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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Texas CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Texas CDL Manual. Take this practice test now to prepare for the actual TX CDL combination test!
1. If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
5, 50 and 500 feet
5, 25 and 50 feet
10, 100 and 200 feet
3, 15 and 45 feet
2. Antifreeze:
doesn't help the engine in any way.
helps the engine under hot conditions as well as cold conditions.
helps the engine only when the temperature is below freezing.
helps the engine only under hot conditions.
3. After coupling the trailer, begin raising the landing gear by using:
the low gear range.
the high gear range.
the electrical cord.
the crank handle.
4. You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
The brakes on the trailer wheels caused the skid in the first place.
You should use the service break instead.
The brakes on the trailer wheels will not respond.
You should use the emergency break instead.
5. The service line is also called:
carrier line or control line.
signal line or air line.
control line or signal line.
pressure line or signal line.
6. Air brakes use ________ to make the brakes work.
compressed oil
compressed gas cylinders
compressed gases
compressed air
7. Under a pressurized system, the radiator cap:
should be removed when the coolant is hot.
should always be cool.
should never be removed until the system has cooled.
should never be hot.
8. When you make a quick lane change, the crack-the-whip effect can:
make it harder to turn without skidding.
the trailer to swing wide to the left.
improve your traction.
turn the trailer over.
9. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
10. To avoid rollovers, you should drive slowly:
off ramps.
around corners.
on ramps.
All of the above.
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TX CDL Combination Test

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