to test that they work.
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when you leave your vehicle.
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10.
If your brakes fail on a steep mountain downgrade, you should:
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change lanes after making sure there is enough room.
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leave the road immediately.
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use an escape ramp if it is available.
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go right if the shoulder is clear.
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