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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.
Rollovers happen when drivers:
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turn too slowly.
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brake too hard.
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turn too fast.
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stop too often.
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2.
Most heavy duty vehicles use ___ air brake systems for safety.
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triple
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dual
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single
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reduced
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3.
To know if your vehicle is equipped with ABS, look for:
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a yellow ABS malfunction lamps on the instrument panel.
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the ABS logo on the steering wheel.
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an ABS placard.
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the ABS shipping paper.
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4.
When going down a steep downgrade, you should primarily brake using:
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the service brakes.
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the emergency brake.
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the parking brake.
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the braking effect of the engine.
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5.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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shank of the kingpin.
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head of the kingpin.
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the brake camshaft.
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the electrical cord.
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6.
Exhaust system parts should NOT:
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rub against tires.
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rub against fuel system parts.
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be loose.
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All of the above.
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7.
You are driving a modern truck with a manual transmission. When going down a hill you should usually:
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use the same gear you would use to go up the hill.
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use a lower gear than would be required to go up the hill.
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downshift after your
speed has already built up.
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shift into neutral and coast.
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8.
The weight of a truck:
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has no effect on stopping distance.
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has an impact on stopping distance.
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is not as important as the vehicle's center of gravity in determining stopping distance.
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None of the above.
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9.
If a tire fails while you are driving, you should:
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brake as hard as possible.
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call your supervisor for instructions.
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stay off the brake
until your vehicle has slowed down.
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stop on the roadway if possible.
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10.
The trailer hand valve should be used:
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to check that the trailer emergency brakes are on.
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to check that the trailer is locked onto the tractor.
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to check that the fire extinguisher is charged.
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to test the trailer brakes.
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